Dutch Research School of Theoretical Physics

ANNUAL REPORT 2007

Landelijke Onderzoekschool voor Theoretische Natuurkunde Dutch Research School of Theoretical Physics (DRSTP) Landelijke Onderzoekschool voor Theoretische Natuurkunde (LOTN)

Visiting address: Minnaert Building Leuvenlaan 4 3584 CE Utrecht

Postal address: P.O. Box 80.195 3508 TD Utrecht the Netherlands telephone: +31 30 253 5916 fax: +31 30 253 5937 e-mail: [email protected] website: http://www1.phys.uu.nl/drstp/ Preface

The Dutch Research School of Theoretical Physics (DRSTP) is a cooperation between the theoretical physics groups of six Dutch universities: University of Amsterdam (UvA), Vrije Universiteit Amsterdam (VUA), University of Groningen (RUG), Leiden University (UL), Radboud University Nijmegen (RU) and Utrecht University (UU, commissioner). In addition, there are several associated groups and individual re- searchers. Its main objectives are to implement a joint programme of graduate edu- cation in theoretical physics and to maintain and strengthen research in theoretical physics. On 31 December 2007, 73 PhD students were affiliated to the DRSTP, as well as 58 tenured and 44 non-tenured staff (postdocs). The research output led to 12 PhD dissertations and 296 academic publications. This annual report 2007 provides an overview of the educational and research activ- ities during 2007. The report also presents two research highlights written by staff members of the Research School. In addition, it offers factual information, such as a list of the participating staff, of the PhD students, a comprehensive list of publica- tions, as well as other relevant statistics. The annual report is not the only information that we make available throughout the year. We also publish a monthly newsletter and a yearly guide of our educational activities. Up-to-date information on the DRSTP is also readily available on internet at: http://www1.phys.uu.nl/drstp/. Finally, we should like to thank all of those who contributed to the Research School during this past year. prof. dr. B. de Wit prof. dr. K. Schoutens Scientific director Chair governing board

August 2008 4 Annual report 2007 Contents

1 The DRSTP in 2007 7

2 Scientific highlights 11

3 PhD programme 17 3.1 Educational programme ...... 17 3.1.1 DRSTP postgraduate courses (AIO/OIO schools) ...... 17 3.1.2 DRSTP Symposium Trends in Theory 2007 ...... 19 3.1.3 Guest lecturers ...... 19 3.2 PhD degrees and subsequent employment ...... 20 3.3 PhD degrees granted in the DRSTP in 2007 ...... 20 3.4 Other PhDs advised by DRSTP staff ...... 28 3.5 DRSTP PhD students (31-12-2007) ...... 28 3.6 Scientific and educational activities of PhD students (theme 1) . . . . 34 3.7 Scientific and educational activities of PhD students (theme 2) . . . . 41

4 Scientific staff (31-12-2007) 51 4.1 Permanent staff ...... 51 4.2 Temporary staff ...... 53 4.3 Associate members ...... 54

5 Academic publications 55 5.1 Theme 1: Particle physics, cosmology, quantum gravity and string theory 55 5.2 Theme 2: Quantum matter, quantum information, soft condensed mat- ter and biophysics ...... 62

6 Scientific activities 73 6.1 Theme 1: Particle physics, cosmology, quantum gravity and string theory 73 6.2 Theme 2: Quantum matter, quantum information, soft condensed mat- ter and biophysics ...... 87

7 Science-related activities 99 7.1 Professional publications ...... 99 7.2 Other publications ...... 99 7.3 Public lectures ...... 100 7.4 Other contributions ...... 101

8 Research funding 107 8.1 Personal grants ...... 107 8.2 FOM funding ...... 108 8.3 EU-networks ...... 112 8.4 ESF ...... 113 8.5 Other ...... 113

9 Organisation DRSTP 2007 115

10 Addresses 117

Appendix A Mission Statement 121

Appendix B Selection and supervision procedure of PhD students 124

Appendix C Postgraduate AIO/OIO schools 126

Appendix D Symposium Trends in Theory 2007 131

Appendix E National seminars 136

Appendix F Statistics 139 1 The DRSTP in 2007

The Netherlands has a long tradition in theoretical physics which involves research performed at university institutes, industrial laboratories, and government institu- tions. The strength of this research area is, for a large part, based on the unity of methods employed in a wide range of applications. This manifests itself both in sci- entific research and in academic education. To structure and coordinate the graduate education in theoretical physics, the Dutch Research School of Theoretical Physics (DRSTP) was accredited in 1994 by the Royal Netherlands Academy of Arts and Sciences (KNAW) and reaccredited in 1999 and 2004. The school is, at this moment, a cooperation between the theoretical physics groups of six Dutch universities: University of Amsterdam (UvA), Vrije Universiteit Amsterdam (VUA), University of Groningen (RUG), Leiden University (UL), Rad- boud University Nijmegen (RU) and Utrecht University (UU, commissioner). In ad- dition, there are several associated groups and individual researchers. The main objectives of the Dutch Research School of Theoretical Physics are to imple- ment a joint programme of graduate education in theoretical physics and to maintain and strengthen research in theoretical physics from a broad unifying perspective that exploits the interrelationships between different fields of theory. The DRSTP is based on the conviction that a joint venture of all the moderately sized local theory groups, each with its own profile, offers added value for the achievement of these objectives. The current version of the mission statement and a short description of the DRSTP organization can be found in appendix A.

The DRSTP graduate programme in 2007 As part of the research training, under supervision of a member-scientist of a par- ticipating university, the Research School guarantees a wide range of educational opportunities for its PhD students. These consist of postgraduate schools, advanced courses, seminars and topical courses in the Netherlands, and international experi- ence in the form of workshops, summer schools or extended research visits abroad. As in previous years the educational board published the educational guide with an overview of the regular advanced courses taught at the universities. In 2007 twelve students obtained their PhD. The average time between the start of the research and the date of the PhD exam is 49,5 months. Also in reaction to com- ments in the reaccreditation report of the ECOS (KNAW) the rules for the admission of students to the DRSTP are strictly applied. In this admission procedure, the so-called “agreement of education and guidance” (plan for training and supervision) plays a crucial role. The selection and admission procedure is described in appendix B. 8 Annual report 2007

The DRSTP research programme Theoretical physics is based on universal principles. New concepts often have a much wider validity than for the field where they were initially discovered, and methods of description developed in one field are often fruitful in another. Hence, theoretical physics is characterized by unity in diversity. The research programme of the DRSTP is organized according to two themes:

Theme 1: Particle physics, cosmology, quantum gravity and string theory. • Theme 2: Quantum matter, quantum information, soft condensed matter and • biophysics.

To give an impression of the variety of research topics, two highlights are presented in chapter 2. The specific content of the research programme depends on the respons- ible project leaders, on their creativity as well as their success in acquiring research funding from their home university, the Dutch research councils of NWO, or from international sources such as European Union programmes. The 2007 research output of DRSTP members presented in this annual report is presented according to the two research themes.

Trends in Theory 2007 Every two years the DRSTP Symposium Trends in Theory takes place. On 31 May and 1 June 2007 the symposium was held for the seventh time. This symposium is also part of the educational programme for the PhD students, who are encouraged to present a poster on this occasion. The symposium is an opportunity for the per- manent staff and postdoctoral fellows to meet and to get an overview of the recent developments in theoretical physics. Four members of the DRSTP advisory board attended the symposium. On the even- ing preceding the symposium the advisory board met with the DRSTP governing board. In appendix D more information about the symposium is given.

Professor Willy van Neerven (1947-2007) Willy van Neerven (associate professor at Leiden University and adjunct professor at VU Amsterdam) died suddenly on 15 February 2007. He had been in poor health for the past two years after suffering a stroke in January 2005. Nevertheless he con- tinued to go to the Lorentz Instituut on a regular basis to do research. He loved doing difficult calculations in quantum field theory that were of crucial importance for the precision analysis of experimental data from all major particle accelerators in the last decades. Willy was an active member of the DRSTP and taught at the first Theoretical High Energy Physics AIO-school at Beekbergen in 1987. He was also a scientific organizer of the school in 2001 and taught courses in the 1994 and 2003 schools. He enjoyed interacting with the students. He had a fantastic knowledge of quantum field theory and was happy to share this with colleagues and students.

Staff mutations in 2007 Dr. J.-S. Caux was appointed as associate professor at the Institute for Theoretical Physics (UvA) on 1 May 2007. 1. The DRSTP in 2007 9

After ending his adjunct professorship at Utrecht University (and with that his mem- bership of LOTN) in 2006, prof. dr. L.-F. Feiner (Philips) became an associated member of the DRSTP in 2007. Prof. dr. E.L.M.P. Laenen (NIKHEF) was appointed part-time professor at the In- stitute for Theoretical Physics (UvA) and the Institute for Theoretical Physics (UU) in 2007. His topic of research is: Quantum field theory and the phenomenology of elementary particles. Dr. T.A. Rijken (RU) retired per 1 November 2007. Dr. K.E. Schalm was appointed as associate professor in particle cosmology at Leiden University (UL) on 1 September 2007.

Inaugural lecture Dr. G.T. Barkema (UU/UL) delivered his inaugural lecture Theoretische fysica en de kennissamenleving at Leiden University on 19 January 2007. Dr. Barkema was appointed as adjunct professor at Leiden University as of March 2006.

Guest chairs In 2007 staff members and PhD students profited from the presence of world renowned physicists appointed on the guests chairs. Prof. dr. A.O. Caldeira (Universidade de Campinas, Brazil) occupied the Kramers Chair at Utrecht University. Prof. dr. S. Carlip (Univ. of California, Davis) occupied the Kramers Chair at Utrecht University. Prof. dr. T.W.B. Kibble (Imperial College London) occupied the Lorentz Chair at Leiden University. More information about their activities can be found in section 3.1.3.

Visiting professorships held by DRSTP staff H. van Beijeren (UU) was a visiting professor at UNSW@ADFA, Canberra, Australia and visiting fellow at ANU, Canberra, Australia (1 May - 1 July) and he was a re- search fellow with CNRS, at the Institut Henri Poincar´e,Paris, France (September - December).

Awards and distinctions F.A. Bais (UvA) was elected external faculty member of the Santa Fe Institute in Santa Fe, New Mexico, USA. E.A. Bergshoeff (RUG) was awarded the Nicolaas Muleriusstipendium 2006 by the University of Groningen. M.H. Ernst (emeritus UU) was awarded the Lars Onsager Medal for outstanding re- search in statistical physics, in particular kinetic theory. W. van Saarloos (UL) was elected Fellow of the American Physical Society.

Visiting scientists (long term) A.E. Allahverdyan (Yerevan) was a guest at the Institute for Theoretical Physics (UvA) from 1 November to 30 November. I. De Baetselier (University of Leuven) was a guest at the Centre for Theoretical 10 Annual report 2007

Physics (RUG) from 1 February to 1 July. A. Burinskii (Moscow) was a guest at the Institute for Theoretical Physics (UvA) from 1 November to 30 November. D. Gomez-Vergel (CSIC, Madrid) was a guest at the Institute for Theoretical Physics (UU) from 1 September to 15 November. P. Machado was a guest at the Institute for Theoretical Physics (UU) from 1 January to 1 July. S. Mahapatra (Utkal Univ., Bhubaneswar) was a guest at the Institute for Theoretical Physics (UU) on a NWO visitors grant from 16 April to 1 June 2007. K. Maharana (Utkal Univ., Bhubaneswar) was a guest at the Institute for Theoretical Physics (UU) on a NWO visitors grant from 16 April to 1 June 2007. S.I. Mukhin (Moscow Institute for Steel and Alloys) was a guest at the Instituut- Lorentz for Theoretical Physics (UL) from 6 January to 4 February. S. Panda (Harish-Chandra Research Institute, Allahabad, India) was a guest at the Centre for Theoretical Physics (RUG) from 4 September to 10 October.

This annual report is organized as follows. Chapter 2 contains two scientific highlights. Chapter 3 gives a description of the educational programme, short summaries of the PhD theses published in 2007, an overview of the scientific and educational activities of the PhD students affiliated to the DRSTP. An overview of the DRSTP scientific staff and associate members is given in chapter 4. The chapters 5, 6, 7 contain, respectively, the 2007 publications, talks and other presentations and science-related activities (public lectures, professional publications). Data on research funding are listed in chapter 8. 2 Scientific highlights

This chapter presents two highlights of theoretical research carried out by members of the Research School. One concerns work on indefinite Kac-Moody algebras and their implications for string theory and supergravity. This work belongs to theme 1 of the school and the contribution has been written by Eric Bergshoeff. A second highlight belongs to theme 2 and deals with fermionic quantum criticality. This contribution has been written by Jan Zaanen and Frank Kr¨uger.

The symmetries of string theory (Eric Bergshoeff, Centre for Theoretical Physics, University of Groningen)

Symmetries play an essential role in describing and understanding physical theories [1]. More symmetries give simpler but more powerful physical laws. For instance, the fact that the laws of mechanics are invariant under translations, means that we can apply the same laws of mechanics here at Earth as at the Moon and at other places in the Universe. The theory of symmetries has evolved into a special field in mathematics, called group theory. Symmetries have an even more dramatic impact on such modern theories as the Stand- ard Model of particle physics. In that case the interactions between the particles are completely determined by imposing certain symmetries. Symmetries also play a cru- cial role in describing string theory, the main contender for a quantum theory of gravity. The low energy limit of string theory is given by Einstein’s theory of gravity as coupled to matter endowed with an extra symmetry, called supersymmetry. Supergravity is often used as an extremely useful guideline for unraveling the properties of string theory. The search for supersymmetry is one of the main targets of the upcoming LHC experiment starting at CERN in 2008 [2]. The question remains whether supersymmetry is the only relevant symmetry of string theory and supergravity. It is well known that, after wrapping a number of spatial dimensions, supergravity re-emerges as the low-energy limit of compactified string theory but now endowed with a number of extra so-called “hidden symmetries”. So- far, these symmetries always belonged to the class of a finite number of symmetries which were classified a long time ago. The basic properties of these symmetries can be encoded by a diagram, consisting of a number of dots and lines between these dots. Such diagrams are called Dynkin diagrams. For instance, the exceptional E8 symmetries are encoded by the Dynkin diagram of Figure 2.1. These diagrams play the role of the Feynman diagrams of group theory in the sense that they encode well- defined rules to reproduce all the basic properties of the corresponding symmetries. 12 Annual report 2007

y

yyyyyyy

Figure 2.1: The Dynkin diagram of the E8 symmetries.

It has been conjectured by the group of P. West at King’s college (London) that for string theory the relevant symmetries are the so-called E11 symmetries with a Dynkin diagram given in Figure 2.2 [3]. This Dynkin diagram looks like the E8 Dynkin dia- gram of Figure 2.1 except that 3 more dots have been added at the right, indicated by a green color. Such diagrams do not occur in the usual classification of symmetries. The reason for this is that the Dynkin diagram of Figure 2.2 gives rise to an infinite number of symmetries. In itself, this is not a problem as long as one can rigorously define the infinite symmetries. In certain cases, this is indeed possible and math- ematicians have called such infinite number of symmetries Kac-Moody symmetries. For instance, the Dynkin diagram of Figure 2.3, which is obtained by adding only one dot to the Dynkin diagram of E8, corresponds to the so-called E9 Kac-Moody symmetries. The problem with the E11 symmetries is that for that case the math- ematicians sofar have not figured out how to define the infinite number of symmetries.

y

yyyyyyy yyy

Figure 2.2: The Dynkin diagram of the E11 symmetries.

Until recently, the E11 conjecture of West was a conjecture with not much calcula- tional support. This changed in the spring of 2007 when our group in Groningen, at the same time as the group of West, showed that group theory calculations based on E11 lead to a prediction of what kind of scalar potentials and cosmological constants can occur within a given supergravity theory [4]. This information is of immediate relevance for phenomenological applications and cosmological model building. In- triguingly, the predictions of E11 agreed with calculations performed by the group of de Wit at Utrecht university who had followed a rather different route using super- gravity techniques not making use of any E11 calculations [5]. 2. Scientific highlights 13

y

yyyyyyy yyyy

Figure 2.3: The Dynkin diagram of the E9 Kac-Moody symmetries.

The above developments have spurred a lot of renewed activity in investigating the conjectured occurrence of E11 symmetries in string theory. It is likely that to realize all E11 symmetries, and not just part of it, some major stumbling blocks have to be circumvented. One of them (and not the easiest one!) is to extend the electromag- netic duality of Maxwell’s theory to a gravitational duality of Einstein’s theory of gravity. It remains to be seen what new developments the future will bring us in this direction. For mathematicians, these exciting developments are a good occasion to re-try formulating a rigorous definition of the infinite E11 symmetries.

[1] See, for instance, Fearful Symmetry: the Search for Beauty in Modern Physics by A. Zee, Princeton University Press (2007), reprinted, ISBN: 0-691-00946-5.

[2] For a popular account of this search, see Supersymmetry: Unveiling the Ultimate Laws of Nature by G. Kane, Perseus Publishing (2000), ISBN: 0-7382-0489-7. [3] P. C. West, Class. Quant. Grav. 18 (2001) 4443 [arXiv:hep-th/0104081]. [4] F. Riccioni and P. West, JHEP 0707 (2007) 063 [arXiv:hepth/ 0705.0752]; E. Bergshoeff, I. De Baetselier and T. Nutma, JHEP 0709 (2007) 047 [arXiv:hep- th/0705.1304]. [5] See, e.g., B. de Wit, H. Nicolai and H. Samtleben, JHEP 0802 (2008) 044. 14 Annual report 2007

Fermionic quantum criticality: fermion statistics turning scale invariant (Jan Zaanen and Frank Kr¨uger,Instituut-Lorentz for Theoretical Physics, Leiden University)

We are made from a quantum-mechanical soup formed from quarks, electrons and so forth, but the classical matter on our human scale has entirely forgotten its quantum origin. The big world in which we live is just a radical emergence effect in many particle quantum physics. Are there alternative, more “quantum” forms of macro- scopic matter? Recently physicists got intrigued by the “quantum critical state”. This state is realized when a phase transition takes place at the absolute zero of temperature, driven by increasing quantum fluctuations turning one stable state of matter into another. At this transition the system cannot decide about its state and it becomes scale invariant: the quantum system looks the same regardless its scale and this has fascinating consequences. It became clear recently that the quantum critical state is quantum entangled on the macroscopic scale, and as form of matter it is capable of performing quantum computations [1]. Temperature is the mortal enemy of quantum coherence and at any finite temperature quantum critical matter behaves like a classical fluid. But this is a very strange fluid, as examplified by the re- cent demonstration that its flow properties relate via the string theoretical AdS-CFT correspondence to the traits of a gravitational black hole [2]. The principles governing emergence are so general that they transcend the quantum- classical divide. Emergent scale invariance is familiar from classical phase transitions like the one where water turns continuously in steam when pressure and temperature are high enough. But in quantum physics one also has to account for the organiz- ational principles embodied by quantum statistics stating that particles are either super-conformists (bosons) or hyper-individualists (fermions). Using the powerful Feynman path integrals it is easy to see that bosonic quantum matter is eventually governed by exactly the same emergence rules as classical matter, and the under- standing of quantum criticality is leaning heavily on this analogy. How different is fermionic matter! The path integral gets wrecked by the infamous fermion minus signs, stating that one has to deal with “negative probabilities”. This is as absurd as it sounds, while the mathematical solution of this problem is worth a million dollars from the Clay institute, since it turns out to be “NP hard” which is on the list of most important problems in mathematics. This mathematical paralysis is actually quite consequential for the human understanding of nature. The understanding of fermionic matter is entirely limited to the non-interacting Fermi- gas: the textbook story stating that the single particle quantum states have to be filled up using the Pauli principle until one reaches the Fermi energy. This Fermi gas surfaces everywhere in physics, be it the Dirac vacuum of the elementary particles or the Fermi liquid describing the electron systems in conventional metals like copper. Can fermionic matter be different? Here the strength of condensed matter physics comes into play: this discipline is facing an intellectual crisis because experiments demonstrate that there are many fermionic systems formed from electrons in solids that behave entirely differently from Fermi gasses. A famous example are the high-Tc superconductors, but more recently there is much interest in the particularly clear- 2. Scientific highlights 15 cut “heavy fermion” quantum critical metals [3]. These metals show a transition to a magnetically ordered state at a low temperature, which can be driven to zero tem- perature by applying pressure or a magnetic field. At this quantum phase transition one finds all the signs of the scale invariance associated with quantum criticality, but this critical state is obviously fermionic: the Fermi energy is a scale and in order to be critical this scale has to disappear. The Fermi energy is rooted in the quantum zero point motions of the low energy quasi-particles. To let the Fermi energy disappear, the mass of the quasi-particles has to tend to infinity upon approaching the critical point and this is precisely what is found in the experiments. The theorists were standing empty handed facing this phenomenon - to understand quantum criticality one needs path integrals but these are wrecked by the fermion signs. However, we found serendipity on our way in Leiden and we discovered a key to unravel this mystery: this key has an incarnation as a beautiful picture (Figure 2.4). Already in 1991 Ceperley introduced an alternative formulation for the fermion path integral that is free of fermion signs [4], but this was lying dormant because it involves an extra structure of constraints coding for the fermion statistics that seemed totally incomprehensible. These constraints have to do with the nodal structure of fermionic wavefunctions. When one moves around in the space spanned by the coordinates of all particles (configuration space) the wavefunction will change sign frequently and the nodal surface is the hypersurface in configuration space where the sign changes take place (see Figure 2.4). Ceperley’s path integral is stating that the fermions be- have like bosons as long as they do not cross the nodal surface, while the geometrical and topological properties of this surface are in turn determined by the nature of the fermion system. In the case of the Fermi-liquid this nodal surface is a smooth manifold having as consequence that the fermions confine each other in “nodal cells”. When quantum particles are locked up in small boxes their zero point energy goes up and this exactly the meaning of the Fermi-energy in this language. It follows that in order for the fermion system to be quantum critical, the nodal pockets should occur in all possible sizes, and the nodal surface has to acquire geometrical scale invariance: it has to turn into a fractal! Then we found luck on our side. Some 50 years ago the famous Feynman wrote down an Ansatz wave function describing the quantum version of the classical hydro- dynamical phenomenon of back flow: when one particle moves in one direction, to make space an infinity of other particles flow in the opposite direction. We decided to have a look at the nodal structure of a fermionic backflow system and to our surprise the computer produced the figure - quantitative analysis shows that this is indeed a fractal. Moreover, it is possible to tune backflow wavefunctions from a non-critical Fermi-liquid- to the critical regime and we managed to explicitly compute the quasi- particle mass divergence which is lighting up in the experiments [5]. The significance of our discovery transcends its context. That the Ceperley path integral is capable of describing non Fermi-liquid states is an eye opener, delivering proof of principle that it is a mathematically tractable machine capable of producing surprises in physics. The progress we have made in the last few months in decyphering the workings of the Ceperley method for other problems gives further support to our perception of its great potential to corner the fermion sign problem, at least in so far 16 Annual report 2007 it is consequential for physics.

Figure 2.4: A cut through the fractal nodal hypersurface associated with Feynman’s fermionic backflow wavefunction in two dimensional space, representing the merger of scale invariance and Fermi-Dirac statistics. This cut is obtained by fixing the positions of all particles except one (green dots) at random positions, keeping track of the positive (blue) or negative (red) sign of the many particle wavefunction when a test particle (yellow dot) is moved around in space. The nodal surface resides where the color changes take place. In Ceperley’s constrained path integral the nodal surface enters as an “impenetrable wall” for boson-like particles and a fractal geometry of the nodal surface is a necessary condition for the fermion system to be quantum critical.

[1] G. Vidal et al., Entanglement in quantum critical phenomena, Phys. Rev. Lett. 90, 227902 (2003). [2] J. Zaanen, Theoretical physics - a black hole full of answers, Nature 448, 1000 (2007). [3] J. Zaanen, Fermionic quantum criticality: the unchartered sign worlds, Science 319, 1205 (2008). [4] D.M. Ceperley, Fermion Nodes, J. Stat. Phys. 63, 1237 (1991). [5] F. Kr¨ugerand J. Zaanen, Fermionic quantum criticality and the fractal nodal surface, submitted to Nature Physics (2008). 3 PhD programme

This chapter provides an overview of the educational programme and of the PhD de- grees granted in 2007. Research projects of current PhD students and data on their scientific and educational activities in 2007 are given.

The DRSTP offers a joint programme of graduate education leading to a PhD. The educational programme is based in part on the regular advanced courses, seminars and topical courses offered at the participating universities. The DRSTP organizes at least two postgraduate schools every year. Furthermore, students can gain inter- national experience by attending (international) workshops or summer schools and, in certain cases, by making extended research visits abroad. The governing board is advised on educational matters by the educational board. Regular advanced courses at the universities are published in a nationwide survey at the beginning of each aca- demic year. The governing board of the DRSTP decides on admission of individual PhD students and monitors their progress. The affiliation of students is based on the ‘agreement of education and guidance’ (plan for training and supervision), drawn between each in- dividual student and his/her advisor(s). This document is submitted to the governing board before a decision is taken about the formal affiliation. An extended description of the selection and supervision procedure is presented in appendix B of this annual report. On 31 December 2007 seventy-three (73) PhD students were affiliated with the DRSTP. Twelve (12) PhD students obtained their PhD in 2007.

3.1 Educational programme

3.1.1 DRSTP postgraduate courses (AIO/OIO schools) The following courses were held in 2007:

Theoretical High Energy Physics (THEP) The DRSTP Postgraduate Course (AIO/OIO school) Theoretical High Energy Phys- ics was held from 29 January to 9 February 2007 in Brazil in cooperation with the Jorge Andr´eSwieca Summer School and the Instituto de F´ısicaTe´orica (IFT/UNESP), S˜aoPaulo, Brazil. The first week took place in hotel Le˜aoda Montanha (Campos do Jord˜ao), the venue of the second week was the Instituto de F´ısica Te´oricain S˜aoPaulo, Brazil. Scientific organizers from the DRSTP were J. Koch (NIKHEF/UvA) and K. Skenderis (UvA). Scientific organizers from Brazil were N. Berkovits (IFT/UNESP, S˜aoPaulo), G. Burdman (USP, S˜aoPaulo), M. Gandelman 18 Annual report 2007

(UFRJ, Rio de Janeiro) and G. Krein (IFT/UNESP, S˜aoPaulo). The program in- cluded the following lectures (the number of lecture hours is given in parentheses):

Week 1: 29 January - 2 February R. Forty (CERN): Physics challenges of the LHC (3) Y. Nomura (Berkeley): Beyond the standard model (5) H. Ooguri (Caltech): Topological string theory (5) T. Plehn (Munich & Edinburgh): Collider phenomenology (5) K. Skenderis (UvA): Introduction to AdS-CFT (5) G. ’t Hooft (UU): Feynman rules and unitarity (5) J. Takahashi (UNICAMP): Relativistic heavy ions: probing the big bang at the LHC (2,5)

Week 2: 5 February - 9 February B. de Wit (UU): Entropy of BPS black holes (10) J. Smit (UvA/UU): Finite-temperature field theory (10)

In the first week there was a broad program covering both abstract theory and ex- perimental particle physics. At the end of each day (except on Friday) a one hour discussion session was held in which all lecturers participated. In the second week the program consisted of two lecture courses of 10 hours each. In addition to these lecture courses, daily discussion/problem sessions were held in the afternoon (8 hours in total). In the second week seminars were given by G. ’t Hooft (UU) entitled: An instability in the baryonic string (5 February) and S.P. Sorella (Rio de Janeiro) entitled: Issues on the quantization of Yang-Mills theories (8 February). The other evening presentations in the school were given by the PhD students.

Eighteen (18) people participated. Thirteen (13) of them were from the Netherlands, three (3) participants came from Belgium (KU Leuven), one (1) from London (Imper- ial College) and one (1) from the USA (Santa Cruz). In the first week (overlapping with the Swieca school), in addition to the eighteen (18) people registered through the DRSTP, an additional 110 people participated. Almost all of them came from Brazil. In the second week (at the Instituto de F´ısicaTe´oricain S˜aoPaulo) about eight (8) Brazilian PhD students participated in the activities. Further information is given in appendix C.

Statistical Physics and Theory of Condensed Matter (SPTCM) The DRSTP Postgraduate Course (AIO/OIO school) Statistical Physics and Theory of Condensed Matter was held from 23-27 April 2007 in Hotel & Conference Center De Bergse Bossen, Driebergen. The programme was organized by J. van den Brink (UL) and R. van Roij (UU) and included the following lectures (4,5 hours each): J.-S. Caux (UvA): Spin chains and 1D Bose gases: from integrability to dynamics H. Stoof (UU): Ultracold fermions K. Storm (UL): Statistical physics of biopolymers and membranes 3. PhD programme 19

R. van Roij (UU): From liquids and electrolytes to colloidal suspensions In addition to these lecture courses, daily discussion/problem sessions were held in the afternoon (2,5 hours for each lecture course). An evening seminar (25 April) was given by G. van Ginkel (Debye Institute, UU) entitled: The position of Prof. Peter Debye in Nazi Germany in the period 1935 - 1940: an investigation of historical sources. The other evening presentations (10 minutes) were given by the PhD students. Twenty-five (25) students participated. All participants were from the Netherlands. Further information is given in appendix C.

3.1.2 DRSTP Symposium Trends in Theory 2007 The 7th biennial DRSTP Symposium Trends in Theory 2007 was held from 31 May-1 June 2007 in Conference Center De Bron, Dalfsen, the Netherlands. One hundred and eight (108) people participated. The programme included the following lectures (40 minutes each):

G. Arutyunov (UU): In quest for the S-matrix of AdS/CFT G. Bauer (TU Delft): Spin-transfer torques and spin dynamics in nanostructures A. Fasolino (RU Nijmegen/UvA): Graphene between hard and soft matter J. Fr¨ohlich (ETH Z¨urich): Atomism and quantization V. Icke (UL): Radiation hydrodynamics in the universe E. Laenen (NIKHEF/UU): Theory for LHC M. Mostovoy (RUG): PT-symmetry breaking in solids: magnetically induced ferro- electricity D. Nelson (Harvard): Neutral mutations and gene surfing in microorganisms K. Schalm (UvA): Searching for signatures of strings R. van Roij (UU): Suspensions of charged colloids: in bulk and near oil-water inter- faces

In addition to these lectures, poster presentations were held on both days. Forty- eight (48) posters were presented. B.C. van Rees (UvA) won this year’s poster prize entitled: Wormholes in 2+1 dimensions. A panel discussion was held on 31 May about: String theory and quantum gravity with L. Smolin (PI, Waterloo) and E. Verlinde (UvA), moderated by S. Bais (UvA). Further information is given in appendix D.

3.1.3 Guest lecturers Prof. dr. A.O. Caldeira (Universidade de Campinas, Brazil) occupied the Kramers Chair at Utrecht University from 1 April 2007 to 1 July 2007. He taught a lecture course entitled Macroscopic quantum phenomena and quantum dissipation. Prof. dr. S. Carlip (Univ. of California, Davis) occupied the Kramers Chair at Utrecht University from 1 September 2007 to 1 January 2008. He taught a lecture course entitled Introduction to quantum gravity. Prof. dr. T.W.B. Kibble (Imperial College London) occupied the Lorentz Chair at 20 Annual report 2007

Leiden University from 1 December 2006 to 31 January 2007. He taught a lecture course entitled Spontaneous symmetry breaking and topological defects.

3.2 PhD degrees and subsequent employment

In 2007 twelve (12) PhD students received their PhD degree. Seven (7) of them accepted postdoctoral positions (in Canada, USA, Belgium, UK and Iceland), three (3) a position at a commercial company, one (1) a research position not related to theoretical physics and one (1) a position as a high school teacher. More information on career moves of former PhD students during the last six years can be found in appendix F.

3.3 PhD degrees granted in the DRSTP in 2007

In this section a short summary of the PhD theses published in 2007 is given. The summaries are written by the students themselves.

Benedetti, D. (UU) thesis title: Quantum gravity from simplices: analytical investigations of causal dy- namical triangulations advisor: prof. dr. R. Loll date: 11 June 2007 present position: postdoctoral fellow, Perimeter Institute, Waterloo, Canada

A potentially powerful approach to quantum gravity has been developed over the last few years under the name of Causal Dynamical Triangulations. Although these models can be solved exactly in a variety of ways in the case of pure gravity in (1+1) dimensions, it is difficult to extend any of the analytical treatments to the case of higher dimensions and/or to that of matter coupling. The aim of this thesis is to try to take a small step beyond this impasse. After re- viewing in Chapter 1 the methods and the results of causal dynamical triangulations, we proceed in the next two chapters to illustrate in detail two original pieces of work which both represent a small step away from the special case of pure gravity in two dimensions. In Chapter 2 we tackle the problem of coupling matter to causal dynamical triangu- lations in two dimensions. To fix a starting point we choose one of the simplest, and certainly the most notorious, matter fields on a lattice, the Ising model. We show how an old method of investigation for spin systems on a lattice, the high- and low- temperature expansion, can be applied on the dynamical lattice represented by the triangulation. The application is not trivial as it requires an ensemble average over the lattices for the graphs appearing in the expansion, but we will develop a scheme that allows the computation of such averages. The method is quite general and can in principle be used for other kinds of matter models. The work presented in Chapter 3 goes into the realm of higher dimensions. We introduce a particular model of three-dimensional causal dynamical triangulations 3. PhD programme 21 and show that it can be solved in an asymptotic limit and a continuum quantum Hamiltonian is found. This is an important step in the understanding of these kinds of models, because this is the first case in which, for a dimension larger than two, a continuum limit has been obtained analytically, although many things remain to be understood and some approximations still removed. Together, the works presented in Chapter 2 and 3 constitute an advance in the analyt- ical understanding of causal dynamical triangulations and have the appealing feature of indicating directions for further development.

Bomhof, C.J. (VUA) thesis title: Azimuthal spin asymmetries in hadronic processes advisor: prof. dr. P.J.G. Mulders date: 1 October 2007 present position: research scientist, ASML, Veldhoven, the Netherlands

This thesis deals with the partonic structure of protons (or any other hadrons), the nuclei of hydrogen atoms. In the constituent quark model the proton is described as a collection of three quarks (two up and one down quark). This description is only suited to explain global quantum numbers of the proton. When studying the proton into greater detail, typically done through high energy scattering experiments, one uncovers a much richer structure. In fact, the proton is more like a boiling see where quark-antiquark pairs and gluons (the particles that establish the bonding between the quarks) are created and annihilated continuously. The down side of this observation (or, stated differently, the up side) is that this makes the study of the proton’s momentum and/or spin more difficult and more in- teresting. The puzzle of how these quantities arise from the dynamics of the partons is still today not fully understood. The spin structure is investigated through the study of polarized scattering processes. In particular for single spin asymmetries, where only one particle in the scattering process is polarized one is sensitive to gluon exchanges between partons from different hadrons that are involved in the high-energy scattering process. In this PhD study and described in this thesis, a systematic way of including all these gluon interactions was developed. In contrast to the simple parton description, this new formalism takes the full (gauge invariance) properties of the underlying quantum field theory into ac- count. For several important hadronic scattering processes we have used this new framework to make predictions, which in several cases deviate from the more naive approach followed up to now. de Vroome, M. (UU) thesis title: N=2 supersymmetric theories, dyonic charges and instantons advisor: prof. dr. B. de Wit co-advisor: dr. S. Vandoren date: 18 June 2007 present position: high school teacher, Weesp, the Netherlands 22 Annual report 2007

In the first part of this thesis we give an introduction to electric-magnetic duality and N=2 supersymmetry. After that we describe type II string theory instantons in the supergravity approximation. These instantons correspond to D-branes and NS- fivebranes wrapping non-vanishing cycles in the internal Calabi-Yau manifold. In the last chapter, we construct N=2 supersymmetric gauge theories involving both electric and magnetic (dyonic) charges. In these systems the electric-magnetic duality struc- ture of the ungauged theories is preserved.

Ellenbroek, W.G. (UL) thesis title: Response of granular media near the jamming transition advisor: prof. dr. ir. W. van Saarloos co-advisor: dr. M.L. van Hecke date: 14 June 2007 present position: postdoctoral fellow, University of Pennsylvania, USA

Many disordered materials display a so-called jamming transition between solid-like and fluid-like states. In this thesis, we investigate jamming in granular media by studying granular packings at various distances from the transition. In numerical model systems of spherical particles, the jamming transition has many features of a critical transition. Using the linear response of such packings to external per- turbations, we shed new light on their critical behavior. We analyze various scaling relations in terms of the non-affine deformations of the packing, and identify a diver- ging length scale that determines beyond what scale these systems can be treated as a continuum. This length scale and various other properties are determined primarily by the number of contacts between grains in the system. In the second half of the thesis we investigate force networks in granular media using the recently developed Force Network Ensemble. We discuss the analytical properties of the ensemble, and apply it to study granular media under shear stress, identifying upper bounds on the shear stress that cohesionless granular media can sustain.

Hagemans, R.L. (UvA) thesis title: Dynamics of Heisenberg spin chains advisor: prof. dr. K. Schoutens date: 12 April 2007 present position: associate, Barclays Capital, Investment Banking, Barclays Bank, Londen, UK

1 In the thesis I discuss the dynamics of the one-dimensional antiferromagnetic spin- 2 isotropic and anisotropic Heisenberg model. First I discuss the Bethe Ansatz solution of the model, which has been known since 1931. This solution expresses the eigenval- ues of the Hamiltonian in terms of a set of coupled nonlinear equations known as the Bethe equations. Solving these equations therefore gives the energy spectrum and, as a consequence, the partition function of the system, thus enabling the exact derivation of thermodynamic properties. Finding the roots of the equations is straightforward numerically in many cases, where these roots are real. In the case of complex roots, however, numerical 3. PhD programme 23 solution methods run into trouble. To avoid this, a conjecture known as the string hypothesis is often employed, which reduces the equations to real equations. While this conjecture is plausible, it is also known to yield results that are only approxim- ately correct. Using this approximate result as an initial guess, I construct a method to find the exact solution in the complex plane of the roots of the Bethe equations. I also address the case for singular states, about which confusion had arisen in the literature. I show that singular states are valid solutions of the Bethe equations and represent bona fide eigenstates of the Hamiltonian. Working from the Algebraic Bethe Ansatz and the determinant formulas for form factors found by Maillet and others, I derive determinant formulas for form factors for string-like solutions. The dynamical spin structure factor, which is proportional to neutron-scattering intensities, can be expressed in terms of a sum over form factors over all states in the Hilbert space. We present a numerical algorithm for finding the most important contributions to this sum, thus making it possible to approximate it to high precision. This approximation is well-controlled due to the existence of sum rules. I present a large number of results, plotting the dynamic structure factor as a function of energy and momentum. In the thermodynamic limit, a higher symmetry appears in the model, leading to a systematic picture of spinon excitations. Conjecturing completeness of the spinon states, one can identify 2-spinon, 4-spinon and higher contributions to the dynamical structure factor. These contributions are expected to decrease with spinon number. The 2-spinon-contribution found this way has been calculated; the four-spinon con- tribution is numerically tractable as well. Due to an incorrect understanding of the four-spinon-continuum, results earlier published strongly underestimated this four- spinon contribution, casting doubt on the validity of the spinon approach. We show that the correct figure lies mich higher and is in fact in line with expectations from a spinon-series point of view. Another approach to the Heisenberg chain in the thermodynamic limit builds on bo- sonisation, which links the spin chain excitations at low momentum to a conformal field theory. In this approach the dynamical structure factor is a very easy object to calculate. Here the challenge is to correctly identify the operators that modify the free-boson theory, which is correct only in the zero-momentum limit. These op- erators can be inferred from symmetry considerations, and numerical results for the dynamical structure factor from the Bethe Ansatz approach help establish the cor- rect operators and coefficients. The subsequent modifications of the high-energy tail and peak width of the basic delta-peak free-boson lineshape are compared to Bethe Ansatz results.

Koers, H.B.J. (UvA) thesis title: The astrophysical herald. Neutrinos as probes for particle physics and astronomy advisors: prof. dr. K.J.F. Gaemers and prof. dr. R.A.M.J. Wijers date: 21 September 2007 present position: postdoctoral fellow, Facult´ede Sciences, Physique Th´eorique,Uni- versit´eLibre de Bruxelles, Belgium 24 Annual report 2007

This thesis is concerned with cosmological models that arise in low-energy string the- ory and coset models. The first part of this thesis provides a basic introduction to cosmology and bosonic string theory. After this, the gravitational theory that arises in low-energy string theory is developed and discussed. The cosmological implications of this theory are investigated, with emphasis on the relation to the universe we inhabit. This general account is followed by a detailed review of some known models in the literature and a discussion on the possibility of finding a de Sitter solution. The second part of this thesis considers coset models, which provide a systematic way to find background fields that are valid solutions in full (as opposed to low-energy) string theory. The construction of such a model using the gauged Wess-Zumino- Witten action is presented. After this, a general way to describe propagation of scalar particles on the coset space is developed. The last chapter focuses on coset models that yield spacetimes with an interesting cosmological interpretation. A well- known example of such a model is the Nappi-Witten universe, which is analyzed in detail using the techniques that were discussed.

Lazopoulos, A. (RU) thesis title: QCD and QMC: developments in perturbative quantum chromo-dynamics and quasi Monte-Carlo advisor: prof. dr. R.H.P. Kleiss date: 26 March 2007 present position: postdoctoral fellow, Department of Physics and Astronomy, Univer- sity of Hawaii, Honolulu, Hawaii, USA

In this thesis my work on three quite different problems within the field of multi- particle perturbative calculations is presented. The main issues approached here are: the computational complexity of NLO calculations, Monte Carlo and Quasi-Monte Carlo integration methods and error estimates therein, and the progress in the level of analytical understanding of QCD–like theories using the recently advocated on- shell recursion relations. In chapter 2 methods for counting Feynman diagrams with loops for theories with bosonic particles and vertices with an arbitrary amount of legs are presented. Feyn- man diagrams are counted with and without symmetry factors and asymptotic results for one and two loops are given. The computational complexity of the Caravaglios- Moretti algorithm in the loop level with effective vertices is cited, and a comparison of that algorithm with the ordinary diagram per diagram approach is presented. A method for calculating the error in the Quasi-Monte Carlo method for numerical integration is presented in chapter 3. An estimator for the error is suggested there, based on the underlying assumption that the Quasi point-set is a typical member of the ensemble of similar point-sets that share the property of having the same degree of uniformity, as measured by a particular Diaphony. The estimator is analyzed for a number of test-functions in various dimensions and is demonstrated to perform bet- ter than the ordinary, pseudo-random estimator. The latter is shown to consistently underestimate the error, as expected. A number of modifications are discussed that can be used to reduce the relevant computational. 3. PhD programme 25

In chapter 4 a fully diagrammatic proof of a recently advocated on-shell recursion re- lation for tree-level amplitudes involving gluons, is presented. The recurrence relation was first suggested by R. Britto, B. Feng, C. Cachazo and proven by these authors and E.Witten. It decomposes any on-shell n-point amplitude in on-shell amplitudes with a smaller number of legs and complexified momenta. The analysis presented here is based on a direct diagrammatic correspondence of Feynman diagrams with terms in a BCFW decomposition, employing a particular (but commonly seen) choice of axial vectors for the polarization vectors of the external gluons in the axial gauge. It is shown that, within this choice of axial vectors, the BCFW decomposition can be reorganized in terms of Feynman diagrams.

Leurs, B.W.A. (UL) thesis title: Non-Abelian gauge theories: analogies in condensed matter systems advisor: prof. dr. J. Zaanen date: 12 September 2007 present position: junior consultant/researcher, Asia Education Foundation, Univer- sity of Melbourne, Australia

This thesis discusses typical examples of how structures associated with non-Abelian gauge theories can emerge in a non-obvious way in condensed matter systems. The first aspect is how parallel transport structures can be understood in the context of transport of spins by electromagnetic fields. This discussion can give a mean to un- derstand how one can attempt to understand quark-gluon plasmas.

Romans, M.W.J. (UU) thesis title: Dressed molecules in atomic quantum gases advisor: prof. dr. ir. H.T.C. Stoof date: 7 February 2007 present occupation: consultant, Alten Nederland Consulting and Engineering, Cap- pelle a/d IJssel, the Netherlands

The use of Feshbach resonances in the field of ultracold gases has received a lot of attention recently. In first instance it was realized that these resonances can be used to alter the interaction strength in an atomic gas, by means of tuning an external magnetic field. Furthermore, by sweeping the magnetic field from one side of the resonance to the other, a degenerate gas of bosonic molecules can be created, a signi- ficant accomplishment. By making the interactions between fermionic atoms strongly attractive, a fermionic superfluid was recently made, a feat that has drawn a lot of attention in the physics community and from the media. We present work that describes these many-particle systems near a Feshbach resonance in a comprehensive way by using the concept of dressed molecules. These dressed molecules are essentially two-particle states that are a superposition of a tightly bound bare molecule, and two unbound bare atoms. This description reduces to the correct paired wave-function in the two-body limit. Moreover it gives a physically correct description of all the phenomena mentioned above: the Bose-condensation of a gas near a Feshbach reson- ance, that contains molecules, is more correctly interpreted as a Bose-condensation of 26 Annual report 2007 dressed molecules. The fermionic superfluid contains a condensate of bosonic pairs, normally called Cooper pairs, that can be understood as the dressed molecules. For the latter case, the dressed-molecule picture also gives an elegant characterization of the crossover between a Bose condensate of pure molecules on one side of the reson- ance, to a fermionic Bardeen-Cooper-Schrieffer superfluid on the other side. Then, the dressed molecules change continuously from being mostly a bare molecule, to being mostly a loose pair of two atoms. It is clear that the nature of the dressed molecules is much determined by the probability for it to be in the bare-molecular state. This probability we denote with a single parameter Z. We present various ways of calculating it, and study how it affects the macroscopic physics. van Riet, T.M. (RUG) thesis title: Cosmic acceleration in Kaluza-Klein supergravity advisor: prof. dr. E.A. Bergshoeff date: 28 September 2007 present position: postdoctoral fellow, University of Madison, Wisconsin, USA

String theory is one of the most promising attempts in constructing a consistent quantum theory of gravity and other forces in Nature. The rough idea behind string theory is fairly simple, there are vibrating strings and the different vibrational modes give rise to many particles and forces. The mathematical construction of the the- ory is complicated and unfinished, but perturbatively we have a good description of string theory. The full non-pertubative description is still to be formulated. In the second half of the nineties new insights have seen the daylight in the understanding of the non-pertubative formulation of string theory that was dubbed M-theory. For instance, it became clear that there must not only be strings but also membranes and even higher dimensional objects, called branes in short. Since the last ten years of string theory (or M-theory)-research is a growing interest that lies outside of the mathematical formulation of the theory but more in the phenomenological aspects of string theory. This comes from the realization that if string theory describes our world it should account for the low-energy phenomena today, which include particle physics on a small scale and cosmology on a large scale. This thesis concerns the second part, the relation between string theory and cosmology. van Wezel, J. (UL) thesis title: Quantum mechanics and the big world: order, broken symmetry and co- herence in quantum many-body systems advisors: prof. dr. J. van den Brink and prof. dr. J. Zaanen date: 4 April 2007 present position: junior research fellow, Homerton College, Cambridge, United King- dom

Quantum mechanics is one of the most successful physical theories of the last century. It explains physical phenomena from the smallest to the largest lengthscales. Despite this triumph, quantum mechanics is often perceived as a mysterious theory, involving superposition states that are alien to our everyday Big World. The construction of a 3. PhD programme 27 future quantum computer relies on our ability to manipulate quantum superposition states in qubits. In this thesis it is shown that these qubits can be subtly influenced by the physics associated with spontaneous symmetry breaking. This process destroys the quantum nature of the qubit and renders it useless for quantum computation. An even more fundamental problem with quantum superpositions is that they cannot be reconciled with the theory of general relativity. In the end of this thesis a model is proposed which describes the effective, deteriorating, influence of gravity on quantum states, thus suggesting a path toward the demise of quantum mechanics in the big world.

Westra, W. (UU) thesis title: Topology change and the emergence of geometry in two dimensional causal quantum gravity advisor: prof. dr. R. Loll date: 8 October 2007 present position: postdoctoral fellow, Science Institute, University of Iceland, Reyk- javik, Iceland

Despite many attempts, gravity has vigorously resisted a unification with the laws of quantum mechanics. Besides a plethora of technical issues, one is also faced with many interesting conceptual problems. The study of quantum gravity in lower dimensional models ameliorates the technical difficulties while still preserving some of the con- ceptually fascinating characteristics of quantum gravity. In this thesis we analyze a very simple model of two dimensional quantum gravity. Although a rather extreme simplification of four dimensional quantum gravity, many of the fundamental issues are still relevant. The first fundamental aspect where we make a contribution is the problem of topology change of space. Particularly, we present an exactly solvable model which shows that it is possible to incorporate spatial topology changes in the path integral rigorously. We show that if the change in topology is accompanied by a coupling constant it is possible to evaluate the path integral to all orders in the coupling and that the res- ult can be viewed as a hybrid between causal and Euclidian dynamical triangulation models. The second conceptual topic we cover is the emergence of geometry from a background independent formulation of quantum gravity. We show that a classical geometry with constant negative curvature emerges from a path integral over noncompact manifolds. No initial singularity is present, so the model naturally is naturally compatible with the Hartle Hawking boundary condition. Furthermore, we demonstrate that under certain conditions the superimposed quantum fluctuations are small! The model is an interesting example where a classical background emerges from background inde- pendent quantum gravity. To conclude, we tackle the problem of spacetime topology change. Although we are not able to completely solve the path integral over all manifolds with arbitrary to- pology, we do obtain some results that indicate that such a path integral might be consistent, provided suitable causality restrictions are imposed. As a first step we extend the existing formalism of causal dynamical triangulations by a perturbative 28 Annual report 2007 computation of amplitudes that include manifolds up to genus two. Further a toy model is presented where we make the approximation that the holes in the manifold are infinitesimally small. This simplification allows us perform an explicit sum over all genera and analyze the continuum limit exactly. Remarkably, the presence of the infinitesimal wormholes leads to a decrease in the effective cosmological constant, re- miniscent of the suppression mechanism considered by Coleman and others in the four-dimensional Euclidean path integral.

3.4 Other PhDs advised by DRSTP staff

Dijkstra, T. (NIKHEF) thesis title: Supersymmetric standard model spectra from RCFT orientifolds advisor: prof. dr. A.N.J.J. Schellekens date: Nijmegen, 11 June 2007 present position: financial analist, RABO Bank, the Netherlands

Fuster, A. (NIKHEF) thesis title: Kundt spacetimes in general relativity and supergravity advisor: prof. dr. J.W. van Holten date: VU Amsterdam, 6 December 2007 present position: assistant prof. dr. ir. ter Haar Romeny, Divisie Biomedical Imaging & Modeling, University of Technology Eindhoven, the Netherlands

Sulkowski, P. (UvA) thesis title: Calabi-Yau crystals in topological string theory advisor: prof. dr. R.H. Dijkgraaf co-advisor: Dr hab. Jacek Pawelczyk, professor University of Warsaw date: Warsaw, 22 June 2007 present position: postdoctoral fellow, Faculty of Physics, Warsaw University, Poland

3.5 DRSTP PhD students (31-12-2007)

This section gives an overview of the PhD students affiliated to the DRSTP on 31 December 2007. The projects are chronologically ordered according to starting date. The research themes mentioned refer to particle physics, cosmology, quantum gravity and string theory (theme 1) and quantum matter, quantum information, soft con- densed matter and biophysics (theme 2). Note that the distinction between “aio” and “oio” is somewhat artificial as the various universities do not apply the same criteria.

University of Amsterdam (UvA)

Cheng, M.C.-N. (oio) as of 1 September 2003 with J. de Boer and K. Skenderis. • project: various aspects of quantum gravity, holography and the physics of black holes (theme 1). 3. PhD programme 29

van der Meulen, M.P. (oio) as of 1 October 2003 with J. Smit. • project: applications of field-theoretic methods to the physics of the early uni- verse (theme 1).

Kampmeijer, L. (oio) as of 1 November 2003 with F.A. Bais. • project: monopoles with non-Abelian charges, hidden symmetry and confine- ment (theme 1).

Galistu, G. (oio) as of 1 December 2003 with A.M.M. Pruisken. • project: experimental determination of electronic structure of low-dimensio- nal electron systems, with emphasis on quantum critical phenomena of a two- dimensional electron gas in the quantum Hall regime (theme 2).

Manschot, J. (oio) as of 1 March 2004 with E.P. Verlinde. • project: the study of the connection between gravity and gauge theory using string theory, in particular with applications to cosmology (theme 1).

Arsiwalla, X.D. (oio) as of 1 November 2004 with E.P. Verlinde. • project: development of non-perturbative methods in string-theory, in particular topological strings and black holes (theme 1).

Hollands, L. (aio) as of 1 November 2004 with R.H. Dijkgraaf. • project: the study of mathematical aspects of string theory, in particular topo- logical strings (theme 1).

Messamah, I. (oio) as of 1 November 2004 with J. de Boer. • project: issues in quantum gravity using non-perturbative string theory, in par- ticular the quantum physics of black holes, their formation and Hawking ra- diation, cosmological models and the nature of quantum space-time geometry (theme 1).

Hoogeveen, J. (oio) as of 1 September 2005 with R.H. Dijkgraaf and • K. Skenderis. project: string theory, in particular the Berkovits formulation of superstrings (theme 1).

Kanitscheider, I.R.G. (oio) as of 1 September 2005 with J. de Boer and M. • Taylor. project: quantum gravity, in particular holography (theme 1).

El-Showk, S.N. (oio) as of 10 September 2005 with J. de Boer. • project: quantum gravity wing perturbative and non-perturbative string theory (theme 1).

Zozulya, O.S. (oio) as of 1 October 2005 with K. Schoutens. • project: collective behavior vs. entanglement in atomic matter (theme 2).

Mehmani, B. (aio) as of 1 December 2005 with B. Nienhuis and • Th.M. Nieuwenhuizen. project: fundamental aspects of quantum physics (theme 2). 30 Annual report 2007

Huijse, L. (aio) as of 1 June 2006 with K. Schoutens. • project: study of superssymetric lattice models (theme 2).

van Rees, B.C. (oio) as of 1 September 2006 with K. Skenderis. • project: understanding black holes and wormholes in 2+1 dimensions as well as global issues in AdS/CFT (theme 1).

Atmaja, A. (oio) as of 1 November 2006 with J. de Boer (K.E. Schalm, formal • advisor). project: studies of string theory/gauge theory duality aiming to make contact with QCD (theme 1).

Oberreuter, J.M. (oio) as of 15 September 2007 with E.P. Verlinde. • project: cosmological vacua in string theory (theme 1).

Vrije Universiteit Amsterdam (VUA)

Conti, E. (aio) as of 1 October 2004 with F.C. MacKintosh. • project: theory of semi-flexible biopolymer networks (theme 2).

Wessels, E. (oio) as of 1 December 2004 with P.J.G. Mulders and D. Boer. • project: investigating observable consequences of the colour glass condensate (theme 1).

Boomsma, J.K. (aio) as of 1 September 2006 with P.J.G. Mulders and D. Boer. • project: phase transitions in QCD (theme 1).

van Dijk, T. (oio) as of 1 April 2007 with T. Visser. • project: singular optics and plasmonics (theme 2)

Broedersz, C.P. (aio) as of 1 May 2007 with F.C. MacKintosh. • project: theoretical development of models for cytoskeletal networks (theme 2).

Stegeman, L.T. (oio) as of 1 November 2007 with T. Visser. • project: optical coherence theory (theme 2).

University of Groningen (RUG)

Hartong, J. (aio) as of 1 September 2004 with E.A. Bergshoeff. • project: the quest for quantum gravity (theme 1).

Ploegh, A.R. (oio) as of 1 September 2004 with E.A. Bergshoeff. • project: towards a formulation of coinciding M5-branes (theme 1).

Chemissany, W. (bursaal) as of 1 October 2004 with M. de Roo. • project: light from string theory (theme 1).

Deuzeman, A. (bursaal) as of 1 January 2006 with E.A. Bergshoeff. • project: understanding non-perturbative aspects of strong and weak interactions (theme 1). 3. PhD programme 31

Ruszel, W.M. (bursaal) as of 1 March 2006 with A.C.D. van Enter. • project: non-Gibbsian aspects in lattice statistical mechanics (theme 2).

Kadosh, A. (bursaal) as of 1 September 2006 with M. de Roo. • project: understanding and constraining extra-dimensional theories (brane worlds) derived as effective low-energy realizations of M-theory (theme 1).

Nutma, T.A. (oio) as of 1 October 2006 with E. Bergshoeff. • project: string theory and quantum gravity (theme 1).

Leiden University (UL)

Becherer, P. (aio) as of 1 January 2004 with W. van Saarloos. • project: dynamics of friction and polymer flow (theme 2).

de Kok, M.O. (oio) as of 1 January 2004 with P. van Baal. • project: non-perturbative aspects of gauge theories (theme 1).

Zacheddu, M. (oio) as of 1 January 2004 with C. Filippi. • project: Why is green fluorescent protein green? A quantum Monte Carlo study (theme 2).

Salmi, P. (oio) as of 1 July 2004 with A. Ach´ucarro. • project: semilocal string networks in the early universe (theme 1).

Bardarson, J. (oio) as of 1 September 2004 with C.J.W. Beenakker. • project: theory of phase-coherent dynamics of entangled electronic states in nanostructures (theme 2).

Sousa, K.S. (aio) as of 1 September 2004 with A. Ach´ucarro. • project: extended objects in cosmological models with supersymmetry (theme 1).

Snyman, I. (oio) as of 15 January 2005 with C.J.W. Beenakker. • project: developing theory for nanostructures that are strongly coupled to radi- ation, with the goal of studying ways to produce entangled microwave photons out of entangled electron-hole pairs (theme 2).

Giovanetti, G. (oio) as of 1 August 2005 with J. van den Brink. • project: electronic structure and electron correlations in organic molecular crys- tals (theme 2).

Idema, T. (oio) as of 1 September 2005 with H. Schiessel and C. Storm. • project: theoretical biophysics of membranes and proteins (theme 2).

Emanuel, M.O. (aio) as of 1 December 2005 with H. Schiessel. • project: theoretical biophysics of DNA and its complexation with proteins (theme 2).

Beekman, A.J. (oio) as of 1 January 2006 with J. Zaanen. • project: topological phases in quantum liquid crystals (theme 2). 32 Annual report 2007

Habraken, S.J.M. (aio) as of 1 February 2006 with G. Nienhuis. • project: quantum optics with complex light (theme 2). Ament, L. (aio) as of 1 September 2006 with J. van den Brink. • project: theory of decoherence and defect formation in many-body quantum systems (theme 2). Mesaroˇs,A. (aio) as of 1 September 2006 with J. Zaanen. • project: quantum liquid crystals and emerging Einsteinian gravity (theme 2). Sepkhanov, R.A. (aio) as of 1 September 2006 with C.W.J. Beenakker. • project: investigation of transport properties in graphene, with a particular emphasis on the role of superconductivity (theme 2). Zeravˇci´c,Z.ˇ (oio) as of 1 September 2006 with W. van Saarloos. • project: the behavior of the granular media in the vicinity of the so-called ‘jamming point’ (theme 2). Huisman, E.M. (aio) as of 1 April 2007 with G. Barkema. • project: networks of semi-flexible polymers (theme 2). She, J.-H. (aio) as of 1 May 2007 with J. Zaanen. • project: fermionic quantum criticality and the constrained path integral (theme 2). Akhmerov, A. (oio) as of 1 July 2007 with C.W.J. Beenakker. • project: investigation of the potential of spin and valley qubits in graphene for quantum computation (theme 2). Hardeman, S.R. (aio) as of 1 November 2007 with A. Ach´ucarroand K. Schalm. • project: observational cosmology from strings, branes and quantum gravity (theme 1). Radboud University Nijmegen (RU) van Kessel, M.T.M. (oio) as of 1 April 2004 with R.H.P. Kleiss. • project: path integral aspects of spontaneous symmetry breaking (theme 1). Wagenaar, J.W. (aio) as of 1 December 2004 with R.H.P. Kleiss. • project: Kaon-nucleon interactions (theme 1). van den Oord, G.J.W.M. (oio) as of 1 February 2007 with R.H.P. Kleiss and • S.C.M. Bentvelsen. project: to probe the nature of the Higgs sector, comparing observed data with model-independent, Monte Carlo generated events (theme 1). Utrecht University (UU) Vocks, H. (aio) as of 1 June 2004 with G.T. Barkema (H. van Beijeren, formal • advisor). project: polymers and polymeric systems by means of computer simulation (theme 2). 3. PhD programme 33

Torres Valderrama, A. (oio) as of 1 September 2004 with R.H.H.G. van Roij (H. • van Beijeren, formal advisor). project: gaining theoretical understanding of suspensions of charged colloids, in particular in external fields (theme 2).

Stavenga, G.C. (aio) as of 1 May 2005 with E. Laenen and B. de Wit. • project: perturbative and non-perturbative QCD in high-energy scattering (theme 1).

Koetsier, A.O. (aio) as of 1 August 2005 with H.T.C. Stoof. • project: thermodynamical and dynamical properties of degenerate gases (theme 2).

Janssen, T.M. (aio) as of 1 September 2005 with T. Prokopec (G. ’t Hooft, • formal advisor). project: novel observational consequences from cosmic inflation and observa- tional consequences of interacting quantum fields during inflation (theme 1).

Kuipers, J. (aio) as of 1 September 2005 with H. van Beijeren and G.T. Barkema. • project: comparison between classical nucleation theory (CNT) and computer simulation results of nucleation in lattice gases (theme 2).

Zwanikken, J.W. (aio) as of 1 September 2005 with R.H.H.G. van Roij (H. van • Beijeren, formal advisor). project: theoretical study of suspensions of colloidal molecules, such as dumb- bells and (semi-) flexible chains, both in bulk and in external fields (electric, shear, gravity) (theme 2).

Lim, L.-K. (aio) as of 15 January 2006 with C. Morais Smith. • project: the application of theoretical methods to describe rotating Bose-Einstein Condensates in the quantum Hall limit (theme 2).

Gubbels, K. (aio) as of 1 February 2006 with H.T.C. Stoof. • project: ultra cold atomic gases (theme 2).

Eggen, E.J. (aio) as of 1 March 2006 with R.H.H.G. van Roij (H. van Beijeren, • formal advisor). project: theoretical study of suspensions of colloidal molecules such as dumb- bells and (semi-) flexible chains, both in bulk and in external fields (electric, shear, substrates) (theme 2).

Reska, P. (aio) as of 1 Augustus 2006 with R. Loll. • project: the focus is on various aspects of non-perturbative quantum gravity and quantum cosmology, and in particular the question of the role of the conformal factor and big-bang scenarios (theme 1).

Makogon, D. (aio) as of 15 August 2006 with C. Morais Smith. • project: transport properties in one dimensional systems (theme 2). 34 Annual report 2007

de Leeuw, M. (aio) as of 1 October 2006 with G. Arutyunov (B. de Wit, formal • advisor). project: the development and application of new methods aimed to further understand the relationship between gauge and string theories (the AdS/CFT correspondence) (theme 1).

Looyestijn, H.T. (aio) as of 1 October 2006 with S. Vandoren (B. de Wit, formal • advisor). project: to study the perturbative and non-perturbative structure of type II superstrings compactified to four space-time dimensions, and its relation to heerotic string theory (theme 1).

Machado, P. (aio) as of 1 July 2007 with R. Loll. • project: various aspects of non-perturbative quantum gravity and quantum cosmology (theme 1).

Katmadas, S. (oio) as of 1 September 2007 with B. de Wit. • project: study of black holes in the context of string theory (theme 1).

Koksma, J. (oio) as of 15 September 2007 with T. Prokopec (G. ’t Hooft, formal • advisor). project: study the nature of dark energy (theme 1).

Diederix, J. (aio) as of 1 October 2007 with H.T.C. Stoof. • project: research in the field of ultracold atomic gasses (theme 2).

van Zalk, M. (oio) as of 1 October 2007 with B. de Wit. • project: study of N=2 and 4 supergravities and their consequences for fluxcom- pactifications and black holes (theme 1).

van de Meent, M. (aio) as of 1 November 2007 with G. ’t Hooft. • project: algebraical description of quantum effects of the Schwarzschild horizon and related aspects of quantum gravity (theme 1).

3.6 Scientific and educational activities of PhD stu- dents (theme 1)

Arsiwalla, X.D. (UvA) – Aspects of black rings in string theory, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Atmaja, A.N. (UL) – DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (attended) – Photon production in AdS/QCD, DRSTP Symposium Trends in Theory 2007, Dalf- sen, the Netherlands, 31 May-1 June 2007 (poster) – Paris-Brussels-Amsterdam School on String Theory, Fall 2007 (attended) 3. PhD programme 35

Benedetti, D. (UU) – The continuum limit of 3d causal dynamical triangulations, PhD Thesis Talk, In- stitute for Theoretical Physics, Utrecht, the Netherlands, 21 May 2007 (talk) Bomhof, C. (VUA) – The role of gauge invariance in single-spin asymmetries, 15th International Work- shop on Deep Inelastic Scattering and Related Subjects (DIS 2007), Munich, Ger- many, 16-20 April 2007 (talk) Boomsma, J.K. (VUA) – Light-front dynamics of the Yukawa model; a study of regularisation methods ap- plied to the box diagram, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (talk) – Light-front dynamics of the Yukawa model, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Spontaneus CP violation in the strong interaction, NNV Annual Meeting, Lunteren, the Netherlands, 9 November 2007 (talk) Cheng, M.C.-N. (UvA) – DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (attended) – Harvard University, October-December 2007 (work visit) – Dying dyons don’t count, Seminar Harvard University, USA, 30 November 2007 (talk) Chemissany, W. (RUG) – 21st Nordic Network Meeting on Strings, Fields and Branes, Stockholm, Sweden, 15-17 February 2007 (attended) – Pseudo-susy and geodesic motion in scalar cosmology, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Effective theory and duality, Lebanese University and American University, Beirut, Lebanon, July 2007 (talk) – String theory in Groningen, 3rd RTN Workshop on Constituents, Fundamental Forces and Symmetries of the Universe, Valencia, Spain, 1-5 October 2007 (talk) – 9th National Astroparticle Physics Symposium, Kapteyn Astronomical Institute, Groningen, the Netherlands, 12 October 2007 (attended) de Kok, M.O. (UL) – DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (attended and was also a member of the program committee together with J. Zaanen, K. Schoutens and S. Vandoren) de Leeuw, M. (UU) 5 – S-matrix for strings on AdS5 S , DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil,× 28 January-10 February 2007 (talk) – Bethe Ansatz in AdS/CFT, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Symposium ENRAGEing Ideas, Utrecht, the Netherlands, 6-8 September 2007 (attended) – Workshop Integrability and the Gauge/String Correspondence, Isaac Newton In- stitute, Cambridge, UK, 10-14 December 2007 (attended) 36 Annual report 2007 de Vroome, M. (UU) – N=2 supersymmetric theories, dyonic charges and instantons, PhD Thesis Talk, Institute for Theoretical Physics, Utrecht, the Netherlands, 30 May 2007 (talk) – DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (attended) Deuzeman, A. (RUG) – Preconditioning hermitian domain wall fermions, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) El-Showk, S.N. (UvA) – Open G2 strings, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (talk) – Exploring black hole microstates, DRSTP Symposium Trends in Theory 2007, Dalf- sen, the Netherlands, 31 May-1 June 2007 (poster) – Simons Workshop in Mathematics and Physics 2007, Stony Brook, New York, USA, 30 July-9 August 2007 (attended) Hartong, J. (RUG) – New seven-branes and instantons in IIB supergravity, 21st Nordic Network Meeting on Strings, Fields and Branes, Stockholm, Sweden, 15-17 February 2007 (talk) – A new type of 7-brane, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – D. Sorokin, University of Padua, Italy, 4-8 June 2007 (work visit) – A new type of seven-brane, Seminar Strings and Field Theory Group, University of Padova, Italy, June 2007 (talk) – Cosmic strings in N = 2, d = 4 supergravity coupled vector and hyper supermul- tiplets, 7th International Workshop Supersymmetries and Quantum Symmetries, Dubna, Russia, 30 July-4 August 2007 (talk) – Q-branes in IIB supergravity, 3rd RTN Workshop on Constituents, Fundamental Forces and Symmetries of the Universe, Valencia, Spain, 1-5 October 2007 (talk) – Universidad Autonoma de Madrid, Spain, April, October and November 2007 (work visit) Hollands, L. (UvA) – Workshop London Mathematical Society, invited Lecture Series by David Ben-Zvi, Oxford University, UK, 10-14 April 2007 (attended) – What is this geometric Langlands stuff anyway?, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Supersymmetric gauge theories, intersecting branes and free fermions, ITFA String Theory Journal Club, UvA, Amsterdam, the Netherlands, 4 October 2007 (talk) – Topological strings as D-modules, PhysMath Seminar, Utrecht, the Netherlands, 7 December 2007 (talk) Hoogeveen, J. (UvA) – Pure spinor formalism, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (talk) – Amplitude prescriptions in string theory, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Gauge fields and strings, School on Integrability and Strings, The Isaac Newton Institute, Cambridge, UK, 17-27 September 2007 (attended) 3. PhD programme 37

Janssen, T.M. (UU) – Vacuum properties of nonsymmetric gravity, DRSTP Postgraduate Course Theor- etical High Energy Physics, 28 January-10 February 2007, S˜aoPaulo, Brazil (talk) – A theorists view on dark matter, Astronomical Institute, Utrecht University, the Netherlands, 13 March 2007 (talk) – Vacuum properties of nonsymmetric gravity, Cosmology Meeting, Leiden, the Netherlands, 23 March 2007 (talk) – Vacuum properties of nonsymmetric gravity, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – A graviton propagator for inflation, COSMO07, University of Sussex, Brighton, UK, 21-25 August 2007 (talk) – Field theory during inflation, 9th National Astroparticle Physics Symposium, Kapteyn Astronomical Institute, Groningen, the Netherlands, 12 October 2007 (talk) – Chiral antisymmetric tensor field, Cosmology Journal Club, Utrecht, the Nether- lands, 10 November 2007 (talk) – Local void vs dark energy, Cosmology Journal Club, Utrecht, the Netherlands, 7 December 2007 (talk) Kadosh, A. (RUG) – Non-perturbative cosmological constraints for brane world scenarios, DRSTP Sym- posium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Kampmeijer, L. (UvA) – Fundamental monopoles, dyons and fusion rules, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Kanitscheider, I.R.G. (UvA) – The fuzzball proposal for black holes and AdS/CFT, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (talk) – The fuzzball proposal for blackholes and AdS/CFT, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Les Houches Summer School, Les Houches, France, 2-27 June 2007 (attended) – Fuzzballs with internal excitations, International Young Researchers Workshop of the Superstring Network, E¨otvos University, Budapest, Hungary, 3-7 September 2007 (talk) Koksma, J. (UU) – Workshop FOM Young Scientists’ Day, Amsterdam, the Netherlands, 13 December 2007 (attended) Looyestijn, H.T. (UU) – Instantons and moduli stabilization in type IIA supergravity, DRSTP Postgradu- ate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (talk) – Our world from string theory dualities and symmetries, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Symposium ENRAGEing Ideas, Utrecht, the Netherlands, 6-8 September 2007 (attended) 38 Annual report 2007

– PhD-School Paris-Brussels-Amsterdam, Laboratoire de Physique Th´eorique,Ecole Normale Sup´erieure,Paris, France, 17 September-5 October 2007; Physique th´eoriqueet math´ematique,Universit´eLibre de Brussel, Brussels, Belgium, 15-31 October 2007; Institute for Theoretical Physics, Univer- sity of Amsterdam, the Netherlands, 12-30 November 2007 (attended) Machado, P. (UU) – Can one hear the shape of a fractal spacetime?, DRSTP Postgraduate Course The- oretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007 (talk) – The spectral geometry of quantum spacetime, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – ENRAGE Topical School Random Trees 2007, University of Iceland, Reykjavik, Iceland, 20-24 August 2007 (attended) Manschot, J. (UvA) – Paris-Amsterdam Joint Meeting on Holography and Black Holes, 5-6 March 2007, Paris, France (attended) – Black holes, circles and tori, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Conference Strings 2007, Madrid, Spain, 25-29 June 2007 (attended) – 5th Simons Workshop, UCLA, Stony Brook, USA, 30 July-8 August 2007 (atten- ded) – Black holes, black rings and modular forms, XXXVIIth Paris Summer Institute, Paris, France, 15-17 August 2007 (attended) – Rutgers University, Piscataway, USA, 5-12 November 2007 (work visit) – Institute of Advanced Study, Princeton, USA, 13-15 November 2007 (work visit) Messamah, I. (UvA) – Another face of black holes, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Nutma, T.A. (RUG) – The equivalence of Scherk-Schwarz I, II, and I+II, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-9 February 2007 (talk) – Conference String and M Theory Approaches to Particle Physics and Cosmology, The Galileo Galilei Institute for Theoretical Physics (GGI), Florenze, Italy (atten- ded) – From E11 to supergravity, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Kac-Moody Algebras & Supergravity, Barcelona, Spain, 19 July 2007 (talk) – 3rd RTN Workshop on Constituents, Fundamental Forces and Symmetries of the Universe, Valencia, Spain, 1-5 October 2007 (attended) – Departament d’Estructura i Constituents de la Mat´eria,University of Barcelona, Spain, 2007 (work visit)

Oberreuter, J.M. (UvA) – PhD-School Paris-Brussels-Amsterdam, Laboratoire de 3. PhD programme 39

Physique Th´eorique,Ecole Normale Sup´erieure,Paris, France, 17 September-5 October 2007; Physique th´eoriqueet math´ematique,Universit´eLibre de Brussel, Brussels, Belgium, 15-31 October 2007; Institute for Theoretical Physics, Univer- sity of Amsterdam, the Netherlands, 12-30 November 2007 (attended) Ploegh, A.R. (RUG) – RTN Winter School on Strings, Supergravity and Gauge Theories, CERN, Switzer- land, 15-19 January 2007 (attended) – 21st Nordic Network Meeting on Strings, Fields and Branes, Stockholm, Sweden, 15-17 February 2007 (attended) – A note on scaling cosmologies, geodesic motion and pseudo-susy, DRSTP Sym- posium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Conference Strings ’07, Madrid, Spain, 25-29 June 2007 (attended) – Workshop Supersymmetries and Quantum Symmetries (SQS’07), Dubna, Russia, 30 July-4 August 2007 (attended) – 3rd RTN Workshop on Constituents, Fundamental Forces and Symmetries of the Universe, Valencia, Spain, 1-5 October 2007 (attended) – 9th National Astroparticle Physics Symposium, Groningen, the Netherlands, 12 October 2007 (attended) Reska, P. (UU) – Problems in quantum gravity, DRSTP Postgraduate Course Theoretical High En- ergy Physics, S˜aoPaulo, Brazil, 28 January-9 February 2007 (talk) – Wick rotations in quantum gravity, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – ENRAGE Topical School Random Trees 2007, University of Iceland, Reykjavik, Iceland, 20-24 August 2007 (attended) – Activities in ENRAGE network, ENRAGE Midterm Meeting and Symposium EN- RAGing Ideas, Utrecht, the Netherlands, 6-8 September 2007 (talk) Salmi, P.E. (UL) – Numerical investigations of oscillons in two dimensions, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Field theoretical approach to the formation of junctions of cosmic strings, PAS- COS07, Imperial College London, UK, 2-7 July 2007 (talk) – Field theoretical approach to the formation of junctions of cosmic strings, COSMO07, Brighton, UK, 21-25 August 2007 (talk) – Monitoring oscillons on a lattice with absorbing boundaries, UK Classical Numer- ical Lattice Field Theory Network Meeting, Durham, UK, 21-22 September 2007 (talk) – Field theoretical approach to the formation of junctions of cosmic strings, Strings and Superstrings in Observational Cosmology, APC, Paris, France, 10-13 December 2007 (talk) – The Early Universe 25 Years On, Cambridge, UK, 20-23 December 2007 (attended)

Sousa, K.S. (UL) 40 Annual report 2007

– Journ´eesTourangelles de R´elativit´e,Tours, France, 29 May-2 June 2007 (attended) – F-term uplifting consistent with Kahler invariance, Strings and Superstrings in Observational Cosmology, APC, Paris, France, 10-13 December 2007 (talk) Stavenga, G.C. (UU) – Factorization and resummation in QCD, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-9 February 2007 (talk) – Resummation in QCD, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Stavenga, G.C. (UU) – Factorization and resummation in QCD, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-9 February 2007 (talk) – Non-abelian exponentiatie in QCD, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) van der Meulen, M.P. (UvA) – Classical approximation to quantum cosmological correlations, Dutch Theoretical Cosmology Seminar, ITF, UA, the Netherlands, 20 April 2007 (talk) – Classical approximation to quantum cosmological correlations, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Classical approximation to quantum cosmological correlations, International COSMO07 Conference, Brighton, UK, 21 August 2007 (talk) – Classical approximation to quantum cosmological correlations, Theory Seminar, Laboratoire Astroparticule & Cosmologie (APC), Universite 7 - Denis Diderot, Paris, France, 16 October 2007 (talk) – Classical approximation to quantum cosmological correlations, NIKHEF Theory Meeting, Amsterdam, the Netherlands, 19 October 2007 (talk) van Rees, B.C. (UvA) – Wormholes in AdS3, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-9 February 2007 (talk) – Wormholes in 2+1 dimensions, DRSTP Symposium Trends in Theory 2007, Dalf- sen, the Netherlands, 31 May-1 June 2007 (poster) – International Young Researchers Workshop of the Superstring Network, E¨otvos University, Budapest, Hungary, 3-7 September 2007 (attended) van Riet, T.M. (RUG) – Pseudo-susy and geodesic motion in scalar cosmology, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Wagenaar, J.W. (RU) – Soft core model for Meson-baryon interactions, DRSTP Symposium Trends in The- ory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Wessels, E. (VUA) – Lambda polarization as an experimental probe of parton saturation, Workshop High Energy QCD: from RHIC to LHC, ECT*, Trento, Italy, 8-13 January 2007 (talk) – Investigating the extended geometric scaling region at the LHC with polarized and unpolarized final states, Workshop Heavy Ion Collisions at the LHC. Last Call for Predictions, CERN, Switzerland, 14 May-8 June 2007 (talk) 3. PhD programme 41

Westra, W. (UU) – ENRAGE Network School and Meeting, University of Barcelona, Spain, 16-21 April 2007 (attended) – ENRAGE Topical School Random Trees 2007, University of Iceland, Reykjavik, Iceland, 20-24 August 2007 (attended) – ENRAGE Midterm Meeting and Symposium ENRAGEing Ideas, Utrecht Univer- sity, the Netherlands, 6-8 September 2007 (attended) – Causality and the configuration space of quantum gravity, PhD Thesis Talk, Insti- tute for Theoretical Physics, Utrecht, the Netherlands, 1 October 2007 (talk)

3.7 Scientific and educational activities of PhD stu- dents (theme 2)

Akhmerov, A.R. (UL) – Boundary dependence of Hall transport in graphene, 4th Windsor Summer School on Condensed Matter Theory, Windsor, UK, 6-18 August 2007 (poster) – Boundary conditions for Dirac fermions on a terminated honeycomb lattice, RTN NANO Meeting on Fundamentals of Nanoelectronics, Portoroz, Slovenia, 2-7 September 2007 (talk) Ament, L.J.P. (UL) – Probing magnons with X-rays, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (poster) – Probing magnons with X-rays, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Probing magnons with X-rays, NNV Conference Fysica 2007, Eindhoven, the Netherlands, 27 April 2007 (poster) – Theory of resonant inelastic x-ray scattering, Conference IXS2007, Awaji, Japan, 7-11 May 2007 (poster) – Probing magnons with X-rays, DRSTP Symposium Trends in Theory 2007, Dalf- sen, the Netherlands, 31 May-1 June 2007 (poster) – Theory of resonant inelastic X-ray scattering, Summer School and Workshop Highly Frustrated Magnets and Strongly Correlated Systems: From Non- Perturbative Approaches to Experiments, International Centre for Theoretical Physics, Trieste, Italy, 30 July-17 August 2007 (poster) – Theory of resonant inelastic x-ray scattering, Workshop on Moments and Mul- tiplets in Mott Materials, Kavli Institute for Theoretical Physics, Santa Barbara, United States, 7-30 November 2007 (talk) Bardarson, J.H. (UL) – How spin-orbit interaction can cause electronic shot noise, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (talk) 42 Annual report 2007

– Demonstration of one-parameter scaling at the Dirac point in graphene, 4th Wind- sor Summer School on Condensed Matter Theory, Windsor, UK, 6-18 August 2007 (poster) – Demonstration of one-parameter scaling at the Dirac point in graphene, RTN NANO Meeting on Fundamentals of Nanoelectronics, Portoroz, Slovenia, 2-7 September 2007 (talk) Becherer, P. (UL) – Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) – Second Dutch Soft Matter Meeting, Leiden, the Netherlands, 5 April 2007 (atten- ded) – Casimir Science Days, Eindhoven, the Netherlands, 7-9 May 2007 (attended) – Extensional flows of viscoelastic fluids, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Amsterdam-New Amsterdam Soft Matter Meeting, Amsterdam, the Netherlands, 13-14 December 2007 (attended) Beekman, A.J. (UL) – Quantum crystal melting, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Quantum liquid crystals as Hopf-symmetry condensates, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Broedersz, C.P. (VUA) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) – Effective medium theory for stiff polymer networks with highly compliant cross- linkers, International Soft Matter Conference, Eurogress Aachen, Germany, 1-5 October 2007 (poster) Conti, E. (VUA) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) – Simulations of semiflexible networks: nonaffine deformations and nonlinear elastic response, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Simulations of semiflexible networks: nonaffine deformations and nonlinear elastic response, 23rd International Conference on Statistical Physics of the International Union for Pure and Applied Physics (IUPAP) Conference Center, Genova, Italy, 9-13 July 2007 (poster) – Simulations of semiflexible networks: nonaffine deformations and nonlinear elastic response, 3rd Dutch Soft Matter Meeting, Utrecht University, the Netherlands, 18 October 2007 (poster and talk) Eggen, E.J. (UU) – Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) – Second Dutch Soft Matter Meeting, Leiden, the Netherlands, 5 April 2007 (atten- ded) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, 3. PhD programme 43

Driebergen, the Netherlands, 23-27 April 2007 (attended) – Charged colloidal rods: pair interactions and excluded volume of finite length charged colloidal rods, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Charged colloidal rods: pair interactions and excluded volume of finite length charged colloidal rods, CECAM-Workshop: New Directions in Liquid State Theory, Lyon, France, 3 July 2007 (poster) – Charged colloidal rods: pair interactions and excluded volume of finite length charged colloidal rods, Soft, Complex and Biological Matter Conference SoCoBiM 2007, Citta del Mare, Terrasini, Sicily, Italy, 15-19 July 2007 (poster) – Charged colloidal rods: pair interactions and excluded volume of finite charged colloidal rods, International Soft Matter Conference, Aachen, Germany, 1-4 October 2007 (poster) – Third Dutch Soft Matter Meeting, Utrecht, the Netherlands, 18 October 2007 (attended) – NWO Talent Class: Write it Right Workshop, Den Haag, the Netherlands, 4 December 2007 (attended) – New-York-Amsterdam Meeting, Amsterdam, the Netherlands, 13-14 December 2007 (attended) Ellenbroek, W.G. (UL) – Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) – APS March Meeting, Denver, Colarado, USA, 5-9 March 2007 (attended) – 2nd Dutch Soft Matter Meeting, Leiden, the Netherlands, 6 April 2007 (attended) – Symposium on Dynamics of Patterns, Enschede, the Netherlands, 26-27 April 2007 (attended) – Casimir Science Days, Deurne/Eindhoven, the Netherlands, 7-9 May 2007 (atten- ded) – Aspen Summer Program, Workshop on Jamming, Aspen, Colorado, USA, 23 July- 10 August 2007 (attended) Emanuel, M.O. (UL) – Semi-classical buckling of stiff polymers, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Semi-classical buckling of stiff polymers, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Buckling, Boulder Summer School on Biophysics, Boulder, Colorado, USA, 2-27 July 2007 (poster) Giovanetti, G. (UL) – Electronic structure and correlations in pristine and potassium doped Cu-Phthalocyanine molecular crystals, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (poster) – Substrate-induced band gap in graphene on hexagonal boron nitride: ab initio dens- ity functional calculations, NanoNed Electronics Meeting, Utrecht University, the Netherlands, 17-18 September 2007 (talk) 44 Annual report 2007

– Origin of ferroelectricity in multiferroic HoMn2O5 from first principle calculations, University of Dublin, Trinity College, Ireland, 15 November 2007 (talk) – Mott state in potassium-intercalated pentacene, University of Twente, Enschede, the Netherlands, December 2007 (talk) Gubbels, K. (UU) – Physics@Veldhoven 2007, annual physics meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) – Sarma phase in trapped unbalanced Fermi gases, Spring Meeting Lunteren for Atomic, Molecular and Optical Physics, Lunteren, the Netherlands, 4-5 April 2007 (poster) – Ultracold Fermi gases with a population imbalance, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Sarma phase in trapped unbalanced Fermi gases, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Condensates in ultracold atomic gases, Utrecht Summer School in Theoretical Physics, Utrecht, the Netherlands, 13-24 August 2007 (talk) – ICTP Summer School on Novel Quantum Phases and Non-Equilibrium Phenomena in Cold Atomic Gases, Trieste, Italy, 27 August-7 September 2007 (attended) Habraken, S.J.M. (UL) – Twisted cavity modes, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (poster) – Twisted cavity modes, OptETH Winter School, ETH Z¨urich, Switzerland, 26 February-2 March 2007 (poster) – Orbital angular momentum of cavity modes, AMO-Meeting NNV, Lunteren, the Netherlands, 5-6 April 2007 (talk) – Twisted cavity modes, Casimir Science Days, Eindhoven, the Netherlands, 7-9 May 2007 (poster) – The structure of twisted cavity modes, Coherence and Quantum Optics 9, Rochester, New York, USA, 10-13 June 2007 (poster) – Orbital angular momentum of twisted cavity modes, CLEO Europe/IQEC 2007, Munich, Germany, 17-22 June 2007 (poster) Hagemans, R.L. (UvA) – Dynamics of quantum spin chains, Physics@Veldhoven 2007, Annual Physics Meet- ing of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (talk) – Dynamics of Heisenberg spin chains, Seminar Condensed Matter Theory, Utrecht University, 15 March 2007 (talk) – International Summer School: Second Latin American School and Conference in Statistical Physics and Interdisciplinary Applications, Bento Gon¸calves, Brazil, 5- 15 February 2007 (attended) Huijse, L. (UvA) – Masterclass by Sir M. Berry at Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (attended) – Supersymmetric lattice models, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) 3. PhD programme 45

– Het standaardmodel, in de serie ‘de B`etacanon’,De Volkskrant, 14 May 2007 (art- icle). – Supersymmetric lattice models, (with K. Schoutens) DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Quantum computation and topological orders, Summer School, El Escorial, Spain, July 16-20, 2007 (attended) – INSTANS Summer School, Oxford University, UK, 26 August-2 September 2007 (attended) – Oxford University, UK, to collaborate with prof. P. Fendley, 13-21 December 2007 (work visit) Huisman, E.M. (UL) – Modelling of 3D Actin-networks, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (attended) – Amsterdam-New Amsterdam Meeting, Amsterdam, the Netherlands, 13-14 Decem- ber 2007 (attended) Idema, T. (UL) – Towards understanding the shape of multi-component membranes, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (talk) – The math of membranes - how differential geometry can be useful for biology, Math- ematics Seminar, Leiden, the Netherlands, 22 March 2007 (talk) – Collective motor dynamics in membrane tube formation, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Finding cell membrane parameters from giant vesicles, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Amsterdam-New Amsterdam Meeting, Amsterdam, the Netherlands, 13-14 Decem- ber 2007 (attended) Koetsier, A.O. (UU) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) – DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (attended) – ICTP Summer School on Novel Quantum Phases and Non-Equilibrium Phenomena in Cold Atomic Gases, Trieste, Italy, 27 August-7 September 2007 (attended) – Disorder in Condensed Matter and Cold Atoms, Lorentz Center, Leiden, the Netherlands, 24-28 September 2007 (attended) Kuipers, J. (UU) – Recombination of phase space trajectories, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Recombination of phase space trajectories, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) 46 Annual report 2007

Leurs, B.W.A. (UL) – Quantum phases and nodal fermions in high-Tc superconductors, DRSTP Sym- posium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Lim, L.-K. (UU) – Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) – Effective staggered magnetic field in optical lattices, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Effective staggered magnetic field in optical lattices, ICTP Summer School on Novel Quantum Phases and Non-Equilibrium Phenomena in Cold Atomic Gases, Trieste, Italy, 27 August-7 September 2007 (poster) Makogon, D. (UU) – Transport in Luttinger liquids: the role of time-dependent barriers, The Capri Spring School on Transport in Nanostructures, Anacapri, Capri, Italy, 25 March-1 April 2007 (talk) – Transport in quantum wires with oscillating impurities, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Transport properties of Luttinger liquids with oscillating impurities, DRSTP Sym- posium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Mehmani, B. (UvA) – Simultaneous measurement of non-commuting observables, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (talk) – Quantum state tomography, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Quantum state tomography with a single apparatus, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Simultaneous measurement of non-commuting observables within the Jaynes-Cummings model, QTRF4 - Quantum Theory: Reconsiderations and Found- ations 4, 11-16 June 2007, Sweden (talk) – INSTANS Summer School, Oxford University, UK, 26 August-2 September 2007 (attended) – Organized a monthly meeting for the PhD students and postdocs of the condensed matter and WZI group. Every month one of the members gives a talk and explains his/her research topic in a general and understandable way. Mesaroˇs,A. (UL) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) Romans, M.W.J. (UU) – Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) 3. PhD programme 47

– Masterclass From Laser Cooled Atoms to Quantum Gases of Jean Dalibard (ENS, Paris), Veldhoven, the Netherlands, 22 January 2007 (attended) – Dressed molecules in atomic quantum gases, PhD Thesis Talk, Institute for The- oretical Physics, Utrecht, the Netherlands, 1 February 2007 (talk) Ruszel, W.M. (RUG) – Stieltjes Onderwijsweek in Probability in Biological Models, 22-26 January 2007 (attended) – Chaotic temperature dependence at zero temperature, Dynamical Systems Seminar, University of Groningen, the Netherlands, 26 February 2007 (talk) – Workshop on Random Polymers, Eurandom, Eindhoven, the Netherlands, 18-21 June 2007 (attended) – Summer School Statistical Mechanics, Park City, Utah, USA, 1-21 July 2007 (at- tended) – Conservation and loss of gibbsiannes of interacting spins moving on circles random spatial structure seminar, Eurandom, Eindhoven, the Netherlands, 6 November 2007 (talk) – Workshop on Particle Systems and Nonlinear Diffusion, Bonn, Germany, 12-16 November 2007 (attended) – Wolfgang Doeblin Symposium, Berlin, Germany, 17 November 2007 (attended) Sepkhanov, R.A. (UL) – Transmission at the Dirac point of a photonic band structure, DRSTP Postgradu- ate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Transmission at the Dirac point of a photonic band structure, Casimir Science Days, Eindhoven, the Netherlands, 7-9 May 2007 (poster) – Extremal transmission at the Dirac point of a photonic band structure, International WE-Heraeus Summer School on Quantum Noise and Quantum Optics in the Solid State, Bad Honnef, Germany, 5-17 August 2007 (talk) – Extremal transmission at the Dirac point of a photonic band structure, RTN NANO Meeting on Fundamentals of Nanoelectronics, Portoroz, Slovenia, 2-7 September 2007 (talk) She, J.-H. (UL) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) Snyman, I. (UL) – DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (attended) Torres Valderama, A. (UU) – Charged colloids: a many-body problem, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – An effective theory for effective colloidal interactions, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Soft, Complex and Biological Matter Conference SoCoBiM 2007, Citta del Mare, Terrasini, Sicily, Italy, 15-19 July 2007 (attended) 48 Annual report 2007

– Being Successful in Dutch Organizations, Nunspeet, the Netherlands, 7-13 October 2007 (attended) – Business Orientation Programme, Nyenrode Business Universiteit, Breukelen, the Netherlands, 18-24 November 2007 (attended) van Dijk, T. (VUA) – Shaping the focal intensity distribution using spatial coherence, Annual OSA Meet- ing: Frontiers in Optics 2007, San Jose, California, USA, September 2007 (talk) van Wezel, J. (UL) – Spontaneous decoherence in superconducting qubits, Korrelationstage 2007, Max Planck Institute for the Physics of Complex Systems (MPI PKS), Dresden, Ger- many, 26 February-2 March 2007 (poster) – Spontaneous decoherence and the hidden states of superconductors, Cambridge Uni- versity, UK, April 2007 (talk) – Spontaneous decoherence in superconducting qubits, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Quantum Foundations Summer School, Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada, 27-31 August 2007 (attended) Vocks, H. (UU) – Long-time dynamics of dense polymer solutions, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) Zeravˇci´c,Z.ˇ (UL) – Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Neth- erlands, 22-24 January 2007 (attended) – 2nd Dutch Soft Matter Meeting, Leiden, the Netherlands, 5 April 2007 (attended) – Symposium on Dynamics of Patterns, Eindhoven, the Netherlands, 26-27 April 2007 (attended) – Casimir Science Days, Deurne/Eindhoven, the Netherlands, 7-9 May 2007 (atten- ded) – Localization behavior of vibrational modes in granular packings, DRSTP Sym- posium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Satellite for StatPhys23, Naples, Italy, 4-7 July 2007 (attended) – StatPhys23, Genova, Italy, 9-14 July 2007 (attended) – European Women in Mathematics ’07, Cambridge, UK, 3-6 September 2007 (at- tended) – 3nd Dutch Soft Matter Meeting, Utrecht, the Netherlands, 18 October 2007 (at- tended) – Amsterdam-New Amsterdam Soft Matter Meeting, Amsterdam, the Netherlands, 13-14 December 2007 (attended) Zozulya, O.S. (UvA) – Masterclass at Physics@Veldhoven 2007, Annual Physics Meeting of FOM, Veld- hoven, the Netherlands, 22-24 January 2007 (attended) – Entanglement entropy in fractional quantum Hall states, (with M. Haque and K. Schoutens), FOM-Meeting Physics@Veldhoven 2007, Veldhoven, the Netherlands, 23-24 January 2007 (poster) – Capri School on Transport in Nanostructures, Capri, Italy, 25-31 March 2007 (at- 3. PhD programme 49

tended) – Entanglement in fermionic quantum Hall states, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Entanglement entropy in fermionic Laughlin states, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Recent Progress in the Studies of Quantum Gases: Theory and Experiment, Inter- national Conference, Paris, France, 27-30 June 2007 (attended) – Amsterdam Summer Workshop on Low-D Quantum Condensed Matter, Amster- dam, the Netherlands, 2-7 July 2007 (attended) – Lorentz Center Workshop on Computational Complexity of Quantum Hamiltonian Systems, Leiden, the Netherlands, 23-27 July 2007 (attended) – INSTANS Summer School, Oxford University, UK, 26 August- 2 September 2007 (attended) – Lorentz Center Workshop on Disorder in Condensed Matter and Cold Atoms, Leiden, the Netherlands, 24-28 September 2007 (attended) – 25th Winter School in Theoretical Physics, Jerusalem, Israel, 26 December 2007-4 January 2008 (attended) Zwanikken, J.W. (UU) – Charged colloids in oil-water mixtures: screening, partitioning, and adsorption, Physics @Veldhoven 2007, Annual Physics Meeting of FOM, Veldhoven, the Netherlands, 22-24 January 2007 (talk) – Charged colloids in oil-water mixtures: double-layer destruction, DRSTP Post- graduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (talk) – Colloidal particles in oil-water emulsions: double layer destruction at the interface, and salt stabilised droplets, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster) – Double-layer deformation and ionic charge separation near the oil-water interface, Soft, Complex and Biological Matter Conference SoCoBiM 2007, Citta del Mare, Terrasini, Sicily, Italy, 15-19 July 2007 (poster) – Double-layer deformation and ionic charge separation near the oil-water interface, International Soft Matter Conference, Aachen, Germany, 1-4 October 2007 (poster) – Spontaneous oil-in-water emulsification, Third Dutch Soft Matter Meeting, Utrecht, the Netherlands, 18 October 2007 (talk) – (Thermo-)dynamically stabilized emulsions, Amsterdam-New Amsterdam Meeting, Amsterdam, the Netherlands, 13-14 December 2007 (talk) 50 Annual report 2007 4 Scientific staff (31-12-2007)

Below an overview is given of the permanent and temporary staff of the DRSTP on 31 December 2007. Also the associate groups and members are listed. PhD students are given in chapter 3 (sect. 5). Theme 1 refers to particle physics, cosmology, quantum gravity and string theory and theme 2 to quantum matter, quantum information, soft condensed matter and biophysics. The fte commitment of the permanent staff is given in the last column.

4.1 Permanent staff

University of Amsterdam (UvA) theme fte prof. dr. ir. F.A. Bais 1 0.50 dr. J.-S. Caux 2 0.50 prof. dr. J. de Boer 1 0.50 prof. dr. R.H. Dijkgraaf 1 0.50 prof. dr. J.H. Koch 1 0.10 prof. dr. E.L.M.P. Laenen 1 0.20 prof. dr. B. Nienhuis 2 0.50 dr. Th.M. Nieuwenhuizen 2 0.50 prof. dr. A.M.M. Pruisken 2 0.50 prof. dr. K. Schoutens 2 0.50 dr. K. Skenderis 1 0.50 prof. dr. J. Smit 1 0.50 dr. L.J. van den Horn 1 0.25 dr. W.A. van Leeuwen 2 0.50 prof. dr. E.P. Verlinde 1 0.50

Vrije Universiteit Amsterdam (VUA) theme fte dr. K. Allaart 2 0.10 dr. B.L.G. Bakker 1 0.20 dr. D. Boer 1 0.25 prof. dr. B. Krauskopf 2 0.00 prof. dr. F.C. Mackintosh 2 0.50 prof. dr. P.J.G. Mulders 1 0.25 prof. dr. J.W. van Holten 1 0.00 dr. T.D. Visser 2 0.25 52 Annual report 2007

University of Groningen (RUG) theme fte prof. dr. E.A. Bergshoeff 1 0.50 prof. dr. M. de Roo 1 0.50 dr. E. Pallante 1 0.50 prof. dr. A.C.D. van Enter 2 0.50

Leiden University (UL) theme fte prof. dr. A. Ach´ucarro 1 0.80 prof. dr. G.T. Barkema 2 0.00 prof. dr. C.W.J. Beenakker 2 0.40 prof. dr. H.W.J. Bl¨ote 2 0.10 dr. P.J.H. Denteneer 2 0.80 prof. dr. Y. Levin 1 0.20 prof. dr. G. Nienhuis 2 0.40 dr. K.E. Schalm 1 0.80 prof. dr. H. Schiessel 2 0.40 prof. dr. P.J. van Baal 1 0.80 prof. dr. J. van den Brink 2 0.40 prof. dr. ir. W. van Saarloos 2 0.40 prof. dr. J. Zaanen 2 0.80

Radboud University Nijmegen (RU) theme fte dr. W.J.P. Beenakker 1 0.30 prof. dr. A. Fasolino 2 0.20 prof. dr. M.I. Katsnelson 2 0.40 prof. dr. R.H.P. Kleiss 1 0.30 prof. dr. A.N.J.J. Schellekens 1 0.10 prof. dr. J. van den Brink 2 0.00

Utrecht University (UU) theme fte prof. dr. J. Ambjørn 1 0.18 dr. G. Arutyunov 1 0.60 prof. dr. G.T. Barkema 2 0.60 prof. dr. B. de Wit 1 0.60 dr. R.A. Duine 2 0.60 prof. dr. E.L.M.P. Laenen 1 0.10 prof. dr. R. Loll 1 0.60 prof. dr. C. Morais Smith 2 0.60 dr. T. Prokopec 1 0.60 prof. dr. J. Smit 1 0.00 prof. dr. ir. H.T.C. Stoof 2 0.60 prof. dr. G. ’t Hooft 1 0.60 prof. dr. H. van Beijeren 2 0.60 prof. dr. J.E.J.M. van Himbergen 2 0.00 dr. R.H.H.G. van Roij 2 0.60 dr. S. Vandoren 1 0.60 4. Scientific staff (31-12-2007) 53

4.2 Temporary staff

University of Amsterdam (UvA) theme dr. J.M.O. Baptista 1 dr. R.A.P. Britto 1 dr. D.P.A. Faribault 2 dr. A.J. Kashani-Poor 1 dr. M. Kulaxizi 1 dr. P.L. McFadden 1 dr. K. Papadodimas 1 dr. T. Quella 1 dr. S. Reffert 1 dr. M. Shigemori 1 dr. M. Taylor 1 dr. J.P. van der Schaar 1

Vrije Universiteit Amsterdam (VUA) theme dr. D. Danova 2 dr. M. Das 2 dr. K. Green 2

University of Groningen (RUG) theme dr. O. Hohm 2

Leiden University (UL) theme dr. Y.B. Bazaily 2 dr. S.C. Davis 1 prof. dr. C. Filippi 2 dr. R. Jeannerot 1 dr. F. Kr¨uger 2 dr. T. Ludwig 2 dr. A. Ossipov 2 dr. P. Recher 2 dr. V.G. Rousseau 2 dr. D. Sadri 2 dr. D.I. Santiago 2 dr. T. Tighe 2

Radboud University Nijmegen (RU) theme dr. A. Grechnev 2 54 Annual report 2007

Utrecht University (UU) theme dr. L.F. Alday 1 dr. L. Anguelova 1 dr. M. Bier 2 dr. M. Cirafici 1 dr. B. Eden 1 dr. B. Foster 1 dr. K. Goldstein 1 dr. T. Konopka 1 dr. P. Massignan 2 dr. S.P. Miao 1 dr. D. Oriti 1 dr. A. Paredes Galan 1 dr. K. Peeters 1 dr. I. Pushkina 1 dr. H. Sahlmann 1

4.3 Associate members theme prof. dr. H.A. de Raedt (RUG) 2 prof. dr. ir. H. Dekker (TNO/UvA/TU/e) 2 prof. dr. L.-F. Feiner (Philips) 2 dr. B.J. Hoenders (RUG) 2 dr. ir. L.P.J. Kamp (TU/e) 2 prof. dr. J. Knoester (RUG) 2 prof. dr. D. Lohse (UT) 2 NIKHEF theory group (Amsterdam) 1 Theoretical and Polymer Physics Group (TU/e) 2 prof. dr. R.G.E. Timmermans (KVI) 1 5 Academic publications

This chapter presents an overview of publications in refereed journals published in 2007. The publications belonging to theme 1 and theme 2 are given separately. Within each theme the publications are ordered according to university. Occasionally public- ations may be listed twice, when several universities are involved. Publications by associate members are not included. Professional publications are listed in chapter 7.

5.1 Theme 1: Particle physics, cosmology, quantum gravity and string theory

University of Amsterdam – Anastasiou, C., Britto, R.A.P., Feng, B., Kunszt, Z. and Mastrolia, P., D-dimensional unitarity cut method, Phys. Lett. B 645 (2007) 213-216. – Anastasiou, C., Britto, R.A.P., Feng, B., Kunszt, Z. and Mastrolia, P., Unitarity cuts and reduction to master integrals in d dimensions for one-loop amplitudes, JHEP 0703 (2007) 111. – D’Appollonio, G. and Quella, T., The abelian cosets of the Heisenberg group, JHEP 0711 (2007) 045. – Bais, F.A. and Mathy, C.J.M., The breaking of quantum double symmetries by defect condensation, Ann. of Phys. 322 (2007) 522-598. – Bates, B., Doran, C. and Schalm, K.E., Crosscaps in Gepner models and the moduli space of T 2 orientifolds, ATMP 11 (2007) 839-912. – Britto, R.A.P. and Feng, B., Unitarity cuts with massive propagators and algebraic expressions for coefficients, Phys. Rev. D 75 (2007) 105006. – Cheng, C.N. and Verlinde, E.P., Dying dyons don’t count, JHEP 0709 (2007) 070. – Dijkgraaf, R.H., Mathematical structures, in: D. Gross, M. Henneaux, A. Sevrin (Eds.), The Quantum Structure of Space and Time: Proceedings of the 23rd Solvay Conference on Physics, World Scientific Publishing Co. Pte Ltd. (2007) 91-162. – G¨otz,G., Quella, T. and Schomerus, V., Representation theory of sl(2—1), J. Alg. 312(2) (2007) 829-848. – G¨otz,G., Quella, T. and Schomerus, V., The WZNW model on PSU (1,1—2), JHEP 0703 (2007) 003. – Hollands, L., Topological strings on compact Calabi-Yau’s, Nucl. Phys. B - Proc. Suppl. 171 (2007) 281-283. – Hoogeveen, J. and Skenderis, K., BRST quantization of the pure spinor superstring, JHEP 0711 (2007) 081. – Kanitscheider, I.R.G., Skenderis, K. and Taylor, M., Fuzzballs 56 Annual report 2007

with internal excitations, JHEP 0706 (2007) 056. – Kanitscheider, I.R.G., Skenderis, K. and Taylor, M., Holographic anatomy of fuzzballs, JHEP 0704 (2007) 23. – Kashani-Poor, A.K., Nearly Kaehler reduction, JHEP 0711 (2007) 026. – Kashani-Poor, A.K., The wave function behavior of the open topological string partition function on the conifold, JHEP 0704 (2007) 004. – Kashani-Poor, A.K. and Minasian, R., Towards reduction of type II theories on SU(3) structure manifolds, JHEP 0703 (2007) 109. – Lehners, J.L., McFadden, P.L. and Turok, N., Colliding branes in heterotic M- theory, Phys. Rev. D 75 (2007) 103510. – Lehners, J.L., McFadden, P.L. and Turok, N., Effective actions for heterotic M- theory, Phys. Rev. D 76 (2007) 023501. – Lehners, J.L., McFadden, P.L. and Turok, N., Steinhardt, P.J., Generating ekpyrotic curvature perturbations before the big bang, Phys. Rev. D 76 (2007) 103501. – L¨ust,D., Reffert, S., Scheidegger, E., Schulgin, W. and Stieberger, S., Moduli stabilization in type IIB orientifolds II, Nucl. Phys. B 766 (2007) 178-231. – L¨ust,D., Reffert, S., Scheidegger, E. and Stieberger, S., Resolved toroidal orbifolds and their orientifolds, ATMP 12 (2007) 67-183. – Manschot, J., AdS(3) partition functions reconstructed, JHEP 0710 (2007) 103. – Mathy, C.J.M. and Bais, F.A., Nematic phases and the breaking of double symmet- ries, Ann. of Phys. 322 (2007) 709-735. – McFadden, P.L., Turok, N. and Steinhardt, P.J., Solution of a braneworld big crunch/big bang cosmology, Phys. Rev. D 76 (2007) 104038. – Miller, C.M., Schalm, K.E. and Weinberg, E.J., Nonextremal black holes are BPS, Phys. Rev. D 76 (2007) 044001. – Quella, T. and Schomerus, V., Free fermion resolution of supergroup WZNW mod- els, JHEP 0709 (2007) 085. – Quella, T., Runkel, I. and Watts, G.M.T., Reflection and transmission for con- formal defects, JHEP 0704 (2007) 095. – Sarangi, S., Sjui, G., Schalm, K.E. and van der Schaar, J.P., Exact scalar field perturbations in a radiation deformed closed de Sitter universe, JCAP 0703 (2007) 002. – Skenderis, K. and Taylor, M., Anatomy of bubbling solutions, JHEP 0709 (2007) 019. – Skenderis, K. and Taylor, M., Fuzzball solutions and D1-D5 microstates, Phys. Rev. Lett. 98 (2007) 071601. – Skenderis, K. and Townsend, P.K., Pseudo-supersymmetry and the domainwall/ cosmology correspondence, J. Phys. A: Math. Gen. 40 (2007) 6733-6742. – Skenderis, K., Townsend, P.K. and van Proeyen, A., Domain-wall/ cosmology correspondence in AdS/dS supergravity, JHEP 0708 (2007) 036. – Tranberg, A., Smit, J. and Hindmarsh, M., Simulations of cold electroweak baryo- genesis: finite time quenches, JHEP 0701 (2007) 034. – Tranberg, A., Smit, J. and Hindmarsh, M., Simulations of cold electroweak baryo- genesis, in: Proceedings of the International Conference on Strong and Electroweak Matter (SEWM 2006), Published by Upton, New York, Nucl. Phys. A 785 (2007) 102-105. 5. Academic publications 57

– van der Meulen, M.P. and Smit, J., Classical approximation to quantum cosmolo- gical correlations, JCAP 11 (2007) 023.

Vrije Universiteit Amsterdam – Afanasev, A., Anselmino, M., Avakian, H., Cates, G., Chen, J.-P., Chudakov, E., Cisbani, E., de Jager, C., Gamberg, L., Gao, H., Garibaldi, F., Jiang, X., Kumar, K.S., Meziani, Z.-E., Mulders, P.J., Peng, J.-C., Qian, X., Schlegel, M., Souder, P., Yuan, F., and Zhu, L., Transversity and transverse spin in nucleon structure through SIDIS at Jefferson Lab, Working Group Summary at the Workshop on Inclusive and Semi-inclusive Spin Physics with High Luminosity and Large Ac- ceptance at 11 GeV, TJNAF, 13-14 December 2006 (hep-ph/0703288), Report JLAB-PHY-07-620 (2007). – Bacchetta, A., Bomhof, C., DAlesio, U., Mulders, P.J. and Murgia, F., The Sivers single spin asymmetry in photon-jet production, Phys. Rev. Lett. 99 (2007) 212002 (hep-ph/0703153). – Bacchetta, A., Diehl, M., Goeke, K., Metz, A., Mulders, P.J. and Schlegel, M., Semi-inclusive deep inelastic scattering at small transverse momentum, JHEP 0702 (2007) 093 (hep-ph/0611265). – Badalian, A.M. and Bakker, B.L.G., Masses of the eta(c)(nS) and eta (b)(nS) mesons, Phys. Lett. B 646 (1) (2007) 29-33. – Badalian, A.M. and Bakker, B.L.G., The ratios f(D)(s) / f(D) and f(B)(s) / f(B) as a test of the running mass m(s) at low scale, Feb 2007, e-print: (2007) (hep- ph/0702229). – Badalian, A.M. and B.L.G. Bakker, Higher eta(c)(nS) and eta(b)(nS) mesons, Phys. of Atomic Nuclei 70 (10) (2007) 1764-1772. – Badalian, A.M., Bakker, B.L.G. and Simonov, Y.A., Decay constants of the heavy- light mesons from the field correlator method, Phys. Rev. D 75 (11) (2007) 116001 (hep-ph/0702157). – Bakker, B.L.G., Boomsma, J.K. and Ji, C.R., Box diagram in Yukawa theory, Phys. Rev. D 75 (2007) 065010. – Bakker, B.L.G., Boomsma, J.K. and Ji, C.R., Singularities in the light-front Yukawa model, Nucl. Phys. A 790 (2007) 573C-577C. – Boer, D., Gluon saturation effects on single spin asymmetries, Proceedings of the 17th International Spin Physics Symposium, SPIN2006, Kyoto, Japan, 2-7 October 2006, AIP Conf. Proc. 915 (2007) 638-641 (hep-ph/0611376). – Boer, D., Hasch, D. and Mallot, G., Spin physics: session summary, Online Pro- ceedings of the 15th International Workshop on Deep-Inelastic Scattering and Re- lated Subjects (DIS2007), Munich, Germany (2007) http://dx.doi.org/10.3360/dis.2007.21 (arXiv:07071259). – Boer, D., Utermann, A. and Wessels, E., x-Evolution of phenomenological dipole cross sections, Online proceedings of the 15th International Workshop on Deep- Inelastic, Scattering and Related Subjects (DIS2007), Munich, Germany, 16-20 April 2007, http://dx.doi.org/10.3360/dis.2007.53 (hep-ph/07061666). – Boer, D., Utermann, A. and Wessels, E., Compatibility of phenomenological dipole cross sections with the Balitsky-Kovchegov equation, Phys. Rev. D 75 (2007) 094022 (hep-ph/0701219). 58 Annual report 2007

– Bomhof, C.J. and Mulders, P.J., Gluonic pole cross sections and single spin asym- metries in hadron-hadron scattering, JHEP 0702 (2007) 029 (hep-ph/0609206). – Bomhof, C.J. and Mulders, P.J., Sivers effect asymmetries in hadronic collisions, AIP Conf. Proc. 915 (2007) 563-566, Proceedings of the 17th International Spin Physics Symposium (SPIN2006), Kyoto, Japan, 2-7 October 2006 (hep-ph/0611297). – Bomhof, C.J. and Mulders, P.J., The role of gauge invariance in single-spin asym- metries, Proceedings of the International Workshop on Deep Inelastic Scattering (DIS2007), Munich, Germany, 14-18 April 2007, p. 627-630 (hep-ph/07064017). – Bomhof, C.J., Mulders, P.J., Vogelsang, W. and Yuan, F., Single-transverse spin asymmetry in dijet correlations at hadron colliders, Phys. Rev. D 75 (2007) 074019 (hep-ph/0701277). – Ji, C.R., Bakker, B.L.G. and Choi, H.M., New developments in treacherous points of light-front dynamics, Nucl. Phys. A 790 (2007) 583C-587C. – Mulders, P.J., Spin structure functions, Chapter in “Electromagnetic interactions and hadronic structure”, F.E. Close, A. Donnachie and G. Shaw (eds), Cambridge University Press (2007) (ISBN 978-0-521-84420-8) 271-314. – Mulders, P.J., Bomhof, C.J. and Pijlman, F., Universality of single spin asymmet- ries in hard processes, Proceedings of the 14th International Workshop on Deep Inelastic Scattering (DIS2006) Tsukubu, Japan, 20-24 April 2006, M. Kuze, K. Nagano and K. Tokushuku eds, World Sci. (2007) 707-711 (hep-ph/0607210).

University of Groningen – Beane, S.R., Bedaque, P.F., Luu, T.C., Originos, K., Pallante, E., Parreno, A. and Savage, M.J., Hyperon-nucleon scattering from fully-dynamical lattice QCD, Nucl. Phys. A 749 (1-2) (2007) 62-72. – Bergshoeff, E., De Baetselier, I. and Nutma, T.A., E(11) and the embedding tensor, JHEP 0709 (2007) 047. – Bergshoeff, E., Hartong, J., Ploegh, A., Rosseel, J. and van den Bleeken, D., Pseudo-supersymmetry and a tale of alternate realities, JHEP 0707 (2007) 067. – Bergshoeff, E., Hartong, J., Ortin, T. and Roest, D., IIB seven-branes revisited, J. Phys. Conf. Ser. 66 (2007) 012054. – Bergshoeff, E., Hartong, J., Ortin, T. and Roest, D., Evidence for new seven- branes, Fortsch. Phys. 55 (2007) 661-665. – Bergshoeff, E., Hartong, J. and Sorokin, D., Q7-branes and their coupling to IIB supergravity, JHEP 0712 (2007) 079. – Bergshoeff, E., Howe, P.S., Kerstan, S. and Wulff, S., Kappa-symmetric SL(2,R) covariant D-brane actions, JHEP 0710 (2007) 050. – Bergshoeff, E., Hartong, J., Ortin, T. and Roest, D., Seven-branes and supersym- metry, JHEP 0702 (2007) 003. – Bergshoeff, E., de Roo, M., Kerstan, S., Ortin, T. and Riccioni, F., SL(2,R)- invariant IIB brane actions, JHEP 0702 (2007) 007. – Chemissany, W., Ploegh, A. and van Riet, T., A note on scaling cosmologies, geodesic motion and pseudo-susy, Class. Quant. Grav. 24 (2007) 4679-4690. – Chemissany, W., de Roo, M. and Panda, S., Alpha’-corrections to heterotic super- string effective action revisited, JHEP 0708 (2007) 037. 5. Academic publications 59

– Davies, C. and Pallante, E., Methods and models for hadron physics, Frascati Phys. Ser. (XLVI) (2007) (hep-ph/08032368). – Pallante, E., The many uses of effective field theories, Frascati Phys. Ser. (XLVI) (2007). – Rosseel, J., van Riet, T. and Westra, D.B., Scaling cosmologies of N=8 gauged supergravity, Class. Quant. Grav. 24 (2007) 2139-2152.

Leiden University – Ach´ucarro,A., Salmi, P. and Urrestilla, J., Semilocal cosmic string networks, Phys. Rev. D 75 (12) (2007) 121703. – Amendola, L., Charmousis, C. and Davis, S.C., Solar system constraints on Gauss- Bonnet mediated dark energy, JCAP 10 (2007) 004. – Brax, P., van de Bruck, C., Davis, A.C., Davis, S.C., Jeannerot, R. and Postma, M., Moduli corrections to D-term inflation, JCAP 1 (2007) 026. – Brax, P., Davis, A.C., Davis, S.C., Jeannerot, R. and Postma, M., Warping and F-term uplifting, JHEP 9 (2007) 125. – Bruckmann, F., Catterall, S. and de Kok, M., Critique of the link approach to exact lattice supersymmetry, Phys. Rev. D 75 (4) (2007) 045016. – Davis, S.C., Brane world cosmic string interaction, Phys. Lett. B 645 (4) (2007) 323-325. – Esole, M. and Sousa, K., Half-BPS cosmic string in N=2 supergravity in the pres- ence of a dilaton, JHEP 3 (2007) 079. – Levin, Y., Starbursts near supermassive black holes: young stars in the Galactic Centre, and gravitational waves in LISA band, MNRAS 374 2 (2007) 515-524. – Ravindran, V., Smith, J. and van Neerven, W.L., QCD threshold corrections to di-lepton and Higgs rapidity distributions beyond N2LO, Nucl. Phys. B 767 (1-2) (2007) 100-129.

Radboud University Nijmegen – Hiyama, E., Yamamoto, Y. and Rijken, T.A., et al., Few-body aspects of hyper- nuclear physics, Nucl. Phys. A 790 (2007) 646C-650C.

Utrecht University – Akant, L. and Krishnaswami, G.S., Non-anomalous ‘Ward’ identities to supplement large-N multi-matrix loop equations for correlations, JHEP 0702 (2007) 073 (hep- th/0611350). – Alday, L.F., Integrability and the AdS/CFT correspondence, Nucl. Phys. Proc. Suppl. 171 (2007) 255-256. – Alday, L.F. and Maldacena, J., Gluon scattering amplitudes at strong coupling, JHEP 0706 (2007) 064 (hep-th/07050303). – Alday, L.F. and Maldacena, J., Comments on operators with large spin, JHEP 0711 (2007) 019 (hep-th/07080672). – Alday, L.F. and Maldacena, J., Comments on gluon scattering amplitudes via AdS/CFT, JHEP 0711 (2007) 068 (hep-th/07101060). – Alday, L.F., Arutyunov, G., Eden, B., Benna, M.K. and Klebanov, I.R., On the 60 Annual report 2007

strong coupling scaling dimension of high spin operators, JHEP 0704 (2007) 082 (hep-th/0702028). – Ambjørn, J., Loll, R., Westra, W. and Zohren, S., Putting a cap on causality violations in CDT, JHEP 0712 (2007) 017 (gr-qc/07092784). – Ambjørn, J. and Gesser, J.A., World-sheet dynamics of ZZ branes, Phys. Lett. B 653 (2007) 439-444 (hep-th/07063231). – Ambjørn, J. and Gesser, J.A., ZZ branes from a worldsheet perspective, Acta Phys. Pol. B 8 (2007) 3993-4002 (hep-th/07093106). – Ambjørn, J., Dubin, A. and Makeenko, Y., Wilson loops in 2D noncommutat- ive Euclidean gauge theory. 2. 1/theta expansion, JHEP 0710 (2007) 079 (hep- th/0703123). – Arutyunov, G., Frolov, S. and Zamaklar, M., Finite-size effects from giant magnons, Nucl. Phys. B 778 (2007) 1-35 (hep-th/0606126). – Arutyunov, G. and Frolov, S., On string S-matrix, bound states and TBA, JHEP 0712 (2007) 024 (hep-th/07101568). – Arutyunov, G., Plefka, J., Zamaklar, M. and Frolov S., On the off-shell supersym- 5 metry algebraic of the AdS5 S superstring, J. Phys. A 40 (2007) 3583-3606 (hep-th/0609157). × – Arutyunov, G., Frolov, S. and Zamaklar, M., The Zamolodchikov-Faddeev algebra 5 for AdS5 S superstring, JHEP 0704 (2007) 002 (hep-th/0612229). – Basu, R.,× Misra, A., Laenen, E. and Motylinski, P., Soft-collinear effects in prompt photon production, Phys. Rev. D 76 (2007) 014010 (hep-ph/0704.3180). – Beisert, N., Eden, B. and Staudacher, M., Transcendentality and crossing, J. Stat. Mech. 07 (2007) P01021 (hep-th/0610251). – Benedetti, D. and Loll, R., Unexpected spin-off from quantum gravity, Physica A 377 (2007) 373-380 (hep-lat/0603013). – Benedetti, D. and Loll, R., Quantum gravity and matter: counting graphs on causal dynamical triangularity, Gen. Rel. Grav. 39 (2007) 863-898 (gr-qc/0611075). – Benedetti, D., Loll, R. and Zamponi, F., (2+1)-dimensional quantum gravity as the continuum limit of causal dynamical triangulations, Phys. Rev. D 76 (2007) 104022 (hep-th/07043214). – Berg, M., Hohm, O. and Samtleben, H., Holography of D-brane reconnection, JHEP 0704 (2007) 013 (hep-th/0612201). – Bilandzic, A. and Prokopec, T., Quantum radiative corrections to slow-roll infla- tion, Phys. Rev. D 76 (2007) 103507 (astro-ph/07041905). – Cardoso, G.L., de Wit, B. and Mahapatra, S., Black hole entropy functions and attractor equations, JHEP 0703 (2007) 085 (hep-th/0612225). – de Leeuw, M., Coordinate Bethe ansatz for the string S-matrix, J. Phys. A 40 (2007) 14413-14432 (hep-th/07052369). – de Vroome, M. and Vandoren, S., Supergravity description of spacetime instantons, Class. Quant. Grav. 24 (2007) 509-534 (hep-th/0607055). – de Vroome, M. and de Wit, B., Lagrangians with electric and magnetic charges of N=2 supersymmetric gauge theories, JHEP 0708 (2007) 064 (hep-th/07072717). – de Wit, B., BPS black holes, Nucl. Phys. Proc. Suppl. 171 (2007) 16-38 (hep- th/07041452). – de Wit, B. and Saueressig, F., Tensor supermultiplets and toric quaternion-K¨ahler 5. Academic publications 61

geometry, Fortsch. Phys. 55 (2007) 699-704 (hep-th/0701223). – de Wit, B., Samtleben, H. and Trigiante, M., The maximal D=4 supergravities, JHEP 0706 (2007) 049 (hep-th/07052101). – Engquist, J., Sundell, P. and Tamassia, L., On singleton composites in non-compact WZW models, JHEP 0702 (2007) 097 (hep/0701051). – Engquist, J., Sundell, J.P. and Tamassia, L., Singleton strings, Fortsch. Phys. 55 (2007) 711-716 (hep-th/0701081). – Engquist, J. and Hohm, O., Higher-spin Chern-Simons theories in odd dimensions, Nucl. Phys. B 786 (2007) 1-25 (hep-th/07053714). – Frixione, S., Laenen, E., Motylinski, P. and Webber, B.R., Angular correlations of lepton pairs from vector boson and top quark decays in Monte Carlo simulations, JHEP 0704 (2007) 081 (hep-ph/0702198). – Hohm, O., Gauged diffeomorphisms and hidden symmetries in Kaluza-Klein the- ories, Class. Quant. Grav. 24 (2007) 2825-2844 (hep-th/0611347). – Huber, S.J., Konstandin, T., Prokopec, T. and Schmidt, M.G., Baryogenesis in the MSSM, nMSSM and NMSSM, Nucl. Phys. A 785 (2007) 206-209. – Janssen, T. and Prokopec, T., Vacuum properties of nonsymmetric gravity in de Sitter space, JCAP 0705 (2007) 010 (gr-qc/0703050). – Janssen, T. and Prokopec, T., Problems and hopes in nonsymmetric gravity, J. Phys. A 40 (2007) 7067-7074 (gr-qc/0611005). – Neitzke, A., Pioline, B. and Vandoren, S., Twistors and black holes, JHEP 0704 (2007) 038 (hep-th/0701214). – Oriti, D., A quantum field theory of simplicial geometry and the emergence of spacetime, J. Phys. Conf. Ser. 67 (2007) 012052 (hep-th/0612301). – Oriti, D., Quantum gravity as a quantum field theory of simplicial geometry, in Quantum Gravity: mathematical methods and experimental bounds, B. Frauser, J. Tolksdorf, E. Zeidler Eds., Birkhauser, Basel (2007) (gr-qc/0512103). – Peeters, K. and Zamaklar, M., The string/gauge theory correspondence in QCD, Eur. Phys. J. Spec. Top. 152 (2007) 113-138 (hep-ph/07081502). – Prokopec, T., Tsamis, N.C. and Woodard, R.P., Two loop scalar bilinears for inflationary SQED, Class. Quant. Grav. 24 (2007) 201-230 (gr-qc/0607094). – Prokopec, T. and Rigopoulos, G.I., Decoherence from Isocurvature perturbations in inflation, JCAP 0711 (2007) 029 (astro-ph/0612067). – Rigopoulos, G.I., Shellard, E.P.S. and van Tent, B.J.W., Quantitative bispectra from multifield inflation, Phys. Rev. D 76 (2007) 083512 (astro-ph/0511041). – Robles-Llana, D., Roˇcek,M., Saueressig, F., Theis, U. and Vandoren, S., Nonper- turbative corrections to 4D string theory effective actions from SL(2,Z) duality and supersymmetry, Phys. Rev. Lett. 98 (2007) 211602 (hep-th/0612027). – Robles-Llana, D., Roˇcek, M., Saueressig, F., Theis, U. and Vandoren, S., Orienti- folding in N=2 superspace, Fortsch. Phys. 55 (2007) 615 (hep-th/0701282). – Sahlmann, H., Exploring the diffeomorphism invariant Hilbert space of a scalar field, Class. Quant. Grav. 24 (2007) 4601-4615 (gr-qc/0609032). – Sahlmann, H., Toward explaining black hole entropy quantization in loop quantum gravity, Phys. Rev. D 76 (2007) 104050 (gr-qc/07092433). – Salim, J.M., Souza, N., Perez Bergliaffa, S.E. and Prokopec, T., Creation of cos- mological magnetic fields in a bouncing cosmology, JCAP 0704 (2007) 011 (astro- 62 Annual report 2007

ph/0612281). – Saueressig, F., Towards the quantum corrected hypermultiplet moduli space, Nucl. Phys. Proc. Suppl. 171 (2007) 313-315. – Saueressig, F. and Vandoren, S., Conifold singularities, resumming instantons and non-perturbative mirror symmetry, JHEP 0707 (2007) 018 (hep-th/07042229). – ’t Hooft, G., The making of the standard model, Nature 448 (2007) 271-273. – ’t Hooft, G., Emergent quantum mechanics and emergent symmetries, AIP Conf. Proc. 957 (2007) 154-163 (hep-th/07074568). – ’t Hooft, G., A mathematical theory for deterministic quantum mechanics, J. Phys: Conf. Ser. 67 (2007) 012015. – ’t Hooft, G., Models for confinement, Progr. Theor. Phys. Suppl. 167 (2007) 144-154.

5.2 Theme 2: Quantum matter, quantum informa- tion, soft condensed matter and biophysics

University of Amsterdam – Allahverdyan, A. and Nieuwenhuizen, T.M., Minimal-work principle and its limits for classical systems, Phys. Rev. E 75(5) (2007) 051124. – Allahverdyan, A., Balian, R. and Nieuwenhuizen, T.M., The quantum measurement process: lessons from an exactly solvable model, in: Beyond the Quantum, Th.M. Nieuwenhuizen, V. Spicka, B. Mehmani, M.J. Aghdami, A.Yu. Khrennikov (Eds.), World Sci. Publ. Co., Singapore (2007) 53-67. – Aquino, G. and Mehmani, B., Simultaneous measurements of non-commuting ob- servables, in: Beyond the Quantum, Th.M. Nieuwenhuizen, V. Spicka, B. Mehmani, M.J. Aghdami, A.Yu. Khrennikov (Eds.), WSPC: World Sci. (2007) 115-125. – Ardonne, E. and Schoutens, K., Wavefunctions for topological quantum registers, Ann. of Phys. 322 (2007) 201-235. – Calabrese, P. and Caux, J.S., Correlation functions of the one-dimensional attract- ive Bose gas, Phys. Rev. Lett. 98 (2007) 150403. – Calabrese, P. and Caux, J.S., Dynamics of the attractive 1D Bose gas: analytical treatment from integrability, J. Stat. Mech.-Theory and Exp. (2007) P08032. – Capel, H.W., Sahadevan, R. and Rajakumar, S., Super integrable four-dimensional autonomous mappings, J. Phys. A: Math. Gen. 40 (20) (2007) 5373-5394. – Caux, J.S., Calabrese, P. and Slavnov, N., One-particle dynamical correlations in the one-dimensional Bose gas, J. Stat. Mech.-Theory and Exp. (2007) P01008. – Cetto, A.M., Balian, R., Hooft, G. ’t, Khrennikov, A.Yu. and Nieuwenhuizen, T.M., Round table discussion at the Lorentz Workshop ‘Beyond the Quantum’, in: Beyond the Quantum, Th.M. Nieuwenhuizen, V. Spicka, B. Mehmani, M.J. Aghdami, A.Yu. Khrennikov (Eds.), World Sci. Publ. Co., Singapore (2007) 377-383. – de Lang, D.T.N., Ponomarenko, L., de Visser, A. and Pruisken, A.M.M., Obser- vation of the quantized Hall insulator in the quantum critical regime of the two- dimensional electron gas, Phys. Rev. B 75 (2007) 35313. 5. Academic publications 63

– Dekker, H., Vibrational dynamics of modern lightrail modules, Arch. Appl. Mech. 77 (2007) 849-859. – Fendley, P. and Schoutens, K., Cooper pairs and exclusion statistics from coupled free-fermion chains, J. Stat. Mech.-Theory and Exp. 0207 (2007) P02017. – Hagemans, R.L. and Caux, J.S., Deformed strings in the Heisenberg model, J. Phys. A: Math. Gen. 40 (2007) 14605-14647. – Haque, M., Zozulya, O.S. and Schoutens, K., Entanglement entropy in fermionic Laughlin states, Phys. Rev. Lett. 98 (2007) 060401. – Kager, W., Reflected Brownian motion in generic triangles and wedges, in: Stoch. Proc. and their Appl. 117 (2007) 539-549. – Leuzzi, L. and Nieuwenhuizen, T.M., Thermodynamics of the glassy state, Taylor and Francis, 2007 (monograph). – Nieuwenhuizen, T.M., Einstein vs. Maxwell: Is gravitation a curvature of space, a field in flat space, or both?, Europhys. Lett. 78(1) (2007) 10010. – Nieuwenhuizen, T.M., Nonequivalence of inertial mass and active gravitational mass, in: G. Adenier, C.A. Fuchs, A.Yu. Khrennikov (Eds.), AIP Conf. Proc. 889, AIP, Melville (2007) 198-207. – Nieuwenhuizen, T.M., The electron and the neutrino as solitons in classical elec- tromagnetism, in: Beyond the Quantum, Th.M. Nieuwenhuizen, V. Spicka, B. Mehmani, M.J. Aghdami, A.Yu. Khrennikov (Eds.), World Sci. Publ. Co., Singa- pore (2007) 332-342. – Nieuwenhuizen, T.M., The pullback mechanism in stochastic electrodynamics, in: Quantum Theory: Reconsideration of Foundations-4, G. Adenier, A.Yu. Khren- nikov, P. Lahti, Vl.I. Man’ko, Th.M. Nieuwenhuizen (Eds.), AIP, Melville (2007) 148. – Nieuwenhuizen, T.M., The relativistic theory of gravitation and its application to cosmology and macroscopic quantum black hole, in: Quantum Theory: Reconsid- eration of Foundations-4 , G. Adenier, A.Yu. Khrennikov, P. Lahti, Vl.I. Man’ko, Th.M. Nieuwenhuizen (Eds.), AIP, Melville (2007) 149-161. – Nieuwenhuizen, T.M. and Volovich, I.V., Role of various entropies in the black hole information loss problem, in: Beyond the Quantum, Th.M. Nieuwenhuizen, V. Spicka, B. Mehmani, M.J. Aghdami, A.Yu. Khrennikov (Eds.), World Sci. Publ. Co., Singapore (2007) 135-146. – Ostojic, S., Vlugt, T.J.H. and Nienhuis, B., Universal anisotropy in force networks under shear, Phys. Rev. E 75(3) (2007) 030301. – Pereira, R.G., Sirker, J., Caux, J.S., Hagemans, R.L., Maillet, J.M., White, S.R. and Affleck, I., Dynamical structure factor at small q for the XXZ spin-1/2 chain, J. Stat. Mech.-Theory and Exp. (2007) P08022. – Pruisken, A.M.M. and Burmistrov, I.S., Theta renormalization, electron-electron interactions and super universality in the quantum Hall regime, Ann. of Phys. 322 (2007) 1265-1334. – Suttorp, L.G., Finite-temperature field theory, spatio-temporal dispersion, J. Phys. A: Math. Gen. 40 (2007) 3697-3719. – Zozulya, O.S., Haque, M., Schoutens, K. and Rezayi, E., Bipartite entanglement entropy in fractional quantum Hall states, Phys. Rev. B 76 (2007) 125310. 64 Annual report 2007

Vrije Universiteit Amsterdam – Brangwynne, C.P., Koenderink, G.H., Barry, E., Dogic, Z., MacKintosh, F.C. and Weitz, D.A., Bending dynamics of fluctuating biopolymers probed by automated high-resolution filament tracking, Biophys. J. 93 (2007) 346. – Brangwynne, C.P., MacKintosh, F.C. and Weitz, D.A., Force fluctuations and polymerization dynamics of intracellular microtubules, PNAS 104 (2007) 16128. – Das, M., MacKintosh, F.C. and Levine, A.J., Effective medium theory of semiflex- ible filamentous networks, Phys. Rev. Lett. 99 (2007) 038101. – Gan, C.H., Gbur, G. and Visser, T.D., Surface plasmons modulate the spatial coherence of light in Young’s interference experiment, Phys. Rev. Lett. 98 (2007) 043908. – Gan, C.H., Gbur, G. and Visser, T.D., A new role for surface plasmons, Optics in 2007 in: Optics and Photonics News, December issue (2007) 36. – Green, K., Krauskopf, B. and Lenstra, D., External cavity mode structure of a two-mode VCSEL subject to optical feedback, Optics Comm. 277 (2007) 359-371. – Green, K., Krauskopf, B. and Lenstra, D., Effects of optical feedback induced mode- coupling in VCSELs, Proceedings of PHASE (2007). – Jabbari-Farouji, S., Mizuno, D., Atakhorrami, M., MacKintosh, F.C., Schmidt, C.F., Eiser, E., Wegdam, G.H. and Bonn, D., Fluctuation-dissipation theorem in an aging colloidal glass, Phys. Rev. Lett. 98 (2007) 108302. – Janmey, P.A., McCormick, M.E., Rammensee, S., Leight, J.L., Georges, P.C. and MacKintosh, F.C., Negative normal stress in semiflexible biopolymer gels, Nature Mat. 6 (2007) 48. – Kuzmin, N., ’t Hooft, G.W., Eliel, E.R., Gbur, G., Schouten, H.F. and Visser, T.D., Enhancement of spatial coherence by surface plasmons, Optics Lett. 32 (2007) 445- 447. – Lin, Y.-C., Koenderink, G.H., MacKintosh, F.C. and Weitz, D.A., Viscoelastic properties of microtubule networks, Macromolecules 40 (2007) 7714. – Liu, J., Koenderink, G.H., Kasza, K.E., MacKintosh, F.C. and Weitz, D.A., Visu- alizing the strain field in semiflexible polymer networks: strain fluctuations and nonlinear rheology of F-actin gels, Phys. Rev. Lett. 98 (2007) 198304. – Mizuno, D., Tardin, C., Schmidt, C.F. and MacKintosh, F.C., Nonequilibrium mechanics of active cytoskeletal networks, Science 315 (2007) 370. – Schoonover, R.W. and Visser, T.D., The power radiated by two correlated sources, Optics Comm. 271 (2007) 323-326.

University of Groningen – van Enter, A.C.D. and Shlosman, S.B., First-order transitions for very nonlinear sigma models, Markov Proc. Rel. Fields, 13/2 (2007) 239-219. – van Enter, A.C.D. and K¨ulske, C., First-order transitions for some generalized XY models, J. Stat. Phys. 126 (2007) 1007-1024. – van Enter, A.C.D. and Ruszel, W.M., Chaotic temperature dependence at zero temperature, J. Stat. Phys. 127 (2007) 567-573. – van Enter, A.C.D. and Hulshof, T., Finite-size effects for anisotropic bootstrap percolation: logarithmic corrections, J. Stat. Phys. 128 (2007) 1383-1389. 5. Academic publications 65

Leiden University – Akhmerov, A.R. and Beenakker, C.W.J., Detection of valley polarization in graphene by a superconducting contact, Phys. Rev. Lett. 98 (15) (2007) 157003. – Akhmerov, A.R. and Beenakker, C.W.J., Pseudodiffusive conduction at the Dirac point of a normal-superconductor junction in graphene, Phys. Rev. B 75 (4) (2007) 045426. – Ament, L.J.P., Forte, F. and van den Brink, J., Ultrashort lifetime expansion for indirect resonant inelastic x-ray scattering, Phys. Rev. B 75 (11) (2007) 115118. – Bardarson, J.H., Tworzydlo, J., Brouwer, P.W. and Beenakker, C.W.J., One- parameter scaling at the Dirac point in graphene, Phys. Rev. Lett. 99 (10) (2007) 106801. – Bardarson, J.H., Adagideli, I. and Jacquod, P., Mesoscopic spin Hall effect, Phys. Rev. Lett. 98 (19) (2007) 196601. – Beri, B., Bardarson, J.H. and Beenakker, C.W.J., Effect of spin-orbit coupling on the excitation spectrum of Andreev billiards, Phys. Rev. B 75 (16) (2007) 165307. – Betouras, J.J., Giovannetti, G. and van den Brink, J., Multiferroicity induced by dislocated spin-density waves, Phys. Rev. Lett. 98 (25) (2007) 257602. – Burkatzki, M., Filippi, C. and Dolg, M., Publisher’s Note: Energy-consistent pseudopotentials for quantum Monte Carlo calculations [J. Chem. Phys. 126 (2007) 234105], J. Chem. Phys. 127 (10) (2007) 109901. – Burkatzki, M., Filippi, C. and Dolg, M., Energy-consistent pseudopotentials for quantum monte Carlo calculations, J. Chem. Phys. 126 (23) (2007) 234105. – Chakraborty, P.B., Denteneer, P.J.H. and Scalettar, R.T., Determinant quantum Monte Carlo study of the screening of the one-body potential near a metal-insulator transition, Phys. Rev. B 75 (12) (2007) 125117. – Cordova, F., Doriol, L.J., Ipatov, A., Casidaa, M.E., Filippi, C. and Vela, A., Troubleshooting time-dependent density-functional theory for photochemical applic- ations: Oxirane, J. Chem. Phys. 127 (16) (2007) 164111. – Depken, M., Lechman, J.B., van Hecke, M., van Saarloos, W. and Grest, G.S., Stresses in smooth flows of dense granular media, EPL 78 (5) (2007) 58001. – Deng, Y.J., Garoni, T.M., Guo, W.N., Bl¨ote,H.W.J. and Sokal, A.D., Cluster simulations of loop models on two-dimensional lattices, Phys. Rev. Lett. 98 (12) (2007) 120601. – Ding, C.X., Deng, Y.J., Guo, W.A., Qian, X.F. and Bl¨ote,H.W., Geometric prop- erties of two-dimensional O(n) loop configurations, J. Phys. A: Math. Theor. 40 (13) (2007) 3305-3317. – Dolcini, F., Trauzettel, B., Safi, I. and Grabert, H., Negativity of the excess noise in a quantum wire capacitively coupled to a gate, Phys. Rev. B 75 (4) (2007) 045332. – Ellenbroek, W.G. and Snoeijer, J.H., Bounds on the shear load of cohesionless granular matter, J. Stat. Mech.-Theory and Exp. (2007) P01023. – Emanuel, M., Mohrbach, H., Sayar, M., Schiessel, H. and Kulic, I.M., Buckling of stiff polymers: influence of thermal fluctuations, Phys. Rev. E 76 (6) (2007) 061907, Part 1. – Giovannetti, G., Khomyakov, P.A., Brocks, G., Kelly, P.J. and van den Brink, J., Substrate-induced band gap in graphene on hexagonal boron nitride: Ab initio 66 Annual report 2007

density functional calculations, Phys. Rev. B 76 (7) (2007) 073103. – Habraken, S.J.M. and Nienhuis, G., Modes of a twisted optical cavity, Phys. Rev. A 75 (2007) 033819. – Karpan, V.M., Giovannetti, G., Khomyakov, P.A., Talanana, M., Starikov, A.A., Zwierzycki, M., van den Brink, J., Brocks, G. and Kelly, P.J., Graphite and graphene as perfect spin filters, Phys. Rev. Lett. 99 (17) (2007) 176602. – Kr¨uger,F., Is deconfined quantum criticality in frustrated antiferromagnets ruled out by generic fluctuation induced first order behavior?, J. Superc. Novel Magn. 20 (7-8) (2007) 575-578. – Kr¨uger,F., Wilson, S.D., Shan, L., Li, S.L., Huang, Y., Wen, H.H., Zhang, S.C., Dai, P.C. and Zaanen, J., Magnetic fluctuations in n-type high-Tc superconductors reveal breakdown of fermiology: experiments and Fermi-liquid/RPA calculations, Phys. Rev. B 76 (9) (2007) 094506. – Kulic, I.M., Mohrbach, H., Thaokar, R. and Schiessel, H., Equation of state of looped DNA, Phys. Rev. E 75 (1) (2007) 011913. – Ludwig, T., Andreev reflection in bilayer graphene, Phys. Rev. B 75 (19) (2007) 195322. – Meevasana, W., Zhou, X.J., Sahrakorpi, S., Lee, W.S., Yang, W.L., Tanaka, K., Mannella, N., Yoshida, T., Lu, D.H., Chen, Y.L., He, R.H., Lin, H., Komiya, S., Ando, Y., Zhou, F., Ti, W.X., Xiong, J.W., Zhao, Z.X., Sasagawa, T., Kakeshita, T., Fujita, K., Uchida, S., Eisaki, H., Fujimori, A., Hussain, Z., Markiewicz, R.S., Bansil, A., Nagaosa, N., Zaanen, J., Devereaux, T.P. and Shen, Z.X., Hierarchy of multiple many-body interaction scales in high-temperature superconductors, Phys. Rev. B 75 (17) (2007) 174506. – Mannella, N., Yang, W.L., Tanaka, K., Zhou, X.J., Zheng, H., Mitchell, J.F., Zaanen, J., Devereaux, T.P., Nagaosa, N., Hussain, Z. and Shen, Z.X., Polaron coherence condensation as the mechanism for colossal magnetoresistance in layered manganites, Phys. Rev. B 76 (2007) 233102. – Morozov, A.N. and van Saarloos, W., An introductory essay on subcritical instabil- ities and the transition to turbulence in visco-elastic parallel shear flows, Phys. Reports - Review Section of Phys. Lett. 447 (3-6) (2007) 112-143. – Mukhin, S.I., Mesaros, A., Zaanen, J. and Kusmartsev, F.V., Enhanced electronic polarizability of metallic stripes and the universality of the bond-stretching phonon anomaly in high-temperature cuprate superconductors, Phys. Rev. B 76 (17) (2007) 174521. – Nienhuis, G., State reduction by measurements with a null result, in: Beyond the Quantum, Theo M. Nieuwenhuizen et al., editors (World Scientific (2007) 80-90. – Nienhuis, G. and Habraken, S.J.M., Structure of cavity modes with general astig- matism, Proceedings of SPIE, Vol. 6483, Complex Light and Optical Forces, David Andrews, Enrique Galvez and Gerard Nienhuis, editors (2007) 64830J-1-12. – Ossipov, A., Titov, M. and Beenakker, C.W.J., Reentrance effect in a graphene n-p-n junction coupled to a superconductor, Phys. Rev. B 75 (24) (2007) 241401. – Panja, D., Barkema, G.T. and Ball, R.C., Anomalous dynamics of unbiased poly- mer translocation through a narrow pore, J. Phys.: Cond. Matter 19 (43) (2007) 432202. – Rusu, P.C., Giovannetti, G. and Brocks, G., Dipole formation at interfaces of 5. Academic publications 67

alkanethiolate self-assembled monolayers and Ag(111), J. Phys. Chem. C111 (39) 14448-14456. – Rycerz, A., Tworzydlo, J. and Beenakker, C.W.J., Anomalously large conductance fluctuations in weakly disordered graphene, EPL 79 (5) (2007) 57003, 1-5. – Rycerz, A., Tworzydlo, J. and Beenakker, C.W.J., Valley filter and valley valve in graphene, Nature Phys. 3 (3) (2007) 172-175. – Sepkhanov, R.A., Bazaily, Y.B. and Beenakker, C.W.J., Extremal transmission at the Dirac point of a photonic band structure, Phys. Rev. A 75 (6) (2007) 063813, 1-5. – Shundyak, K., van Hecke, M. and van Saarloos, W., Force mobilization and gen- eralized isostaticity in jammed packings of frictional grains, Phys. Rev. E 75 (1) (2007) 010301, Part 1. – Silvestrov, P.G. and Ponomarev, I.V., Chaos beyond linearized stability analysis: folding of the phase space and distribution of Lyapunov exponents, Phys. Lett. A 365 (4) (2007) 290-294. – Snyman, I. and Beenakker, C.W.J., Ballistic transmission through a graphene bilayer, Phys. Rev. B 75 (4) (2007) 045322. – Snyman, I. and Nazarov, Y.V., Polarization of a charge qubit strongly coupled to a voltage-driven quantum point contact, Phys. Rev. Lett. 99 (9) (2007) 096802. – Somfai, E., van Hecke, M., Ellenbroek, W.G., Shundyak, K. and van Saarloos, W., Critical and noncritical jamming of frictional grains, Phys. Rev. E 75 (2) (2007) 020301. – Thaokar, R.M., Schiessel, H. and Kulic, I.M., Hydrodynamics of a rotating torus, Eur. Phys. J. B 60 (3) (2007) 325-336. – Titov, M., Ossipov, A. and Beenakker, C.W.J., Excitation gap of a graphene chan- nel with superconducting boundaries, Phys. Rev. B 75 (4) (2007) 045417. – Trauzettel, B., Blanter, Y.M. and Morpurgo, A.F., Photon-assisted electron trans- port in graphene: scattering theory analysis, Phys. Rev. B 75 (3) (2007) 035305. – Tsymbal, L.T., Bazaily, Y.B., Derkachenko, V.N., Kamenev, V.I., Kakazei, G.N., Palomares, F.J. and Wigen, P.E., Magnetic and structural properties of spin- reorientation transitions in orthoferrites, J. Appl. Phys. 101 (12) (2007) 123919, 1-7. – Tworzydlo, J., Snyman, I., Akhmerov, A.R. and Beenakker, C.W.J., Valley-isospin dependence of the quantum Hall effect in a graphene p-n junction, Phys. Rev. B 76 (3) (2007) 035411. – Umrigar, C.J., Toulouse, J., Filippi, C., Sorella, S. and Hennig, R.G., Alleviation of the fermion-sign problem by optimization of many-body wave functions, Phys. Rev. Lett. 98 (11) (2007) 110201. – van den Brink, J., The theory of indirect resonant inelastic X-ray scattering on magnons, EPL 80 (4) (2007) 47003. – van den Brink, J. and Snyman, I., Advancing science in Africa, Nature Mat. 6 (11) (2007) 792-793. – van den Brink, J. and Morpurgo, A.F., Materials science - magnetic blue, Nature 450 (7167) (2007) 177-178. – van den Brink, J., Graphene - from strength to strength, Nature Nanotech. 2 (4) (2007) 199-201. 68 Annual report 2007

– van Eerd, A.R.T., Ellenbroek, W.G., van Hecke, M., Snoeijer, J.H. and Vlugt, T.J.H., Tail of the contact force distribution in static granular materials, Phys. Rev. E 75 (6) (2007) 060302, 1-4. – van Enk, S.J. and Nienhuis, G., Photons in polychromatic rotating modes, Phys. Rev. A 76 (2007) 053825. – van Wezel, J. and van den Brink, J., Limit to manipulation of qubits due to spon- taneous symmetry breaking, J. Magn. and Magn. Mat. 310 (2) (2007) E503-E505. – van Wezel, J. and van den Brink, J., Spontaneous symmetry breaking in quantum mechanics, AJP 75 (7) (2007) 635-638. – Yevtushenko, O. and Ossipov, A., A supersymmetry approach to almost diagonal random matrices, J. Phys. A: Math. Theor. 40 (18) (2007) 4691-4716. – Zaanen, J., Theoretical physics - a black hole full of answers, Nature 448 (7157) (2007) 1000-1001. – Zaanen, J., Watching rush hour in the world of electrons, Science 315 (2007) 1372. – Zaanen, J., Theoretical physics - a black hole full of answers, Nature 448 (2007) 1000.

Radboud University Nijmegen – Ament, L.J.P., Forte, F. and van den Brink, J., Ultrashort lifetime expansion for indirect resonant inelastic x-ray scattering, Phys. Rev. B 75 (2007) 115118. – Auslender, M. and Katsnelson, M.I., Generalized kinetic equations for charge car- riers in graphene, Phys. Rev. B 76 (2007) 235425. – Betouras, J.J., Giovannetti, G. and van den Brink, J., Multiferroicity induced by dislocated spin-density waves, Phys. Rev. Lett. 98 (2007) 257602. – Boukhvalov, D.W., Al-Saqer, M., Kurmaev, E.Z., Moewes, A., Galakhov, V.R., Finkelstein, L.D., Chiuzbaian, S., Neumann, M., Dobrovitski, V.V., Katsnelson, M.I., Lichtenstein, A.I., Harmon, B.N., Endo, K., North, J.M. and Dalal, N.S., Electronic structure of a Mn12 molecular magnet: theory and experiment, Phys. Rev. B 75 (2007) 014410. – Boukhvalov, D.W., Gornostyrev, Yu N., Katsnelson, K.I. and Lichtenstein, A.I., Magnetism and local distortions near carbon impurity in gamma-iron, Phys. Rev. Lett. 99 (2007) 247205. – Boukhvalov, D.W., Katsnelson, M.I. and Lichtenstein, A.I., Hydrogen storage on graphene: first-principle calculations, Phys. Rev. B 77 (2007) 035427. – Chioncel, L., Allmaier, H., Arrigoni, E., Yamasaki, A., Daghofer, M., Katsnelson, M.I. and Lichtenstein, A.I., Half-metallic ferromagnetism and spin polarization in CrO2, Phys. Rev. B 75 (2007) 140406. – Fasolino, A., Los, J.H. and Katsnelson, M.I., Intrinsic ripples in graphene, Nature Matt. 6 (2007) 858-861. – Giesbers, A.J.M., Zeitler, U., Katsnelson, M.I., Ponomarenko, L.A., Mohiuddin, T.M. and Maan, J.C., Quantum-Hall activation gaps in graphene, Phys. Rev. Lett. 99 (2007) 206803. – Giovannetti, G., Khomyakov, P.A., Brocks, G., Kelly, P.J. and van den Brink, J., Substrate-induced band gap in graphene on hexagonal boron nitride: ab initio density functional calculations, Phys. Rev. B 76 (2007) 073103. – Gornostyrev, Y.N., Kontsevoi, O.Y., Khromov, K.Y., Katsnelson, M.I. and Free- 5. Academic publications 69

man, A.J., The role of thermal expansion and composition changes in the tem- perature dependence of the lattice misfit in two-phase gamma/gamma’ superalloys, Scripta Materialia 56 (2007) 81-84. – Grechnev, A., Di Marco, I., Katsnelson, M.I., Lichtenstein, A.I., Wills, J. and Eriksson, O., Theory of bulk and surface quasiparticle spectra for Fe, Co, and Ni, Phys. Rev. B 76 (2007) 035107. – Hafermann, H., Brener, S., Rubtsov, A.N., Katsnelson, M.I. and Lichtenstein, A.I., Cluster dual fermion approach to nonlocal correlations, JETP Lett. 86 (10) (2007) 677-682. – Huisman, B.A.H. and Fasolino, A., Influence of latent heat and thermal diffusion on the growth of nematic liquid crystal nuclei, Phys. Rev. E 76 (2007) 021706. – Irkhin, V.Y., Katsnelson, M.I. and Lichtenstein, A.I., Non-quasiparticle effects in half-metallic ferromagnets, J. Phys.: Cond. Matt. 19 (2007) 315201. – Isaev, E.I., Simak, S.I., Abrikosov, I.A., Ahuja, R., Vekilov, Y.K., Katsnelson, M.I., Lichtenstein, A.I. and Johansson, B., Phonon related properties of transition metals, their carbides, and nitrides: a first-principles study, J. Appl. Phys. 101 (2007) 123519. – Karpan, V.M., Giovannetti, G., Khomyakov, P.A., Talanana, M., Starikov, A.A., Zwierzycki, M., van den Brink, J., Brocks, G. and Kelly, P.J., Graphite and graphene as perfect spin filters, Phys. Rev. Lett. 99 (2007) 176602. – Katsnelson, M.I., Conductance quantization in graphene nanoribbons: adiabatic approximation, Eur. Phys. J. B 57 (2007) 225-228. – Katsnelson, M.I., Scattering of charge carriers by point defects in bilayer graphene, Phys. Rev. B 76 (2007) 073411. – Katsnelson, M.I., and Novoselov, K.S., Graphene: new bridge between condensed matter physics and quantum electrodynamics, Solid State Comm. 143 (2007) 3-13. – Katsnelson, M.I., Graphene: carbon in two dimensions, Materials Today 10 (2007) 20-27. – Manyuhina, O.V., Fasolino, A. and Katsnelson, M.I., Slow dynamics in a model of the cellulose network, Polymer 48 (2007) 4849-4854. – Manyuhina, O.V., Shklyarevskiy, I.O., Jonkheijm, P., Christianen, P.C.M., Fasolino, A., Katsnelson, M.I., Schenning, A.P.H.J., Meijer, E.W., Henze, O., Kilbinger, A.F.M., Feast, W.J. and Maan, J.C., Anharmonic magnetic deformation of self- assembled molecular nanocapsules, Phys. Rev. Lett. 98 (2007) 146101. – Meyer, J.C., Geim, A.K., Katsnelson, M.I., Novoselov, K.S., Booth, T.J. and Roth, S., The structure of suspended graphene sheets, Nature 446 (2007) 60-63. – Meyer, J.C., Geim, A.K., Katsnelson, M.I., Novoselov, K.S., Obergfell, D., Roth, S., Girit, C. and Zettl, A., On the roughness of single- and bi-layer graphene mem- branes, Solid State Comm. 143 (2007) 101-109. – Pijper, E. and Fasolino, A., Quantum surface diffusion of vibrationally excited molecular dimers, J. Chem. Phys. 126 (2007). – Pourovskii, L.V., Kotliar, G., Katsnelson, M.I. and Lichtenstein, A.I., Dynamical mean-field theory investigation of specific heat and electronic structure of alpha- and delta-plutonium, Phys. Rev. B 75 (2007) 235107. – Razumov, I.K., Gornostyrev, Y.N., Yu, N. and Katsnelson, M.I., Intrinsic nanoscale inhomogeneity in ordering systems due to elastic-mediated interactions, 70 Annual report 2007

Europhys. Lett. 80 (2007) 66001. – Rubtsov, A.N., Katsnelson, M.I., Gorelov, E.N. and Lichtenstein, A.I., Kondo effect in mesoscopic system, Electr. Corr. New Matt. and Nano. 241 (2007) 327. – Schedin, F., Geim, A.K., Morozov, S.V., Hill, E.W., Blake, P., Katsnelson, M.I. and Novoselov, K.S., Detection of individual gas molecules adsorbed on graphene, Nature Matt. 6 (2007) 652-655. – Shytov, A.V., Katsnelson, M.I. and Levitov, L.S., Vacuum polarization and screen- ing of supercritical impurities in graphene, Phys. Rev. Lett. 99 (2007) 236802. – Shytov, A.V., Katsnelson, M.I. and Levitov, L.S., Atomic collapse and quasi- Rydberg states in graphene, Phys. Rev. Lett. 99 (2007) 246802. – Souvatzis, P., Eriksson, O. and Katsnelson, M.I., Anomalous thermal expansion in alpha-titanium, Phys. Rev. Lett. 99 (2007) 015901. – van den Brink, J.L., Moorman, P.W., de Boer, M.F., Hop, W.C.J., Pruyn, J.F.A., Verwoerd, C.D.A. and van Bemmel, J.H., Impact on quality of life of a telemedicine system supporting head and neck cancer patients: a controlled trial during the postoperative period at home, JAMIA 14 (2007) 198-205. – van Wezel, J. and van den Brink, J., Limit to manipulation of qubits due to spon- taneous symmetry breaking, J. of Magn. and Magn. Matt. 310 (2007) E503-E505. – van Wezel, J. and van den Brink, J., Spontaneous symmetry breaking in quantum mechanics, AJP 75 (2007) 635-638. – Wehling, T.O., Balatsky, A.V., Katsnelson, M.I., Lichtenstein, A.I., Scharnberg, K. and Wiesendanger, R., Local electronic signatures of impurity states in graphene, Phys. Rev. B 75 (2007) 125425. – Wessely, O., Katsnelson, M.I., Nilsson, A., Nikitin, A., Ogasawara, H., Odelius, M. and Eriksson, O., Dynamical core-hole screening in the x-ray absorption spectra of hydrogenated carbon nanotubes and graphene, Phys. Rev. B 76 (2007) 161402. – Yuan, S., Katsnelson, M.I. and de Raedt, H., Evolution of a quantum spin system to its ground state: role of entanglement and interaction symmetry, Phys. Rev. A 75 (2007) 052109. – Zhuravlev, A.K., Irkhin, V.Y. and Katsnelson, M.I., Role of the d-f Coulomb inter- action in intermediate valence and Kondo systems: a numerical renormalization group study, Eur. Phys. J. B 55 (2007) 377-382.

Utrecht University – Adamska, L., Silva Neto, M.B. and Morais Smith, C., Competing impurities and reentrant magnetism in La2−xSrxCu1−zZnzO4 revisited. The role of the Dzyaloshinskii-Moriya and XY anisotropies, Phys. Rev. B 75 (2007) 134507 (cond- mat/0609653). – Bier, M. and van Roij, R., Relaxation dynamics in fluids of platelike colloidal particles, Phys. Rev. E 76 (2007) 021405 (cond-mat/0705.0104). – Brendel, K., Kuipers, J., Barkema, G.T. and Hoyng, P., An analysis of the fluctu- ations of the geomagnetic dipole, Phys. Earth Planet. Inter. 162 (2007) 249-255 (physics.geo-ph/0707.0623). – Doretto, R.L. and Morais Smith, C., Quantum Hall ferromagnetism in graphene: a SU(4) bosonization approach, Phys. Rev. B 76 (2007) 195431 (cond-mat/0704.3671). 5. Academic publications 71

– Duine, R.A., Haney, P.M., Nunez, A.S. and MacDonald, A.H., Inelastic scattering in ferromagnetic and antiferromagnetic metal spin valves, Phys. Rev. B 75 (2007) 014433 (cond-mat/0610417). – Duine, R.A., Nunez, A.S. and MacDonald, A.H., Thermally-assisted current-driven domain wall motion, Phys. Rev. Lett. 98 (2007) 056605 (cond-mat/0607663). – Duine, R.A., Nunez, A.S., Sinova, J., MacDonald, A.H., Functional Keldysh theory of spin torques, Phys. Rev. B 75 (2007) 214420 (cond-mat/0703414). – Ernst, M.H. and Pagonabarraga, I., The nonlinear fragmentation equation, J. Phys. A: Math. Theor. 40 (2007) F331-F337. – Falco, G.M. and Stoof, H.T.C, Dressed molecules in resonantly-interacting ultracold atomic Fermi gases, Phys. Rev. A 75 (2007) 023612 (cond-mat/0603270). – Gubbels, K.B. and Stoof, H.T.C., Theory for p-Wave Feshbach molecules, Phys. Rev. Lett. 99 (2007) 190406 (cond-mat/0707.3599). – Haney, P.M., Waldron, D., Duine, R.A., Nunez, A.S., Guo, H., MacDonald, A.H., Ab-initio GMR and current-induced torques in Au/Cr multilayers, Phys. Rev. B 75 (2007) 174428 (cond-mat/0611599). – Haney, P.M., Waldron, D., Duine, R.A., Nunez, A.S., Guo, H., MacDonald, A.H., Current induced order parameter dynamics: microscopic theory applied to Co/Cu/Co spin valves, Phys. Rev. B 76 (2007) 024404 (cond-mat/0611534). – Haque, M., Zozulya, O. and Schoutens, K., Entanglement entropy of fermionic Laughlin states, Phys. Rev. Lett. 98 (2007) 060401 (cond-mat/0609263). – Haque, M. and Stoof, H.T.C., Trapped Fermionic clouds distorted from the trap shape due to many-body effects, Phys. Rev. Lett. 98 (2007) 260406 (cond- mat/0701464). – Hemmerich, A. and Morais Smith, C., Exciting a d-density wave in an optical lattice with driven tunneling, Phys. Rev. Lett. 99 (2007) 113002 (cond-mat/0703641). – Leunissen, M.E., Zwanikken, J., van Roij, R., Chaikin, P.M. and van Blaaderen, A., Ion partitioning at the oil-water interface as a source of tunable electrostatic effects in emulsions with colloids, Phys. Chem. Chem. Phys. 9 (2007) 6405. – Makogon, D., Juricic, V. and Morais Smith, C., Transport properties of a quantum wire: the role of extended time-dependent impurities, Phys. Rev. B 75 (2007) 045345 (cond-mat/0609372). – Panja, D., Barkema, G.T. and Ball, R.C., Anomalous dynamics of unbiased poly- mer translocation through a narrow pore, J. Phys.: Condens. Matter 19 (2007) 432202 (cond-mat.soft/0710.0147). – Reich, H., Dijkstra, M., van Roij, R., Schmidt, M., Entropic wetting and the free isotropic-nematic interface of hard colloidal platelets, J. Phys. Chem. B 111 (2007) 7825. – Stoof, H.T.C., A superfluid is born, Nature 447 (2007) 390-391. – Torres, A., Cuetos, A., Dijkstra, M. and van Roij, R., A case study of sedimentation of charged colloids: the primitive model and the effective one-component approach, Phys. Rev. E 75 (2007) 041405 (cond-mat/0702382). – Trizac, E., Barrat, A. and Ernst, M.H., Boltzmann equation for dissipative gases in homogeneous states with non-linear friction, Phys. Rev. E 76 (2007) 031305 (cond-mat/0706.4275). – Trizac, E., Ernst, M.H. and Barrat, A., Quasi elastic solutions to the non-linear 72 Annual report 2007

Boltzmann equation for dissipative gases, J. Phys. A: Math. Gen. 40 (2007) 4057-4073 (cond-mat/0701494). – Villares Ferrer, A. and Morais Smith, C., Dynamical localization of a particle coupled to a two-level system thermal reservoir, Phys. Rev. B 76 (2007) 214303. – Wei, Z., Sharma, A, Nunez, A.S., Haney, P.M., Duine, R.A., Bass, J., MacDonald, A.H. and Tsoi, M., Changing exchange bias in spin valves with an electric current, Phys. Rev. Lett. 98 (2007) 116603 (cond-mat/0606462). – Zwanikken, J. and van Roij, R., Charged colloidal particles and small mobile ions near the oil-water interface: destruction of colloidal double layer and ionic charge separation, Phys. Rev. Lett. 99 (2007) 178301 (cond-mat/0705.2327). 6 Scientific activities

This chapter contains an overview of conference talks, seminars, lecture courses and poster presentations of staff members and postdoctoral fellows. An overview of the presentations of PhD students is given in chapter 3 (sects. 6 and 7). A list of public lectures can be found in chapter 7 (sect. 3)

6.1 Theme 1: Particle physics, cosmology, quantum gravity and string theory

University of Amsterdam – Bais, F.A., Topological quantum computation, 2 lectures, El Escorial Summer School on Quantum Computation and Topological Order, El Escorial, Spain, 16-20 July 2007. – Bais, F.A., Topological symmetry breaking, International Workshop on Topological Quantum Computing, Trinity College, Dublin, Ireland, 12 September 2007. – Bais, F.A., Topological order and computation, Colloquium, Perimeter Institute, Waterloo, Ontario, Canada, 7 November 2007. – Bais, F.A., Topological quantum computation, series of 5 lectures, First Asio- Pacific Summerschool on Mathematical Physics, Australian National University, Canberra, Australia, 26-30 November 2007. – Baptista, Gauge theory and topology, Seminar, University of Bielefeld, Germany, 6 December 2007. – de Boer, J., Black holes and modular invariance, ENS, Paris, France, 11 January 2007. – de Boer, J., Black holes and modular invariance, Durham University, Durham, UK, 19 January 2007. – de Boer, J., Black holes and modular invariance, Swiss Geneziss Meeting, Z¨urich, Switzerland, 2 February 2007. – de Boer, J., Black holes and modular invariance, Swansea University, UK, 23 Feb- ruary 2007. – de Boer, J., Strings, black holes and AdS3, series of 4 lectures, Conference String and M-Theory Approaches to Particle Physics and Cosmology, Florence, Italy, 21-23 March 2007. – de Boer, J., Black holes in string theory, Spring School on Superstring Theory and Related Topics, Trieste, Italy, 22-30 March 2007. – de Boer, J., Black holes in string theory, series of 3 lectures, IPM String School 74 Annual report 2007

and Workshop, Tehran, Iran, 9-18 April 2007. – de Boer, J., Emergence of spacetime and gravitational entropy II, International Sowers Theoretical Physics Workshop 2007 ‘What is String Theory?’, Virginia Tech, Blacksburg, USA, 14-18 May 2007. – de Boer, J., Resolving black holes using AdS/CFT, Strings 2007, Madrid, Spain, 25-29 June 2007. – de Boer, J., Multi-center AdS black holes, International Conference Symmetries of String Theory, Ascona, Switzerland, 26-31 August 2007. – de Boer, J., Supergravity, series of lectures, Joint Amsterdam-Brussels-Paris PhD School, Amsterdam, the Netherlands, 12-30 November 2007. – de Boer, J., Multi-center AdS3 black holes, International Conference Progress of String Theory and Quantum Field Theory, Osaka, Japan, 7-10 December 2007. – de Boer, J., Gravity as an emergent thermodynamic phenomenon, 7a Trobada de Nadal de Fisica Teorica a la Universitat de Barcelona, Spain, 19-20 December 2007. – Britto, R.A.P., Gauge theory scattering amplitudes, Paris-Amsterdam Joint Meet- ing on Holography and Black Holes, Institut Henri Poincare, Paris, France, 5 March 2007. – Britto, R.A.P., Introduction to On-Shell recursions, Workshop Physics at TeV Col- liders, Les Houches Centre de Physique, Paris, France, 26 June 2007. – Britto, R.A.P., 4-dimensional and d-dimensional unitarity constructions, Work- shop Physics at TeV Colliders, Les Houches Centre de Physique, Paris, France, 27 June 2007. – Britto, R.A.P., Amplitude recursions, International Workshop Advancing Collider Physics, Galileo Galilei Institute for Theoretical Physics, Florence, Italy, 5 Septem- ber 2007. – Britto, R.A.P., The simplicity of scattering amplitudes, National Seminar Theor- etical High-Energy Physics, ITFA, University of Amsterdam, the Netherlands, 23 November 2007. – Dijkgraaf, R.H., D-modules and integrable systems, Harvard University, USA, 7 February 2007. – Dijkgraaf, R.H., The unreasonable effectiveness of physics in modern mathemat- ics; The quantum geometry of topological string theory; Quantum field theory, d- modules and integrable systems, series of 3 Eisenbud lectures, 2007 Eisenbud Lec- ture Series in Mathematics and Physics, Brandeis University, USA, 26-31 March 2007. – Dijkgraaf, R.H., The unknown universe, DSM Science & Technology Awards, Brus- sels, Belgium, 5 June 2007. – Dijkgraaf, R.H., Supersymmetric gauge theories, intersecting branes and free fermions, Conference Supersymmetric Gauge Theories, Aspen Center for Physics, Aspen, USA, 2 July 2007. – Dijkgraaf, R.H., String theory and quantum Hall effect, Aspen Center for Physics, Aspen, USA, 3 July 2007. – Dijkgraaf, R.H., D-branes and D-modules, Conference Random and Integrable Models in Mathematics and Physics, Brussels, Belgium, 12 September 2007. – Dijkgraaf, R.H., Van alfa naar b`eta, Antwerpen Summer School, Antwerpen, Bel- gium, 21 September 2007. 6. Scientific activities 75

– Dijkgraaf, R.H., Conformal field theory on quantum Riemann surfaces, Fields, Lattices and Condensed Matter: A Symposium in Honour of John Cardy, Oxford, UK, 15 December 2007. – Kashani-Poor, A.K., The wave function behavior of the open topological string partition function on the conifold, Seminar Harvard University, USA, 2 February 2007. – Kashani-Poor, A.K., The wave function behavior of the open topological string partition function on the conifold, Seminar Rutgers University, New Jersey, USA, 6 February 2007. – Kashani-Poor, A.K., The wave function behavior of the open topological string partition function on the conifold, Seminar University of Chicago, USA, 7 February 2007. – Kashani-Poor, A.K., The wave function behavior of the open topological string partition function on the conifold, Seminar University of Pennsylvania, USA, 12 February 2007. – Kashani-Poor, A.K., Beyond Calabi-Yau reductions, Flux Workshop, DESY, Ham- burg, Germany, 19 February 2007. – Kashani-Poor, A.K., A stringy test of flux-induced isometry gauging, Flux Work- shop, DESY, Hamburg, Germany, 26 February 2007. – Kashani-Poor, A.K., The wave function behavior of the open topological string partition function on the conifold, Seminar Imperial College, London, UK, 9 March 2007. – Kashani-Poor, A.K., Beyond Calabi-Yau reductions, Seminar Liverpool University, UK, 27 March 2007. – Kashani-Poor, A.K., Beyond Calabi-Yau reductions, Seminar Swansea University, UK, 27 April 2007. – Kashani-Poor, A.K., Beyond Calabi-Yau reductions, Seminar Oxford University, UK, 7 May 2007. – Kashani-Poor, A.K., Beyond Calabi-Yau reductions, Simons Workshop, Stony Brook, USA, 7 August 2007. – Kashani-Poor, A.K., Beyond Calabi-Yau reductions, Seminar University of Roma Tor Vergata, Italy, 26 October 2007. – Kashani-Poor, A.K., Nearly Kaehler reduction, Seminar University of Utrecht, the Netherlands, 2 November 2007. – Kashani-Poor, A.K., Nearly Kaehler reduction, Workshop Max-Planck-Institut, M¨unchen, Germany, 16 November 2007. – Laenen, E.L.M.P, QCD at colliders, series of 10 lectures, India School, Harish- Chandra Institute, Allahabad, India, 26-30 November 2007. – Laenen, E.L.M.P, Top quark physics, Inaugural Meeting of German ‘Physics at the Terascale’ Network, DESY, Hamburg, Germany, 5 December 2007. – McFadden, P.L., Colliding branes in heterotic M-theory, International Conference Eurostrings 2007, Crete, Greece, 5 July 2007. – van der Meulen, M.P., Classical approximation to quantum cosmological correla- tions, Dutch Theoretical Cosmology Seminar, University of Amsterdam, the Neth- erlands, 20 April 2007. – van der Meulen, M.P., Classical approximation to quantum cosmological correla- 76 Annual report 2007

tions, International COSMO07 Conference, Brighton, UK, 21 August 2007. – van der Meulen, M.P., Classical approximation to quantum cosmological correla- tions, Theory Seminar at the Laboratoire Astroparticule, Cosmologie (APC), Uni- versit´eParis, France, 16 October 2007. – van der Meulen, M.P., Classical approximation to quantum cosmological correla- tions, NIKHEF Theory Meeting, Amsterdam, the Netherlands, 19 October 2007. – Quella, T., Supersymmetry, supergeometry and physics, KdV Institute, Amster- dam, the Netherlands, 14 March 2007. – Quella, T., Supergroup WZNW models and logarithmic CFT, Arbeitsgemeinschaft Algebraic Structures in Conformal Field Theories, Mathematisches Forschungsin- stitut Oberwolfach, Germany, 2 April 2007. – Quella, T., Conformal field theories with supergroup symmetry, Nineteenth Meeting of the North British Mathematical Physics Seminar, Durham, UK, 7 November 2007. – Quella, T., Conformal field theories with supergroup symmetry, Oxford Mathem- atical Institute, Oxford, UK, 20 November 2007. – Quella, T., Conformal field theories with supergroup symmetry, Isaac Newton In- stitute Program on Strong Fields, Integrability and Strings, Cambridge, UK, 21 November 2007. – Reffert, S., Geometrical aspects of moduli stabilization, High Energy Seminar, SISSA Trieste, Italy, 7 January 2007. – Reffert, S., Strange connections: the dimer model and the rest of the world, The- oretical Physics Seminar, University of Liverpool, UK, 7 February 2007. – Reffert, S., Strange connections: the dimer model and the rest of the world, Theory Seminar, Universit`adel Piemonte Orientale, Alessandria, Italy, 7 April 2007. – Reffert, S., The geometers toolkit to string compactifications, Workshop on String and M Theory Approaches to Particle Physics and Cosmology, GGI, Firenze, Italy, 7 May 2007. – Reffert, S., Categorifying the dimer model: from free fermions to super quantum mechanics, International Conference on Symmetries in String Theory, Ascona, Italy, 7 August 2007. – Reffert, S., Quantum crystal and topological strings, String Theory Seminar, CERN, Geneva, Switzerland, 7 November 2007. – Reffert, S., Quantum crystal and topological strings, String Theory Seminar, Lud- wig Maximilian University, M¨unchen, Germany, 7 December 2007. – van der Schaar, J.P., Backreaction corrections in inflation, Seminar Physics De- partment, Swansea University, Swansea, UK, 1 June 2007. – van der Schaar, J.P., On backreaction (effects) in de Sitter space, Workshop Ini- tial Conditions in Cosmology, International Conference, W¨uerzburg,Germany, 7 September 2007. – Schalm, K.E., Searching for signatures of strings, Seminar Instituut Lorentz, Leiden, 12 April 2007. – Schalm, K.E., Searching for signatures of strings, Colloquium Theoretical Physics, UU, 19 April 2007. – Schalm, K.E., Searching for signatures of strings, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007. 6. Scientific activities 77

– Schalm, K.E., Effective actions for gravity, Workshop String Phenomenology, Galilei Galileo Institute, Firenze, Italy, 8 June 2007. – Schalm, K.E., Universality in AdS/CFT, Workshop Condensed Matter Meets Gravity, Lorentz Center, Leiden, 3 August 2007. – Shigemori, M., Metastable vacua in gauge theory and M-theory - Dijkgraaf-Vara meets Seiberg-Witten in M, Ludwig Maximilian University, M¨unchen, Germany, 8 November 2007. – Shigemori, M., Metastable vacua in gauge theory and M-theory - Dijkgraaf-Vara meets Seiberg-Witten in M, Niels Bohr Institute, University of Copenhagen, Den- mark, 13 December 2007. – Shigemori, M., Metastable vacua in gauge theory and M-theory - Dijkgraaf-Vara meets Seiberg-Witten in M, Paris, France, 20 December 2007. – Shigemori, M., Are there four-dimensional small black rings?, Service de Physique Th´eorique,CEA Saclay, France, 21 December 2007. – Skenderis, K., Introduction to AdS-CFT, series of lectures, DRSTP Postgraduate Course Theoretical High Energy Physics, Andr´eSwieca Summer School, S˜aoPaulo, Brazil, 29 January-2 February 2007. – Skenderis, K., String theory and holographic dualities, DAMTP, Cambridge, UK, 20 February 2007. – Skenderis, K., Holographic anatomy, CPT, Durham, UK, 27 February 2007. – Skenderis, K., Holographic methods and applications to black holes, Ecole Polytech- nique, Paris, France, 5 April 2007. – Skenderis, K., Holographic methods and applications to black holes, SPhT, Saclay, Paris, France, 6 April 2007. – Skenderis, K., Holography and black holes, YITP Anniversary Symposium, SUNY at Stony Brook, USA, 5 May 2007. – Skenderis, K., Holographic methods and applications to black holes, Imperial Col- lege, London, UK, 24 May 2007. – Skenderis, K., Holographic methods and applications to black holes, Fourth Regional Meeting in String Theory, Patras, Greece, 12 June 2007. – Skenderis, K., The domain-wall/cosmology correspondence, Eurostrings 2007, Crete, Greece, 3 July 2007. – Skenderis, K., The fuzzball proposal for black holes, 5th Simons Workshop in Math- ematics and Physics, Stony Brook, USA, 3 August 2007. – Skenderis, K., Holography and the fuzzball proposal for black holes, series of lectures E¨otvos Superstring Workshop 2007, Budapest, Hungary, 3-7 September 2007. – Skenderis, K., BRST quantization of the pure spinor superstring, Programme on Strong Fields, Integrability and Strings, Isaac Newton Institute for Mathematical Sciences, Cambridge, UK, 8 November 2007. – Skenderis, K., Introduction to AdS-CFT correspondence, series of lectures, Joint Amsterdam-Brussels-Paris PhD School, 12-30 November 2007. – Skenderis, K., KK holography and applications, ICTP, Trieste, Italy, 4 December 2007. – Smit, J. Finite-temperature field theory, series of lectures, DRSTP Postgraduate Course Theoretical High Energy Physics, Instituto de F´ısicaTe´orica,Universidade Estadual Paulista, S˜aoPaulo, Brazil, 28 January-10 February 2007. 78 Annual report 2007

– Smit, J., The Anomaly and the Lattice, Symposium Celebrating R.J. Finkelstein’s 90 Birthday, UCLA, Los Angeles, USA, 2 May 2007. – Taylor, M., Holographic in string theory, Colloquium Lorentz Institute, Leiden, the Netherlands, 16 April 2007. – Taylor, M., Holographic anatomy of fuzzballs, Swiss Reginal Meeting, Neuchˆatel, Switzerland, 27 April 2007. – Taylor, M., Holographic anatomy and its applications, Prestrings Conference, Granada, Spain, 20 June 2007. – Taylor, M., Holographic anatomy and the fuzzball proposal, Eurostrings Conference 2007, Crete, Greece, 2 July 2007. – Taylor, M., Holographic anatomy of fuzzballs, Summer Workshop on Black Hole Physics, Paris, France, 21 August 2007. – Taylor, M., The fuzzball proposal for black holes, Workshop Gravity Meets Con- densed Matter, Lorentz Center, Leiden, the Netherlands 31 August 2007. – Taylor, M., Black hole deconstruction, Strong Fields, Integrability and Strings, Isaac Newton Institute, Cambridge, UK, 9 November 2007. – Taylor, M., Black holes in string theory, series of lectures, Joint Amsterdam- Brussels-Paris PhD School, 12-30 November 2007. – Verlinde, E.P., The matrix big bang and emergent space time, Workshop on Space- Time Singularities, KITP, University of California, Santa Barbara, USA, 15 Janu- ary 2007. – Verlinde, E.P., String theory: what has been achieved!, evening discussion with Lee Smolin, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 30 May 2007. – Verlinde, E.P., Counting N=4 dyons and marginal stability, Meeting Black Holes and Modular Forms, Ecole Normale Sup´erieure,Paris, France, 16 August 2007. – Verlinde, E.P., Gravity and strings as emergent phenomena, Meeting Enraging Ideas in Physics, Utrecht University, the Netherlands, 7 September 2007. – Verlinde, E.P., Transport coefficients and holographic renormalization, Miami 2007, Meeting String Theory and AdS/CFT, Fort Lauderdale, USA, 17 December 2007.

Vrije Universiteit Amsterdam – Bakker, B.L.G., Properties of the heavy-ligt mesons from the field-correlator method, TNT seminar, Raleigh, North Carolina, USA, 19 March 2007. – Bakker, B.L.G., Light-front singularities of the double-box diagram, Light-Cone 2007, Columbus, Ohio, USA, 14 May 2007. – Bakker, B.L.G., Spectrum and decay constant of heavy-light mesons, European Few-Body Conference, Pisa, Italy, 13 September 2007. – Bakker, B.L.G., Light-front singularites of the double-box diagram, Light-Front Meeting, Sete, France, October 2007. – Boer, D., Spin physics - session summary, 15th International Workshop on Deep- Inelastic Scattering and Related Subjects (DIS2007), Munich, Germany, 20 April 2007. – Boer, D., QCD spin physics - a theoretical overview, Seminar at NTNU, Trondheim, Norway, 7 June 2007. – Boer, D., Scale dependence of azimuthal asymmetries involving TMDs, Workshop 6. Scientific activities 79

Hard QCD with Antiprotons at GSI FAIR, ECT*, Trento, Italy, 16-20 July 2007. – Boer, D., Theory of transversity, Workshop Hard QCD with Antiprotons at GSI FAIR, ECT*, Trento, Italy, 16-20 July 2007. – Boer, D., When collinear factorization fails - an anomalous asymmetry in Drell- Yan, Seminar at NIKHEF, Amsterdam, the Netherlands, 19 October 2007. – Mulders, P.J., Appearance of single spin asymmetries in hard scattering processes, Workshop Transverse Momentum, Spin and Position Distributions of Partons in Hadrons, Trento, Italy, 11-15 June 2007. – Mulders, P.J., Transverse spin physics, Lectures for RIKEN Spinfest, Tsukuba, Japan, 25-29 June 2007. – Utermann, A., Confronting phenomenological dipole cross-sections with nonlinear evolution, Workshop High Energy QCD: From RHIC to LHC ECT, Trento, Italy, 9-13 January 2007. – Utermann, A., x-Evolution of Phenomenological Dipole Cross Sections, 15th Inter- national Workshop on DIS2007, Munich, Germany, 16-20 April 2007. – Utermann, A., Geometric scaling at RHIC and LHC, Brookhaven National Labor- atory, Upton, New York, USA, 4 December 2007. – Utermann, A., Geometric scaling at RHIC and LHC, Ohio State University, Colum- bus, Ohio, USA, 4 December 2007.

University of Groningen – Bergshoeff, E., Seven-branes, instantons and supersymmetry, London, UK, January 2007. – Bergshoeff, E., E11 from a supergravity point of view, Workshop String and M Theory Approaches to Particle Physics and Cosmology, Florenze, Italy, April 2007. – Bergshoeff, E., What can we learn about supergravity from E11?, Pre-strings Work- shop on Gravitational Aspects of Strings and Branes, Granada, Spain, June 2007. – Bergshoeff, E., What can we learn about supergravity from E11?, Istanbul 2007 Conference on Strings, Branes and Cosmology, Ko¸cUniversity, Istanbul, Turkey, July 2007. – Bergshoeff, E., What can we learn about supergravity from E11?, International Conference on Symmetries in String Theory, Ascona, Switzerland, August 2007. – Bergshoeff, E., The Kac-Moody approach to supergravity, Pisa, Italy, October 2007. – Bergshoeff, E., The Kac-Moody approach to supergravity, Amsterdam, the Nether- lands, October 2007. – Bergshoeff, E., The Kac-Moody approach to supergravity Topical Conference on Ele- mentary Particles, Astrophysics and Cosmology, Fort Lauderdale, USA, December 2007. – Bergshoeff, E., A Q-world of branes, XIIIth IFT-UAM/CSIC Christmas Workshop, Madrid, Spain, December 2007. – de Roo, M., D = 11 supergravity and E11, 21st Nordic Network Meeting on Strings, Fields and Branes, Stockholm, Sweden, 16 February 2007. – de Roo, M., D = 11 and E11, National Seminar on Theoretical High Energy Physics, Amsterdam, the Netherlands, 30 March 2007. 80 Annual report 2007

Leiden University – Ach´ucarro,A., Semilocal string networks, Journees Tourangelles de Relativite, Tours, France, 30 May 2007. – Ach´ucarro,A., Cosmology with strings attached, European Women in Mathematics EWM07, Cambridge, UK, 6 September 2007. – Ach´ucarro,A., F-term uplifting and de Sitter vacua revisited in N=2, Supergrav- ity, Strings and Superstrings in Observational Cosmology, APC Paris, France, 13 December 2007. – Jeannerot, R., Neutrinos from inflation and cosmic strings, 9th APP Symposium, Groningen, the Netherlands, 12 October 2007. – Jeannerot, R., Cosmic strings in unified field theories: CMB anisotropies and lepto- genesis, Strings and Superstrings in Observational Cosmology, APC Paris, France, 11 December 2007. – Schalm, K., AdS/CFT for RHIC Physics: a motivational introduction, Workshop Flow in AdS/CFT, NIKHEF, Amsterdam, the Netherlands, 13 October 2007. – van Baal, P., Calorons and their fermions - a review, Workshop on Fermions and Extended Objects on the Lattice, Benasque, Spain, 28 February 2007. – van Baal, P., Calorons as a challenge in lattice QCD, Seminar Graduate Day of the Karl-Franzens Universit¨at,Graz, Austria, 15 June 2007. – van Baal, P., Calorons with non-trivial holonomy, Seminar Strong Fields, Integ- rability and Strings, Newton Institute, Cambridge, UK, 14 September 2007. – van Baal, P., Calorons with non-trivial holonomy, Classical Field Theory Work- shop, Durham, UK, 20 September 2007.

Radboud University Nijmegen – Beenakker, W., Physics at the LHC: the theoretical challenge, NNV Fall Meeting, Lunteren, the Netherlands, 9 November 2007.

Utrecht University – Alday, F., On the strong coupling scaling dimension of high spin operators, Institute for Advanced Study, Princeton, USA, 20 April 2007. – Alday, F., Gluon scattering amplitudes at strong coupling, Caltech, Los Angeles, US, 25 May 2007. – Alday, F., Gluon scattering amplitudes at strong coupling, UCLA, Los Angeles, US, 30 May 2007. – Alday, F., Gluon scattering amplitudes at strong coupling, KITP, UCSB, Santa Barbara, USA, 31 May 2007. – Alday, F., Gluon scattering amplitudes at strong coupling, ENS, Paris, France, 21 June 2007. – Alday, F., Gluon scattering amplitudes at strong coupling, London Mathemat- ical Society Durham Symposium: Twistors, Strings and Scattering Amplitudes, Durham, UK, 21 August 2007. – Alday, F., Gluon scattering amplitudes at strong coupling, RTN Workshop The Quantum Structure of Spacetime and the Geometric Nature of Fundamental In- teractions, Valencia, Spain, 5 October 2007. – Alday, F., Scattering amplitudes via AdS/CFT, Cambridge University, Cambridge, 6. Scientific activities 81

UK, 17 October 2007. – Alday, F., Scattering amplitudes via AdS/CFT, Queen Mary, London, UK, 18 October 2007. – Alday, F., Scattering amplitudes via AdS/CFT, GeNeZiSS meeting, Z¨urich, Switzerland, 2 November 2007. – Alday, F., Scattering amplitudes via AdS/CFT, NBI, Copenhagen, Denmark, 13 November 2007. – Alday, F., Scattering amplitudes via AdS/CFT, Brown University, Providence, USA, 26 November 2007. – Alday, F., Scattering amplitudes via AdS/CFT, MIT, Cambridge, USA, 28 Novem- ber 2007. – Alday, F., Scattering amplitudes via AdS/CFT, Princeton University, Princeton, USA, 4 December 2007. – Alday, F., Scattering amplitudes via AdS/CFT, Integrability and the Gauge/String Correspondence Workshop, Cambridge, UK, 12 December 2007. – Ambjørn, J., Quantum gravity, Krakow School of Quantum Gravity, 26 March-6 April 2007. – Ambjørn, J., ZZ-branes in random matrix theory, Random Matrix Theory: From Fundamental Physics to Application, 2-6 May 2007, Krakow, Poland, 3 May 2007. – Ambjørn, J., Quantum gravity as a nonperturbative sum over histories, Loops ’07 Conference, 25-30 June 2007, Morelia, Mexico, 26 June 2007. – Ambjørn, J., The emergence of deSitter space, MPI, Leipzig, Germany, 7 June 2007. – Ambjørn, J., The emergence of spacetime from quantum fluctuations, PI07, Path Integrals: New Trends and Perspectives, 23-28 September 2007, MPI, Dresden, Germany, 27 September 2007. 5 – Arutyunov, G., S-matrix for strings in AdS5 S , moderating the Working Group Integrability in AdS/CFT at RTN Winter School× on Strings, Supergravity and Gauge Theories, 15-19 January 2007, CERN, Geneve, Switzerland, 18 January 2007. 5 – Arutyunov, G., The Faddeev-Zamolodchikov algebra for AdS5 S superstring, Institute for Theoretical Physics, Utrecht, the Netherlands, 12 February× 2007. – Arutyunov, G., The S-matrix of AdS/CFT: string-theoretical point of view, Na- tional High Energy Physics Seminar, NIKHEF, Amsterdam, the Netherlands, 30 March 2007. – Arutyunov, G., The S-matrix of AdS/CFT, ENS, Lyon, France, 10 May 2007. – Arutyunov, G., In quest for the S-matrix of AdS/CFT, DRSTP Symposium Trends in Theory 2007, 31 May-1 June 2007, Dalfsen, the Netherlands, 31 May 2007. 5 – Arutyunov, G., Zamolodchikov-Faddeev algebra for AdS5 S superstring, Confer- ence Supersymmetry and Integrability, May 31-June 2, 2007,× Strasbourg, France, 1 June 2007. 5 – Arutyunov, G., Zamolodchikov-Faddeev algebra for AdS5 S superstring, Work- shop Integrability in Gauge and String Theory, 18-22 June× 2007, SPhT Saclay, France, 19 June 2007. – Arutyunov, G., Integrability in AdS/CFT, DESY Theory Workshop 2007 Quantum Chromodynamics: String Theory Meets Collidor Physics, 25-28 September 2007, 82 Annual report 2007

Hamburg, Germany, 25 September 2007. – Arutyunov, G., Integrability, ENS, Pisa, Italy, 6 November 2007. – Arutyunov, G., The S-matrix of AdS/CFT, ENS, Pisa, Italy, 8 November 2007. – de Wit, B., Entropy of BPS black holes, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil / Swieca School, S˜aoPaulo, (10 lectures and 4 tutorials), 28 January-10 February 2007. – de Wit, B., Black holes and strings, Istanbul, Bogazi¸ciUniversity, Istanbul, Turkey, 5 March 2007. – de Wit, B., Black hole entropy, Feza G¨urseyInstitute, Istanbul, Turkey, 8 March 2007. – de Wit, B., Probing degrees of freedom of M-theory, Workshop String Theory: Achievements and Perpsectives, Hebrew University, Jerusalem, Israe¨el,17 April 2007. – de Wit, B., Probing M-theory degrees of freedom, Workshop String and M-Theory Approaches to Particle Physics and Cosmology, Galilei Institute, Firenze, Italy, 2 May 2007. – de Wit, B., Black hole entropy, partition functions and duality, Paris Opening Lecture, ENS Summer Institute on Black Holes, Black Rings, and Modular Forms, 3 August 2007. – de Wit, B., Maximal supergravities and M-theory degrees of freedom, Mathemat- ical Society Durham Symposium, Twistors, Strings and Scattering Amplitudes, London, UK, 23 August 2007. – de Wit, B., Non-holomorphic deformation of special geometry?, Luciano Girardello Fest, Milano, Italy, 23 November 2007. – Eden, B., Integrability, transcendentality, and crossing, LAPTH Annecy, France, 11 January 2007. – Eden, B., Integrability, transcendentality, and crossing, Queen Mary, University of London, UK, 21 March 2007. – Eden, B., Integrability, transcendentality, and crossing, Department of Mathemat- ics, Durham, UK, 25 May 2007. – Eden, B., Non-perturbative anomalous dimension for twist operators in N=4 SYM, 9th Workshop on Non-Perturbative QCD, 4-8 June 2007, Paris, France, 4 June 2007. – Eden, B., The BES equation and its strong coupling limit, 12th Itzykson Meeting, 18-22 June 2007, Paris, France, 20 June 2007. – Eden, B., The BES equation and its strong coupling limit, SQS 07, 30 July-4 August 2007, Dubna, Russia, 4 August 2007. – Ernst, M., Kinetic theories of complex systems, Norwegian University of Science and Technology (NTNU), Trondheim, Norway, September-October 2007. – Henson, J. Large-scale physics from causal dynamical triangulations, Loops ’07 Conference, 25-30 June 2007, Morelia, Mexico, 29 June 2007. – Hohm, O., Higher-spin Chern-Simons theories, Theoretical Particle Physics Sem- inar, University of Brussels, Belgium, 23 May 2007. – Hohm, O., Higher-spin Chern-Simons theories, String Theory Seminar, University of Hamburg, Germany, 30 May 2007. – Hohm, O., Higher-spin Chern-Simons theories, University of Groningen, 6. Scientific activities 83

the Netherlands, 7 June 2007. – Hohm, O., Higher-spin Chern-Simons theories, Institute for Theoretical Physics, Utrecht, the Netherlands, 15 June 2007. – Konopka, T., Experimental search for quantum gravity, Institute for Theoretical Physics, Utrecht, the Netherlands, 15 November 2007. – Konopka, T., A model for emergent space, Institute for Theoretical Physics, Utrecht, the Netherlands, 3 December 2007. – Krishnaswami, G., Naturalness and a line of fixed points in a 4d O(N) scalar field model, Los Alamos T-8 Seminar, Los Alamos National Lab, USA, 22 January 2007. – Krishnaswami, G., Naturalness in scalar field theory, University of Rochester, USA, 1 February 2007. – Krishnaswami, G., Scale invariance and naturalness in a 4d O(N) scalar field model, IMSc (Matscience), Chennai, India, 15 February 2007. – Krishnaswami, G., Baryon in the large-N limit of 1 + 1 QCD, IMSc (Matscience), Chennai, India, 19 February 2007. – Krishnaswami, G., Approximation methods for large-N matrix models, Chennai Math Institute, Chennai, India, 20 February 2007. – Krishnaswami, G., Approximation methods for large-N matrix models, Max Planck Institute for Mathematics, Bonn, Germany, 16 March 2007. – Krishnaswami, G., Large-N matrix models, Physics Institute, Bonn University, Bonn, Germany, 2 July 2007. – Krishnaswami, G., Rigid body in classical mechanics, IMSc (Matscience), Chennai, India, 28 August 2007. – Krishnaswami, G., Rigid body in classical mechanics, Chennai Mathematical Insti- tute, Chennai, India, 30 August 2007. – Krishnaswami, G., Scale invariance and naturalness in a 4d O(N) scalar field model, Raman Research Institute, Bangalore, India, 6 September 2007. – Laenen, E., The phenomenology of particle physics, Shell-FOM Workshop, Shell, Rijswijk, the Netherlands, 10 January 2007. – Laenen, E., The standard model, the cosmos and the LHC, Bogazici University, Istanbul, Turkey, 28 February 2007. – Laenen, E., Resummation, Feza Gursey Institute, Istanbul, Turkey, 9 March 2007. – Laenen, E., Physics of the LHC, University of Iceland, Reykjavik, Iceland, 28 March 2007. – Laenen, E., Top quarks from Stony Brook to the LHC, YITP 40th birthday Sym- posium, Stony Brook, USA, 4 May 2007. – Laenen, E., Theory for the LHC, DRSTP Symposium Trends in Theory 2007, 31 May-1 June 2007, Dalfsen, the Netherlands, 31 May 2007. – Laenen, E., Top quark physics, Inaugural Meeting of German “Physics at the Teras- cale” Network DESY, 3-5 December 2007, DESY, Hamburg, Germany, 5 December 2007. – Laenen, E., QCD at colliders Allahabad, India School Harish-Chandra Institute, 26-30 November 2007. – Loll, R., Quantum structure of spacetime: a sneak preview, Vrije Universiteit Am- sterdam, the Netherlands, 17 January 2007. – Loll, R., Quantum structure of spacetime: a sneak preview, Groningen University, 84 Annual report 2007

the Netherlands, 25 January 2007. – Loll, R., Rederiving spacetime from quantum bits, Imperial College, London, UK, 13 March 2007. – Loll, R., Causal dynamical triangulations as pathway to quantum gravity, Dortmund University, Germany, 8 May 2007. – Loll, R., The quantum structure of spacetime, 12th Canadian Conference on Gen- eral Relativity and Relativistic Astrophysics, Fredericton, New Brunswick, Canada, 17 May 2007. – Loll, R., Quantum gravity for realists, Vienna Symposium on the Foundations of Modern Physics, Vienna, Austria, 7 June 2007. – Loll, R., Emergence of spacetime, or, quantum gravity on your desktop, 18th In- ternational Conference on General Relativity and Gravitation, Sydney, Australia, 8 July 2007. – Loll, R., What you always wanted to know about quantum gravity, Summerschool Theoretical Physics, Utrecht, the Netherlands, 23 August 2007. – Loll, R., A quantum gravitationalist’s take on “emergence”, Workshop Condensed Matter Meets Gravity, Lorentz Center, Leiden, the Netherlands, 27 August 2007. – Loll, R., Dynamical emergence of spacetime, Heidelberg University, Germany, 22 November 2007. – Miao, S.-P., An investigation of late time effects of quantum gravity on fermions during inflation, Institute for Theoretical Physics, Utrecht, the Netherlands, 29 October 2007. – Oriti, D., Group field theories and the emergence of spacetime, ENS, Lyon, France, 25 January 2007. – Oriti, D., Whence the continuum? A group field theory perspective on spacetime, Institute for Theoretical Physics, Utrecht, the Netherlands, 15 February 2007. – Oriti, D., Quantum gravity as a quantum field theory of simplicial geometry, MPI for Mathematics, Bonn, Germany, 23 February 2007. – Oriti, D., Group field theories, or the combinatorial and group-theoretic path to quantum gravity, Workshop Combinatorics and Physics, 19-23 March 2007, MPI for Mathematics, Bonn, Germany, 19 March 2007. – Oriti, D., Group field theory as the microscopic quantum description of the space- time fluid, Workshop From Quantum to Emergent Gravity: Theory and Phenomen- ology, 11-15 June 2007, SISSA, Trieste, Italy, 12 June 2007. – Oriti, D., Group field theories: quantum spacetime from microscopic discreteness to an emergent continuum, Loops ’07 Conference, 25-30 June 2007, Morelia, Mexico, 28 June 2007. – Paredes, A., A string approach to QCD chiral symmetry breaking, Institute for Theoretical Physics, Utrecht, the Netherlands, 19 October 2007. – Peeters, K., String methods for strongly coupled particle physics, CPT Colloquium, Durham, UK, 30 January 2007. – Peeters, K., Dyonic instantons and motion on moduli spaces with potentials, Durham, UK, 31 January 2007. – Peeters, K., The String/gauge theory correspondence in QCD, Schladming Winter School on Theoretical Physics, Austria, 24 February-3 March 2007. – Peeters, K., Hot and dense holographic mesons, Isaac Newton Institute Workshop 6. Scientific activities 85

Strong Fields, Integrability and Strings, 17-27 September 2007, Cambridge, UK, 5 September 2007. – Peeters, K., Holographic skyrmions, Classical Field Theory Workshop, Durham, UK, 20 September 2007. – Peeters, K., Holographic models for hot and dense QCD, DESY Theory Workshop, 25-28 September 2007, DESY, Hamburg, Germany, 26 September 2007. – Peeters, K., Holographic mesons and skyrmions, Edinburgh University, UK, 3 Oc- tober 2007. – Prokopec, T., Decoherence of cosmological perturbations, University of Manchester, UK, 20 March 2007. – Prokopec, T., Leptogenesis and the baryon asymmetry of the universe, XIX`emes Rencontres de Blois: Matter and Energy of the Universe: from Nucleosynthesis to Cosmology, 20-26 May 2007, Blois, France, 23 May 2007. – Prokopec, T., Massive antisymmetric tensor field as dark matter, COSMO07, 21-25 August 2007, University of Sussex, Brighton, UK, 22 August 2007. – Prokopec, T., Review of baryogenesis (in Croatian: Pregled Bariogeneze), 5th Meet- ing of the Croatian Physical Society, Primoˇsten,Croatia, 5-8 October 2007. – Prokopec, T., Decoherence of cosmological perturbations, Institute Rudjder Boˇskovi´c, Zagreb, Croatia, 10 October 2007. – Prokopec, T., Antisymmetric tensor field as dark matter, Physics Department, University of Zagreb, Croatia, 11 October 2007. – Prokopec, T., Graceful exit from inflation and dark energy, NIKHEF Jamboree, Amsterdam, the Netherlands, 18 December 2007. – Pushkina, I., Numerical study of geometrical objects in quantum gravity, Hiroshima University, Japan, 3 May 2007. – Sahlmann, H., The space of spatially diffeomorphism invariant states in loop quantum gravity, Institute for Theoretical Physics, Utrecht, the Netherlands, 24 May 2007. – Sahlmann, H., Metric independent path integrals of connections, Max Planck In- stitute for Mathematics in the Sciences, Leipzig, Germany, 30 May 2007. – Sahlmann, H., Exploring the diffeomorphism invariant Hilbert space, Loops ’07 Conference, 25-30 June 2007, Morelia, Mexico, 26 June 2007. – Sahlmann, H., Toy black holes and entropy quantization in LQG, Penn State Uni- versity, State College, Pensylvania, USA, 28 September 2007. – Sahlmann, H., Toy black holes and entropy quantization in LQG, Perimeter Insti- tute, Waterloo, Canada, 11 October 2007. – Sahlmann, H., Toy black holes and entropy quantization in LQG, Institut f¨urThe- oretische Physik/DESY, Hamburg, Germany, 15 November 2007. – Sahlmann, H., Toy black holes and entropy quantization in LQG, Institute for the Structure of Matter, Madrid, Spain, 12 December 2007. – Saueressig, F., Towards the quantum corrected hypermultiplet moduli space, Uni- versity of Groningen, the Netherlands, 8 February 2007. – Saueressig, F., Towards the quantum corrected hypermultiplet moduli space, Work- shop on Generalized Geometry and Flux Compactifications, Hamburg, Germany, 21 February 2007. – Saueressig, F., Orientifolding in N=2 superspace, XIX Workshop Beyond the Stand- ard Model, Bad Honnef, Germany, 14 March 2007. 86 Annual report 2007

– Saueressig, F., Instanton corrected hypermultiplet moduli spaces, European Physical Society HEP 2007 Conference, Manchester, UK, 20 July 2007. – Saueressig, F., Renormalization group improved cosmologies, 394th Heraeus Sem- inar on Cosmology of Fundamental Interactions, Bad Honnef, Germany, 26 July 2007. – Saueressig, F., Instanton corrected hypermultiplet moduli spaces, V Simons Work- shop in Mathematics and Physics, Stony Brook, USA, 7 August 2007. – ’t Hooft, G., Demystifying quantum mechanics - will there be hints from LHC? CERN, Geneve, Switzerland, 11 January 2007. – ’t Hooft, G., Feynmann rules and unitarity, (course of 5 lectures), XIV Escola de Ver˜aoJorge Andr´eSwieca de Particulas e Campos (2nd week)/DRSTP Post- graduate Courses (1st week), Campos do Jord˜ao,S˜aoPaulo, Brazil, 29 January-2 February 2007. – ’t Hooft, G., An instability in the baryonic string, DRSTP Postgraduate Course Theoretical High Energy Physics, S˜aoPaulo, Brazil, 28 January-10 February 2007. – ’t Hooft, G., A mathematical basis for deterministic quantum mechanics, CBPF, Rio de Janeiro, Brasil, 6 February 2007. – ’t Hooft, G. Emergent quantum mechanics and emergent symmetries, 13th Interna- tional Symposium on Particles, Strings and Cosmology, PASCOS, Imperial College, London, UK, 6 July 2007. – ’t Hooft, G., Salam and the grand view of physics, Salam+50 Conference, Imperial College, London, UK, 7 July 2007. – ’t Hooft, G., Unitarity in the Brout-Englert-Higgs mechanism for gravity, Subnuc- lear School Waiting for the Unexpected, Erice, Italy, 6 September 2007. – ’t Hooft, G., Unitarity in the Brout-Englert-Higgs mechanism for gravity, Institute for Theoretical Physics, ETH, Z¨urich, Switzerland, 26 September 2007. – ’t Hooft, G., Deterministic quantum mechanics, The Z¨urich Physics Colloquium, Z¨urich, Switzerland, 26 September 2007. – ’t Hooft, G., Unitarity in the Brout-Englert-Higgs mechanism for gravity, Institute for Theoretical Physics, Utrecht, the Netherlands, 3 October 2007. – ’t Hooft, G., The quantum structure of the black hole horizon, Institut f¨urMath- ematik, Humboldt University, Berlin, Germany, 1 November 2007. – ’t Hooft, G., The quantum, general relativity, and determinism, Humboldt Univer- sity, Berlin, Germany, 2 November 2007. – ’t Hooft, G., On black holes, Dublin Trinity College, 13 November 2007. – ’t Hooft, G., Unitarity in the Brout-Englert-Higgs mechanism for gravity, National Seminar, Amsterdam, the Netherlands, 23 November 2007. – Vandoren, S., Orientifolding in N=2 superspace, Workshop on Generalized Geo- metry and Flux Compactifications, Hamburg, Germany, 21 February 2007. – Vandoren, S., Exact results in four-dimensional nonperturbative string theory, Swansea University, Swansea, Wales, UK, 9 March 2007. – Vandoren, S., Instanton corrections to hypermultiplet moduli spaces, Workshop on String and M-Theory Approaches to Particle Physics and Cosmology, Galileo Galilei Institute, Florence, Italy, 8 May 2007. – Vandoren, S., A report on the Strings 2007 conference, Institute for Theoretical Physics, Utrecht, the Netherlands, 2 July 2007. 6. Scientific activities 87

– Vandoren, S., Black holes and twistors, Workshop on Black Holes and Automorphic Forms, ENS Paris, France, 24 August 2007. – Vandoren, S., Membrane instantons from mirror symmetry, International Confer- ence on Symmetries of String Theory, Ascona, Switzerland, 31 August 2007. – Vandoren, S., Nonperturbative string theory and the cosmological constant, Ehren- fest Colloquium, Leiden, the Netherlands, 10 October 2007. – Vandoren, S., NS5-brane instantons and volume stabilization, Torino University, Torino, Italy, 25 October 2007. – Vandoren, S., Instantons in N=2 D=4 string compactifications, Workshop on String Effective Actions and D-Instantons, Max Planck Institute, Munich, Germany, 14 November 2007.

6.2 Theme 2: Quantum matter, quantum informa- tion, soft condensed matter and biophysics

University of Amsterdam – Caux, J.-S., The dynamics of Heisenberg spin chains and 1d Bose gases, Seminar Brookhaven National Laboratory, USA, 28 February 2007. – Caux, J.-S., The dynamics of Heisenberg spin chains, March Meeting American Physical Society, Denver, USA, 8 March 2007. – Caux, J.-S., Dynamical correlation functions of the 1d Bose gas (Lieb-Liniger model), March Meeting American Physical Society, Denver, USA, 9 March 2007. – Caux, J.-S., The dynamics of quantum spin chains and 1d Bose gas, Seminar Glasgow University, Glasgow, UK, 16 April 2007. – Caux, J.-S., The dynamics of quantum spin chains and 1d Bose gases, Seminar Herriott-Watt University, Edinburgh, UK, 18 April 2007. – Caux, J.-S., The dynamics of quantum spin chains and 1-d Bose gases, series of lec- tures, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 – Caux, J.-S., The 1D Bose gas: new results from integrability, Workshop Quantum Gases, Institut Henri Poincar´e,Paris, France, 3 May 2007. – Caux, J.-S., The dynamics of quantum spin chains and 1d Bose gases, Seminar Orsay, Paris, France, 3 May 2007. – Caux, J.-S., The dynamics of Heisenberg spin chains (and of the 1d Bose gas), Workshop Highly Frustrated Magnets, ICTP Trieste, Italy, 8 August 2007. – Caux, J.-S., The dynamics of Heisenberg spin chains and 1d Bose gases, Workshop Strong Correlations in Low Dimensional Transport and Dynamics, Montauk, USA, 5 September 2007. – Caux, J.-S., The dynamics of Heisenberg spin chains and 1d Bose gases, Confer- ence Advances in Quantum Integrable Systems (RAQIS’07), University of Annecy, France, 11 September 2007. – Caux, J.-S., The 1D Bose gas: new results from integrability, Workshop Disorder in Condensed Matter and Cold Atoms, Lorentz Institute, Leiden, the Netherlands, 28 September 2007. 88 Annual report 2007

– Galistu, G.M., Visser, A. de, Pruisken, A.M.M., Corrections to scaling of the plateau-insulator transition in the quantum Hall regime, FOM Meeting Physics@Veldhoven, the Netherlands, 23-24 January 2007 (poster). – van Leeuwen, W.A., The Boltzmann equation in general relativity, Conference Journ´eesPhysique Statistique et G´eometrie, Nice, France, 15 January 2007. – Nienhuis, B., Universal aspects of forces in static sand piles, Colloquium AMOLF, Amsterdam, the Netherlands, 19 January 2007. – Nienhuis, B., Statistical lattice models on a cylinder: an exercise in experimental mathematics, Seminar Geometry and Quantum Theory, University of Amsterdam, the Netherlands,, 23 March 2007. – Nienhuis, B., Scale invariance in static granular matter, Seminar Technical Uni- versity Eindhoven, the Netherlands, 26 March 2007. – Nienhuis, B., Universality and scaling in static granular matter, Conference Ran- dom Shapes, Representation Theory, and Conformal Field Theory, University of California, Los Angeles, USA, 28 March 2007. – Nienhuis, B., Forces in sand piles: universality and scaling, Seminar Universit´e Henri Poincar´e,Nancy, France, 6 September 2007. – Nienhuis, B., Entanglement in a spin chain, National Seminar Condensed Matter, Utrecht University, the Netherlands, 7 December 2007. – Nienhuis, B., Correlations in percolation models on arbitrary rhombus tilings, Sem- inar Oxford University, UK, 14 December 2007. – Nieuwenhuizen, T.M., Einstein versus Maxwell: is gravitation a curvature of space, or a field in flat space, or both?, Physics of Quantum Electronics 37, Snowbird, Utah, USA, 6 January 2007. – Nieuwenhuizen, T.M., Einstein versus Maxwell: is gravitation a curvature of space a field in flat space, or both?, Dynamics and Thermodynamics of Black Holes and Naked Singularities II, Politechnico, Milano, Italy, 11 May 2007. – Nieuwenhuizen, T.M., Einstein versus Maxwell: is gravitation a curvature of space a field in flat space, or both?, Moscow, Physical Interpretations of Relativity The- ory, Bauman University, Moscow, Russia, 3 July 2007. – Nieuwenhuizen, T.M., Bose-Einstein condensation, macroscopic quantum black holes and all that, Colloquium Condensed Matter Group, University of Amster- dam, the Netherlands, 23 November 2007. – Pruisken, A.M.M., Coulomb blockade and super universality of the theta-angle, Colloquium Weizmann Institute, Rehovot, Israel, 4 June 2007. – Pruisken, A.M.M., Quantum Hall physics and superuniversality of the vartheta angle, Colloquium Brown University, Providence Rhode Island, USA, 11 October 2007. – Pruisken, A.M.M., The effects of the Coulomb interaction on multi fractality, Inter- national Conference Frontiers in Quantum Science, Novel Phenomena in Graphene, Chennai, India, 11-12 December 2007. – Schoutens, K., Rotating bosons - from spin textures to quantum Hall states, Seminar University of Napels, Italy, 15 February 2007. – Schoutens, K., Entanglement entropy in quantum Hall states, International Con- ference Topological Quantum Computing, IPAM, UCLA, Los Angeles, USA, 26 February-2 March 2007. 6. Scientific activities 89

– Schoutens, K., Topological quantum computation, Seminar University of Groningen, the Netherlands, 19 March 2007. – Schoutens, K., Supersymmetric lattice models - exact results for lattice fermions in dimension D¿1, Seminar DAMTP, Cambridge, UK, 2 May 2007. – Schoutens, K., Superfrustration of charge degrees of freedom, XXIII IUPAP Inter- national Conference on Statistical Physics (Statphys23), Genova, Italy, 9-14 July 2007. – Schoutens, K., Phases of rotating bosons, series of 4 lectures, INSTANS Summer School, Oxford, UK, 26 August-2 September 2007. – Schoutens, K., Bipartite entanglement entropy in quantum Hall states, Interna- tional Workshop on Topological Quantum Computing, Hamilton Mathematics In- stitute TCD, Dublin, Ireland, 10-14 September 2007. – Schoutens, K., Topological quantum computation, Nano Science Seminar Delft Uni- versity, the Netherlands, 14 November 2007.

Vrije Universiteit Amsterdam – Green, K., Mode structure of a vertical-cavity surface-emitting laser subject to op- tical feedback, FOM meeting Physics@Veldhoven, the Netherlands, 23-24 January 2007. – Green, K., Effects of optical feedback induced mode-coupling in VCSELs and Trans- itions from locking in delay coupled semiconductor lasers, PHASE, Sup´elec,Cam- pus de Metz, France, 28-30 March 2007 (2 talks). – Green, K. and Marten, F., Transverse-multi-mode vertical-cavity surface-emitting lasers subject to optical feedback, Dynamics of Patterns Symposium, Twente, the Netherlands, 26-27 April 2007 (poster). – Green, K., Transverse mode interaction in semiconductor lasers subject to optical feedback, 9th SIAM Conference on Applications of Dynamical Systems, Snowbird Ski and Summer Resort, Snowbird, Utah, USA, (mnisymposium organiser Nonlin- ear Dynamics and Bifurcations in Lasers and Optical Cavity Structures), 28 May to 1 June 2007. – Green, K., Minicourse: Advanced Algorithms and Software for the Bifurcation Analysis of Dynamical Systems, Centre de recherches mathmatiques, Universit de Montral, Montreal, Canada, 30 June to 1 July 2007. – Green, K., Bifurcation analysis of a spatially-extended semiconductor laser subject to optical feedback, Advanced Algorithms and Numerical Software for the Bifurca- tion Analysis of Dynamical Systems, CRM Montreal, Canada, 2-6 July 2007. – Green, K., Bifurcation analysis of a multi mode, spatially extended semiconductor laser subject to optical feedback, Nonlinear Dynamics in Semiconductor Lasers, Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Mohrenstr. 39, Berlin, Germany, 19-21 November 2007. – MacKintosh, F.C., Polymer physics and cell biology, Shell-FOM Workshop Chal- lenges for Theoretical Physicists at Shell, Rijswijk, the Netherlands, 10 January 2007. – MacKintosh, F.C., Active gels and microtubule dynamics in cells, Seminar, TU Munich, Germany, 25 January 2007. – MacKintosh, F.C., Active, non-equilibrium gels: polymer physics and cell mechan- 90 Annual report 2007

ics, Ehrenfest Colloquium, Leiden, the Netherlands, 21 February 2007. – MacKintosh, F.C., Non-equilibrium mechanics and fluctuations of active gels and living cells, Seminar, Institute Curie, Paris, 25 April 2007. – MacKintosh, F.C., Non-equilibrium mechanics and fluctuations of active gels and living cells, Colloquium, AMOLF, Amsterdam, the Netherlands, 7 May 2007. – MacKintosh, F.C., Non-equilibrium mechanics and fluctuations of active gels and living cells, Colloquium, Stanford, California, USA, 22 May 2007. – MacKintosh, F.C., What soft matter physics can learn from cells: cytoskeletal networks and active gels, Colloquium, Aspen Center for Physics, Colorado, USA, 31 May 2007. – MacKintosh, F.C., Non-equilibrium mechanics and fluctuations in the cytoskeleton, MCTP/ICAM Biophysics Workshop on Mechanics of Life: From Biomolecules to Molecular Machines, University of Michigan, USA, 13 June 2007. – MacKintosh, F.C., Non-equilibrium mechanics and fluctuations in the cytoskeleton, Seminar, New York University, USA, 19 June 2007. – MacKintosh, F.C., Non-equilibrium mechanics and fluctuations in the cytoskeleton, From Biophysics to Medicine: KAIST Cavendish Workshop 2007, Cambridge Uni- versity, UK, 29 June 2007. – MacKintosh, F.C., Non-equilibrium fluctuations in active gels and living cells, Laser Center Meeting, Vrije Universiteit Amsterdam, the Netherlands, 17 December 2007. – Visser, T.D., Workshop Challenges and Opportunities in Nano-Optics, Fudan Uni- versity, Shanghai, China, 8 January 2007. – Visser, T.D., Ninth Conference on Coherence and Quantum Optics, Rochester, New York, USA, 11 June 2007. – Visser, T.D., Annual Meeting of the Optical Society of America, San Jose, Cali- fornia, USA, 16 September 2007. – Visser, T.D., Univerity of North Carolina, Charlotte, North Carolina, USA, 7 December 2007.

University of Groningen – van Enter, A.C.D., First-order transitions in the presence of continuous symmet- ries, Conference Percolazione, Campi Aleatori, Evoluzione di Sisteme Stocastici Interagenti, Bologna, Italy, June 2007. – van Enter, A.C.D., Gibbsian and non-Gibbsian measures, Conference Percolazione, Campi Aleatori, Evoluzione di Sisteme Stocastici Interagenti, Bologna, Italy, June 2007. – van Enter, A.C.D., First-order transitions in the presence of continuous symmet- ries, Warwick University, Coventry, UK, November 2007. – van Enter, A.C.D., On the road to the ergodic limit whole heating a system of plane rotators. Gibbsianness and non-Gibbsianness as the presence or absence of effective Hamiltonians, Centre de Recherches Math´ematiquesMontreal, Canada, 2007. 6. Scientific activities 91

Leiden University – Bazaily, Y.B., Dissipative dynamics in planar magnetic structures, Conference Spins in Nanostructures, Aspen Center for Physics, Aspen, USA, 14-20 January 2007. – Beekman, A.J. and Zaanen, J., Quantum liquid crystals as Hopf-symmetry condens- ates, Conference, Physics@Veldhoven, Stichting voor Fundamenteel Onderzoek der Materie (FOM), Veldhoven, the Netherlands, 22-24 January 2007 (poster). – Beekman, A.J. and Zaanen, J., Twenty years of high Tc superconductivity, Physics Colloquium, Radboud University Nijmegen, the Netherlands, February 2007. – Beekman, A.J. and Zaanen, J., Twenty years of high Tc superconductivity, Physics Colloquium, TU Twente, Enschede, the Netherlands, February 2007. – Beekman, A.J. and Zaanen, J., Twenty years of high Tc superconductivity, Af- scheidssymposium, Prof. Feiner, Utrecht University, the Netherlands, March 2007. – Beekman, A.J. and Zaanen, J., Twenty years of high Tc superconductivity, Physics Colloquium, University of Groningen, the Netherlands, March 2007. – Beekman, A.J. and Zaanen, J., Quantum liquid crystals as Hopf-symmetry condens- ates, DRSTP Postgraduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007 (poster). – Beekman, A.J. and Zaanen, J., Twenty years of high Tc superconductivity, Physics Colloquium, KTH, Stockholm, Sweden, May 2007. – Beekman, A.J. and Zaanen, J., Quantum liquid crystals as Hopf-symmetry con- densates, Conference, Casimir Science Day, Casimir Research School, Eindhoven, the Netherlands, 7-9 May 2007 (poster). – Beekman, A.J. and Zaanen, J., Quantum liquid crystals as Hopf-symmetry con- densates, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007 (poster). – Beekman, A.J. and Zaanen, J., Quantum liquid crystals as Hopf-symmetry con- densates, School, 50th Anniversary of BCS: From BCS to Exotic Superconductiv- ity, International Institute for Complex Adaptive Matter, Carg´ese,France, 16-28 July 2007 (poster). – Beenakker, C.W.J., Valleytronics in graphene, Workshop Electronic Properties of Graphene, Kavli Institute for Theoretical Physics, Santa Barbara, USA, 8-19 Janu- ary 2007. – Beenakker, C.W.J., Andreev reflection in graphene, Lorentz Center Workshop on Graphene, Leiden, the Netherlands, 5-7 February 2007. – Beenakker, C.W.J., Andreev reflection in graphene, March Meeting of the American Physical Society, Denver, USA, 5-9 March 2007. – Beenakker, C.W.J., Mesoscopic physics in graphene, Universiteit Groningen, Groningen, the Netherlands, 12 April 2007. – Beenakker, C.W.J., Mesoscopic physics in graphene, Technische Universiteit Eind- hoven, Eindhoven, the Netherlands, 19 April 2007. – Beenakker, C.W.J., What is special about graphene?, Casimir Science Days, Eind- hoven, the Netherlands, 7-9 May 2007. – Beenakker, C.W.J., Valleytronics in graphene, A.I. Larkin Memorial Conference, Chernogolovka, Russia, 24-28 June 2007. – Beenakker, C.W.J., Demonstration of one-parameter scaling at the Dirac point 92 Annual report 2007

of graphene, Amsterdam Summer Workshop Low-D Quantum Condensed Matter, Amsterdam, the Netherlands, 2-7 July 2007. – Beenakker, C.W.J., What is special about graphene?, Niels Bohr Institute, Copen- hagen, Denmark, 23 August 2007. – Beenakker, C.W.J., Valleytronics in graphene, Radboud Universiteit, Nijmegen, the Netherlands, 17 September 2007. – Beenakker, C.W.J., Solid-state quantum computing, Arnold Sommerfeld Summer School, Munich, Germany, 1-12 October 2007. – Beenakker, C.W.J., Andreev reflection and Klein tunneling in graphene, Chalmers University of Technology, G¨oteborg, Sweden, 15 November 2007. – Denteneer, P.J.H., Phenomenology of the two-dimensional disordered fermionic Hubbard model, Lorentz Center Workshop on Disorder in Condensed Matter and Cold Atoms, Leiden, the Netherlands, 24-28 September 2007. – Nienhuis, G., Cavity modes with general astigmatism, SPIE Photonics West, San Jose, California, USA, 20-25 January 2007. – Recher, P., Aharonov-Bohm effect and broken valley-degeneracy in a graphene ring, University of Basel, Switzerland, 10 July 2007. – Recher, P., Aharonov-Bohm effect and broken valley-degeneracy in a graphene ring, RTN NANO Meeting on Fundamentals of Nanoelectronics, Portoroz, Slovenia, 2-7 September 2007. – Schiessel, H., The geometry of DNA compaction: stacking basepairs and nucle- osomes, 6th European Biophysics Congress, London, England, UK, July 2007. – Schiessel, H., The geometry of DNA compaction: stacking basepairs and nucle- osomes, Physics of Biological Matter Safed Summer Workshop, Safed, Israel, September 2007. – Storm, C., International Workshop on The Interplay between Mechanics and Bio- logy on Multiple Length Scales, Castro-Urdiales, Spain, 2007. – Tighe, B.P., Nonlinear elastic stress response in granular materials, APS March Meeting, Denver, USA, 6 March 2007. – Tighe, B.P., Fluctuations in a granular medium unjammed by flow, Aspen Center for Physics Jamming Workshop, Aspen, USA, 31 July 2007. – van den Brink, J., Spontaneous decoherence in superconducting qubits, Korrelation- stage 2007, Dresden, Germany, February 2007. – van den Brink, J., Ultrashort lifetime expansion for indirect resonant inelastic x- ray scattering, CMSN 2007, Argonne National Laboratories, Chicago, USA, May 2007. – van den Brink, J., New concepts, charge/orbital order in multiferroics, European School on Multiferroics, Grenoble, France, July 2007. – van den Brink, J., Frustration in orbital models, Workshop on Highly Frustrated Magnets, ICTP, Trieste, Italy, August 2007. – van den Brink, J., Multiferroicity induced by dislocated spin-density waves, Mot- terials Conference, Kavli Institute for Theoretical Physics, Santa Barbara, USA, September 2007. – van den Brink, J., Motterials Workshop, Blackboard seminar on Motterials, Kavli Institute for Theoretical Physics, Santa Barbara, USA, September 2007. – van den Brink, J., Charge fractionalization at the metal-insulator transition, Con- 6. Scientific activities 93

ference on Quantum Materials, Leibniz Institute Dresden, Germany, December 2007. – van Saarloos, W., A theoretical physicist’s look at polymer flow instabilities, Shell- FOM Workshop, Rijsbergen, the Netherlands, 10 January 2007. – van Saarloos, W., The surprises of polymer flow instabilities, Seminar ESPCI Paris, France, 19 February 2007. – van Saarloos, W., Soft hard matter: the jamming transition in granular media, Theory Seminar, Utrecht, the Netherlands, 21 November 2007. – Zaanen, J., Observing fluctuating stripes in high Tc superconductors, New3SC In- ternational Conference, Sydney, Australia, January 2007. – Zaanen, J., Fermionic quantum criticality, Theoretical Physics Colloquium, Uni- versity of Amsterdam, the Netherlands, March 2007. – Zaanen, J., Fermionic quantum critically, Physics Seminar, KTH, Stockholm, Sweden, May 2007. – Zaanen, J., Fermionic quantum criticality, Seminar, Nanocenter, Los Alamos, USA, July 2007. – Zaanen, J., Fermionic quantum criticality, Physics Seminar, Stanford University, USA, July 2007. – Zaanen, J., New concepts, charge/orbital order in multiferroics, European School on Multiferroics, Grenoble, France, July 2007. – Zaanen, J., Fermionic quantum criticality, CASTU Seminar, Tsinghua University, Beijing, China, August 2007. – Zaanen, J., Frustration in orbital models, Workshop on Highly Frustrated Magnets, ICTP, Trieste, Italy, August 2007. – Zaanen, J. and Kr¨uger,F., Fermionic quantum criticality, XVII Symposium on Condensed Matter, Vrsac, Serbia, September 2007. – Zaanen, J. and Kru¨uger,F., Fermionic quantum criticality, Magnetic and Super- conducting Materials Conference 07, Khiva, Uzbekistan, September 2007. – Zaanen, J., The high Tc enigma: it is the normal state, stupid!, Keynote Lecture, International Symposium on Lattice Effects in Cuprate High Tc Superconductors, Tsukuba, Japan, November 2007. – Zaanen, J., Fermionic quantum criticality, Forum of Physics, 2007: Frontiers in Condensed Matter Physics, Hong Kong, China, December 2007.

Radboud University Nijmegen – Boukhvalov, D.W., Dobrovitski, V.V., Al-Saqer, M., Katsnelson, M.I., Lichten- stein, A.I., Koegerler, P. and Harmon, B.N., Influence of ligands to exchange in- teractions in Mn12, IMM Symposium, Nijmegen, the Netherlands, 7-8 May 2007. – Fasolino, A., Graphene between hard and soft matter, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 31 May-1 June 2007. – Fasolino, A., Ripples in graphene: Monte Carlo simulations compared to the theory of tethered membranes, International Conference on Statistical Physics, Genova, Italy, July 2007. – Fasolino, A., Ripples in graphene, NanoteC07, Brighton, UK, August 2007. – Fasolino, A., La scoperta del grafene, Festival della Scienza, Genova, Italy, 25 October-6 November 2007. 94 Annual report 2007

– Fasolino, A., Stability and elastic properties of organized molecular systems, In- ternational Conference on Magnetoscience: Magnetic Field Effects in Chemistry, Physics, Biology and Related Phenomena, Hiroshima, Japan, 11-15 November 2007. – Fasolino, A., Computer simulations of plymorphic carbon, as good as it gets, Physics Colloquium, FOM-Institute for Plasma Physics Rijnhuizen, Nieuwegein, the Netherlands, 6 December 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, FOM-Meeting Physics@Veldhoven 2007, Veldhoven, the Netherlands, 23-24 January 2007. – Katsnelson, M.I., Defects in graphene: electronic structure, magnetism, scattering mechanisms, Workshop Graphene, Leiden, the Netherlands, February 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Conference Relativistic Effects in Physics and Chemistry of Heavy Elements REHE2007, Ottrott, France, March 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Annual Meeting, German Physical Society Regensburg, Germany, March 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Seminar, MIT, Massachusetts, USA, April 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Seminar, Arizona State University, USA, April 2007. – Katsnelson, M.I., Defects in graphene: electronic structure, magnetism, scattering mechanisms, Seminar, University of Hamburg, Germany, April 2007. – Katsnelson, M.I., Defects in graphene: electronic structure, magnetism, scattering mechanisms, Seminar, Harvard University, USA, May 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Seminar, University of Boston, USA, May 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Seminar Institute of Materials Science, Madrid, Spain, June 2007. – Katsnelson, M.I., Introduction to many-body perturbation theory for interacting fermions, Lectures in Summer School Ab Initio Many-Body Theory, San Sebastian, Spain, July 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Workshop Low-D Quantum Condensed Matter, Amsterdam, the Nether- lands, July 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Dynamical Properties of Solids (DYPROSO-XXXI), Porto, Portugal, September 2007. – Katsnelson, M.I., Magnetism of sp-electrons in narrow impurity bands, Workshop on Graphite, Graphene and their Technical Applications and FERROCARBON Meeting, Madrid, Spain, September 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Colloquium, Department of Chemistry and Biochemistry, University of Mu- nich, Germany, October 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and 6. Scientific activities 95

QED, Paul Scherrer Seminar, Z¨urich, Germany, October 2007. – Katsnelson, M.I., Graphene: new bridge between condensed matter physics and QED, Seminar University of Leuven, Belgium, 2007.

Utrecht University – Barkema, G., Simulation of polymer translocation, Leiden, the Netherlands, 2 Feb- ruary 2007. – Barkema, G., Computer simulation of structural glasses, Conference on Structure and Dynamics in Soft Matter and Biomolecules: From Single Molecules to En- sembles, 4-8 June, ICTP, Trieste, Italy, 5 June 2007. – Barkema, G., Simulation of polymer translocation, Kac Seminar, Utrecht, the Neth- erlands, 5 October 2007. – Bier, M., Colloid based crystalline and amorphous structures, Conference From Physical Understanding to Novel Architectures of Fuel Cells, 21-25 May 2007, Trieste, Italy, 24 May 2007. – Bier, M., Studies of platelike colloidal particles, Seminar ’zur Physik der konden- sierten Materie’, MPI fuer Metallforschung, Stuttgart, Germany, 27 November 2007. – Bier, M., Relaxation dynamics of fluids of colloidal platelets, Second Dutch Soft Matter Meeting, Leiden, the Netherlands, 5 April 2007. – Bier, M., Steady states in fluids of platelike colloidal particles, Third Dutch Soft Matter Meeting, Utrecht, the Netherlands, 18 October 2007. – Duine, R., Theory of current-driven domain wall motion, Physics@Veldhoven 2007, Annual Physics Meeting of FOM, 22-24 January 2007, Veldhoven, the Netherlands, 23 January 2007. – Duine, R., Thermally-assisted current-driven domain wall motion, APS March Meeting, Denver, Colorado, USA, 6 March 2007. – Duine, R., Spin transfer: from spin valves to current-driven domain walls, Physics of Nanostructures Group, Eindhoven University of Technology, Eindhoven, the Netherlands, 3 April 2007. – Duine, R., Spin transfer: from spin valves to current-driven domain walls, Theory Colloquium, University of Groningen, the Netherlands, 16 April 2007. – Duine, R., Current-driven domain-wall motion and spin pumping, SpinNor 2007: Spin and Charge Flow in Nanostructures Conference, Centre for Advanced Study, Oslo, Norway, 27 June 2007. – Duine, R., Spin transfer and spin pumping, University of Freiburg, Freiburg, Ger- many, 5 July 2007. – Duine, R., Spin transfer and spin pumping, Ornstein Colloquium, Utrecht, the Netherlands, 8 November 2007. – Duine, R., Spin pumping by domain walls, National Seminar Condensed Matter Physics, Utrecht, the Netherlands, 7 December 2007. – Duine, R., The 2007 Nobel prize in physics, General Physics Colloquium (together with P. Zeijlmans van Emmichoven), Utrecht, the Netherlands, 14 December 2007. – Ernst, M., Nonlinear kinetic theory of complex systems, Onsager Lecture, General Physics Colloquium, Norwegian University of Science and Technology (NTNU), Trondheim, Norway, 27 April 2007. 96 Annual report 2007

– Ernst, M., Kinetic theories of complex systems, Norwegian University of Science and Technology (NTNU), Trondheim, Norway, September-October 2007. – Massignan, P., Efimov physics close to a Feshbach resonance, BEC Group Seminar, Copenhagen, Denmark, 8 February 2007. – Massignan, P., Efimov states in strongly-interacting thermal gases, NVV AMO Meeting, Lunteren, the Netherlands, 4 April 2007. – Massignan, P., Efimov states close to a Feshbach resonance, The Trimester on Quantum Gases, Paris, France, 29 May 2007. – Massignan, P., Efimov states near a Feshbach resonance, Group Seminar, Inns- bruck, Austria, 6 November 2007. – Massignan, P., Twin peaks in rf spectra of Fermi gases at unitarity in the normal phase, Amsterdam Quantum Collective, Amsterdam, the Netherlands, 10 October 2007. – Morais Smith, C., Zooming in on the quantum Hall effect, Workshop on Quantum Hall Effect, 12-16 February 2007, International Center for Theoretical Physics, Brasilia, Brazil, 12 February 2007. – Morais Smith, C., BEC of excitons in bilayer quantum Hall systems: a bosonization approach, Workshop on Quantum Hall Effect, 12-16 February 2007, International Center for Theoretical Physics, Brasilia, Brazil, 13 February 2007. – Morais Smith, C., Novel phases in low-dimensional systems, Vienna Symposium on the Foundations of Modern Physics, 7-10 June 2007, Vienna, Austria, 7 June 2007. – Morais Smith, C., Lightly doped LaSrCuO as a Lifshitz helimagnet, International Symposium on Lattice Effects in Cuprate High-Temperature Superconductors - Spin, Phonon, or Third Way?, 31 October-2 November 2007, Tsukuba, Japan, 31 October 2007. – Morais Smith, C., Novel quantum phases in low-dimensional systems, ETH, Zurich, Switzerland, 15 November 2007. – Stoof, H.T.C., Imbalanced Fermi gases, Workshop on Quark Gluon Plasmas and Cold Atoms, 19-23 March, ECT* Trento, Italy, 22 March 2007. – Stoof, H.T.C., Ultracold Fermi gases, Colloquium, University of Antwerpen, Antwerpen, Belgium, 15 May 2007. – Stoof, H.T.C., Imbalanced Fermi gases: The Rice story, Workshop on Disorder in Condensed Matter and Cold Atoms, 24-28 September, Lorentz Center, Leiden, the Netherlands, 25 September 2007. – Stoof, H.T.C., Ultracold trapped Fermi gases, International Symposium on Ultra- Cold Quantum Gases and Atomtronics, 5-7 November 2007, Oren¨asCastle,¨ Sweden, 6 November 2007. – Stoof, H.T.C., Achieving the Ne’el state in an optical lattice, Quantum Dynamics out of Equilibrium, 12 November-14 December 2007, IHP Paris, France, 7 Decem- ber 2007. – van Beijeren, H., Green-Kubo formalism for solids, Heraeus-Seminar, Thermal Transport and Relaxation: Foundations and Perspectives, Bad Honnef, Germany, 9 January 2007. – van Beijeren, H., Finite size effects on equilibrium shapes due to line tensions, Symposium on Surface Science 2007, Les Arcs, France, 16 March 2007. 6. Scientific activities 97

– van Beijeren, H., Chaos and the physics of non-equilibrium systems, Bhaba Atomic Research Center, Mumbai, India, 10 and 11 April 2007. – van Beijeren, H., Chaos and the physics of non-equilibrium systems, Tata Institute of Fundamental Research, Mumbai, India, 18 April 2007. – van Beijeren, H., Green-Kubo formalism for solids, Tata Institute of Fundamental Research, Mumbai, India, 19 April 2007. – van Beijeren, H., Chaos and the physics of non-equilibrium systems, Indian Insti- tute of Technology, Roorkee, India, 23 April 2007. – van Beijeren, H., Equilibrium shapes of small crystals, Indian Institute of Techno- logy, Roorkee, India, 24 April 2007. – van Beijeren, H., Chaos and the physics of non-equilibrium systems, Jawaharlal Nehru University, New Delhi, India, 25 April 2007. – van Beijeren, H., Green-Kubo formalism for solids, Jawaharlal Nehru University, New Delhi, India, 27 April 2007. – van Beijeren, H., Chaos and the physics of non-equilibrium systems, Melbourne University, Melbourne, Australia, 7 June 2007. – van Beijeren, H., Chaos and the physics of non-equilibrium systems, Griffith Uni- versity, Brisbane, Australia, 12 June 2007. – van Beijeren, H., Chaos and the physics of non-equilibrium systems, Gordon God- frey Colloquium University of New South Wales, Sydney, Australia, 12 June 2007. – van Beijeren, H., Green-Kubo formalism for solids, Singapore National University, 29 June 2007. – van Beijeren, H., Dynamics of solids and the Green-Kubo formalism, CCP2007, ULB Brussels, Belgium, 5 September 2007. – van Beijeren, H., Green-Kubo for solids, Institut Henri Poincar´e,Paris, France, 19 and 25 October 2007. – van Beijeren, H., Green-Kubo for solids, 98th Statistical Mechanics Conference, Rutgers University, New Brunswick, USA, 17 December 2007. – van Beijeren, H., Green-Kubo for solids, IPST, University of Maryland at College Park, USA, 19 December 2007. – van Roij, R., From liquids and electrolytes to colloidal suspensions, DRSTP Post- graduate Course Statistical Physics and Theory of Condensed Matter, Driebergen, the Netherlands, 23-27 April 2007. – van Roij, R., Colloidal suspensions: in bulk, in gravity, and near oil-water inter- faces, DRSTP Symposium Trends in Theory 2007, 31 May-1 June 2007, Dalfsen, the Netherlands, 1 June 2007. – van Roij, R., Destructed double-layer and ionic charge separation near the oil-water interface, International Soft Matter Conference, Aachen, Germany, 4 October 2007. – van Roij, R., Ions and colloids near the oil-water interface: can oil and water mix?, Institute for Theoretical Physics, Utrecht, the Netherlands, 12 November 2007. 98 Annual report 2007 7 Science-related activities

This chapter presents an overview of the science-related activities of DRSTP staff members and postdoctoral fellows. Besides publications in professional journals (sect. 7.1) and publications about or related to physics in daily newspapers (sect. 7.2) also public lectures (sect. 7.3) are given. All other outreach activities like forum discus- sions, television interviews, personal columns in newspapers etc. are listed in the paragraph ‘other contributions’ (sect. 7.4). Science-related activities of PhD students can be found in chapter 3 (sects. 3.6 and 3.7).

7.1 Professional publications

– de Jong, S. and Kleiss, R., Het uur der zwaarheid (I), Nederlands Tijdschrift voor Natuurkunde, 73-2 (2007) 42. – de Jong, S. and Kleiss, R., Het uur der zwaarheid (II), Nederlands Tijdschrift voor Natuurkunde, 73-3 (2007) 78. – Ellenbroek, L. and van den Horn, L.J., In het kielzog van Kelvin, Nederlands Tijd- schrift voor Natuurkunde, 73 (2007) 310-313. – Oriti D., Gravita’ quantistica (Quantum gravity) and Teorie fisiche unificate (Uni- fied physical theories) entries for the enciclopaedia: “Enciclopedia del novecento: scienza e tecnologia”, Casa Editrice Motta, 2007. – Peeters, K., Symbolic field theory with Cadabra, Computer Algebra Rundbrief 40, Fachgruppe Computeralgebra der GI, DMV und GAMM.

7.2 Other publications

– Bais, F.A., As Equa¸co¨es, Portuguese edition, published by Gradiva, Lisbon, Por- tugal, 2007, book. – Bais, F.A., Les Equations, French edition, published by DG-Livres, Paris, France, 2007, book. – Bais, F.A., De sublieme eenvoud van relativiteit: een visuele inleiding, published by Amsterdam University Press, 2007, book. – Bais, F.A. Very special relativity: an illustrated guide, published by Harvard Uni- versity Press, Cambridge, MA, USA, 2007, book. – Bais, F.A., Dijkgraaf, R.H., Fresco, L., Haring, B., Kroonenberg, S., Lintsen, H., van Lunteren, F. and Plasterk, R., Vensters op de stille kracht, B`etacanon, in: De Volkskrant, rubriek Kennis, 5 January 2007, article. – Dijkgraaf, R.H., De eeuwige deadline, January 1, Het liedje in je hoofd, 3 February, Ultiem jongensboek, 22 February, De IJzeren Sluier, 3 March, Belle en het beest, 31 100 Annual report 2007

March, Mag het een onsje minder?, April 28, Disciplines op drift, 26 May, Marx- istische principes, 23 June, Academisch kwartiertje, September 1, Beeldcultuur, 1 October, Integreren en differenti¨eren, 27 October, Frans, Turks of Chinees, Novem- ber 24, Fysicus in oorlogstijd, December 21, in: NRC Handelsblad, Wetenschap en Onderwijs, columns. – Dijkgraaf, R.H., De eerste dag, Folia 2, Sponsor, Folia 4, Oorlog!, Folia 6, Lego- wereld, Folia 8, You Lose, Folia 10, Harry Potter, Folia 12, Plakjes tijd, Folia 14, Er gewoon zijn, Folia 19, Hooggeleerde kleuters, Folia 19, Impact-factor, Folia 25, Aandacht, Folia 28, Op cursus, Folia 31, Help! Vakantie, Folia 34, columns. – Dijkgraaf, R.H., Palindroom, verschenen in: Met de tank door de voordeur, bloem- lezing, Propria Cures, Nieuw Amsterdam, 2007, article. – Dijkgraaf, R.H., Hypochonder, LRPN (Magazine over Onderwijs en Leerplanont- wikkeling), Wetenschap, January 2007, column. – Dijkgraaf, R.H., Sturen van technologie zonder remmen, Het Financi¨eleDagblad, 16 February 2007, article. – Dijkgraaf, R.H., Harry Mulisch: De ontdekking van de hemel, NRC, rubriek Next, 1 March 2007, book review. – Dijkgraaf, R.H., De dood is de bron van alle levenslust, NRC Handelsblad, Opinie & Debat, 21 December 2007, article. – Dijkgraaf, R.H., Fresco, L., Wat iedereen zou moeten weten, in: De Volkskrant, rubriek Kennis, 29 December 2007, article. – van der Schaar, J.P., Schalm, K.E., Verlinde, E.P, De echo van de oerknal, KIJK, edition June 2007, article. – van der Schaar, J.P., Ons absurde heelal, Academische Boekengids, edition Septem- ber 2007, article. – Skenderis, K., review of String theory in a nutshell by E. Kiritsis, Classical and Quantum Gravity 24 (2007) 5725, book review.

7.3 Public lectures

– Barkema, G.,Theoretische fysica en de kennissamenleving, Oratie te Leiden, 19 January 2007. – Beenakker, C.W.J., Quantum computers, Studentenvereniging Prometheus, Leiden, the Netherlands, 31 January 2007. – Beenakker, C.W.J., Nanokippengaas, Symposium Nanotechnologie & Nanoscience, Natuurwetenschappelijke Studievereniging Amsterdam, the Netherlands, 30 Octo- ber 2007. – Bergshoeff, E., Cool Science Talk Albert Einstein, Rotterdam, the Netherlands, 2007. – Bergshoeff, E., Lecture on the occasion of the Nicolaas Muleriusstipendium, Groningen, the Netherlands, 13 June 2007. – de Wit, B., Black hole partition functions and duality, De Leidsche Flesch, Leiden University, the Netherlands, 22 February 2007. – Dijkgraaf, R.H., Can the universe be captured in an equation?, Aspen Public Lec- ture, Aspen, USA, 16 July 2007. 7. Science-related activities 101

– Loll, R., Quantum structure of spacetime: a sneak preview, Natuurkundig Gezelschap, Utrecht, the Netherlands, 6 February 2007. – Mulders, P.J., Het ongrijpbare neutrino, Lecture for the Natuurkundig Genootschap, Rotterdam, the Netherlands, 19 March 2007. – Stoof, H.T.C., Ultrakoude atoomfysica, NEMO, Bessensap, 22 May 2007. – ’t Hooft, G., Theory behind gravitational waves, Symposium ‘Space for Society’, VSV ‘Leonardo da Vinci’, Delft, 16 March 2007. – ’t Hooft, G., Some remarks on an old problem: Chiral symmetry on the lattice, Symposium ‘The Many Faces of Quantum Fields’, in honor of P. van Baal, 11 April 2007.

7.4 Other contributions

– Bais, F.A., Zijn zonder zintuigen, about Werner Herzog’s Land des Schweigens und der Dunkelheit, Serie Film en Wetenschap, UA, 12 March 2007, talk. – Bais, F.A., Physicae synopsis, Nationale Comenius leergang, Kasteel Warnsborn, Arnhem, 16 March 2007, talk. – Bais, F.A., Waarom de b`etacanon, FNWI dies viering, Tropenmuseum, Amster- dam, 29 March 2007, talk. – Bais, F.A., Turningpoints in science, European Comenius Course, St. John’s Col- lege, Cambridge, UK, 18 and 20 April 2007, invited lectures. – Bais, F.A., Nieuwe natuurkunde zal gedijen met gedreven docenten, afscheidssym- posium Prof. Ch.G. van Weert, UA, 25 April 2007, talk. – Bais, F.A., B`etain de bieb, Nederlandse vereniging van openbare bibliotheken, Teylers Museum, Haarlem, 24 May 2007, talk. – Bais, F.A., The quest for Quantum Gravity, Debate with Lee Smolin and Eric Verlinde, DRSTP Symposium Trends in Theory 2007, Dalfsen, the Netherlands, 30 May 2007, debate. – Bais, F.A., Verticaal blijven denken, Interviewer Martijn van Calmthout, in: De Volkskrant, 23 June 2007, interview. – Bais, F.A., De sublieme eenvoud, programma Noorderlicht, radio 4, 25 June 2007, interview. – Bais, F.A., Meinstein, boekpresentatie “Sublieme eenvoud...”, Spui 25, Amster- dam, 27 June 2007, talk. – Bais, F.A., Sublieme eenvoud, in radioprogramme ”Hoe? Zo!”, Teleac, 6 July 2007. – Bais, F.A., De sublieme eenvoud van relativiteit..., Atheneum Boekhandel, Haar- lem, 25 August 2007, talk. – Bais, F.A., Keerpunten, Eerste les Natuur, Leven en Technologie, Damstede college, Amsterdam, 25 September 2007, lecture. – Bais, F.A., Physicae synopsis, Comenius leergang, Amersfoort, 27 September 2007, lecture. – Bais, F.A., Turningpoints in science, European Comenius Course, St. John’s Col- lege, Cambridge, UK, 29-31 September 2007, Invited lectures. – Bais, F.A., De hoogleraar als bestuurder, Rectoraatsoverdracht UA, 1 October 2007, talk. 102 Annual report 2007

– Bais, F.A., De sublieme eenvoud..., Nederlandse Defensie Akademie, Den Helder, 14 November 14, 2007, talk. – Bais, F.A., De b`etacanon, Winterlezing Zaandams Lyceum, Zaandam, 10 December 10, 2007, talk. – Bais, F.A., De sublieme eenvoud..., Woudschoten conferentie van het NVON, Noord- wijkerhout, 15 December 15, 2007, talk. – Barkema, G., TWIN Wiskunde-Natuurkunde, Universiteit Utrecht, contributed presentation, symposium “Studiesucces in de bachelorfase”, Amsterdam, 12 June 2007. – Bergshoeff, E., Interview, Hoe?Zo! Radio, the Netherlands, 5 July 2007. – de Boer, J., Snaartheorie, Wolters-Noordhoff sciencedag, Ede, 14 March 14, 2007, talk. – de Boer, J., Snaartheorie, Bijeenkomst 1e jaars studenten, highlights, Amsterdam, 20 April 20, 2007, talk. – de Boer, J., Olympiades, SLO forum, Enschede, 24 May 24, 2007, talk. – de Roo, M., Natuurkunde in 2010, Information for VWO high school pupils, Groningen, the Netherlands, 13 April 2007. – Dijkgraaf, R.H., Hoe?Zo!, Teleac televisie serie, 2007. – Dijkgraaf, R.H., String Theory, FOM/Shell workshop, 10 January 2007, talk. – Dijkgraaf, R.H., Goedemorgen NL, KRO televisie, 10 January 2007, interview. – Dijkgraaf, R.H., E´enVandaag, TROS-AVRO televisie, De B`etacanon,11 January 2007, interview. – Dijkgraaf, R.H., Tijd voor twee, KRO radio, Frits Spits, 15 January 2007, interview. – Dijkgraaf, R.H., Club van 100, RVU radio, 17 January 2007, interview. – Dijkgraaf, R.H., Techniek wordt de taal van de wereld, in: Metalektro Profiel, Feb- ruary 2007, interview. – Dijkgraaf, R.H., Kinderen en wetenschap, Veldconferentie Talenten Kracht, Rhenen, 4 February 2007, talk. – Dijkgraaf, R.H., Sturen zonder remmen, Nederlands Gesprekscentrum, Leusden, 17 February 2007, talk. – Dijkgraaf, R.H., Einsteins droom, Koninklijk Natuurkundig Genootschap, Gronin- gen, 20 February 2007, talk. – Dijkgraaf, R.H., Salongesprek, Hoger Onderwijsdag (VSNU/LSVB/ISO), Den Haag, 2 March 2007, talk. – Dijkgraaf, R.H., Introduction, Slotsymposium Mathematical Physics, Amsterdam, 9 March 2007, talk. – Dijkgraaf, R.H., Debat over snaartheorie, met Gerard t Hooft, Science Cafe, Nijme- gen, 13 March 13, 2007, debate. – Dijkgraaf, R.H., Lezing bij boekpresentatie Lachen om niets van Coen Simon, Utrecht, 14 March 2007, talk. – Dijkgraaf, R.H., Het quantum heelal, Hisparc leerlingensymposium, Amsterdam, 19 March 2007, talk. – Dijkgraaf, R.H., I love science, Spits, dagblad 21 March 2007, interview. – Dijkgraaf, R.H., Drift der disciplines, Symposium over de b`eta-disciplinesVU, 19 April 2007, talk. – Dijkgraaf, R.H., Tussen begrip en verwondering, 75 jaar TNO, Delft, 25 April 2007, 7. Science-related activities 103

talk. – Dijkgraaf, R.H., Debat studentenraadverkiezingen/week vd Amsterdamse student, 7 May 2007, talk. – Dijkgraaf, R.H., Powers of Ten, opening Artis Planetarium, 8 May 2007, talk. – Dijkgraaf, R.H., Creativiteit in de wetenschap, Madrid, 9 May 9, Barcelona, Spain, 10 May 2007, invited lectures. – Dijkgraaf, R.H., De wetenschappelijke sterkten van Nederland, Innovatieplatform, Den Haag, 31 May 2007, talk. – Dijkgraaf, R.H., Het uur van innovatie, participant debate Happy Chaos: Gren- zeloos, 25 May 2007, debate. – Dijkgraaf, R.H., D-branes and D-modules, 60ste verjaardag J.Steenbrink Radboud Universiteit Nijmegen, 1 June 2007, talk. – Dijkgraaf, R.H., Samenwerking UA-HvA, Universiteitsdag, 9 June 2007, debate. – Dijkgraaf, R.H., BNR nieuwsradio, 16 June 2007, interview. – Dijkgraaf, R.H., Tijdloze proefjes, opening tentoonstelling Proefjes!, Teyler mu- seum, Haarlem, 23 June 2007, talk. – Dijkgraaf, R.H., Radio 3 FM, 15 August 2007, interview. – Dijkgraaf, R.H., Met het oog op morgen, Radio 1, 16 August 2007, interview. – Dijkgraaf, R.H., Einstein 2.0, Coolpolitics, Lowlands University, Biddinghuizen, 19 August 2007, talk. – Dijkgraaf, R.H., Toespraak intreeweek UA, 27 August 2007, talk. – Dijkgraaf, R.H., SURF magazine, September 2007, interview. – Dijkgraaf, R.H., Hypothese no.3, September 2007, interview. – Dijkgraaf, R.H., website Coolpolitics /Icons, September 2007, interview. – Dijkgraaf, R.H., Het literaire element in de exacte wetenschappen, UvA Alumni Lecture, New York, USA, 4 September 2007, lecture. – Dijkgraaf, R.H., De b`etacanon, Studium Generale TU Eindhoven, 5 September 2007, talk. – Dijkgraaf, R.H., Beeld & Geluid, in Zomergasten, 8 September 2007, interview. – Dijkgraaf, R.H., Alg. Nijmeegs Studentenblad, 10 September 2007, interview. – Dijkgraaf, R.H., Viertakt, NPS radio, 12 September 2007, interview. – Dijkgraaf, R.H., Het begin van de tijd, 20-jarig bestaan Dehora, Omniversum, Den Haag, 19 September 2007, talk. – Dijkgraaf, R.H., Radio 1 journaal, interview over wiskundefilm Platform B`etatechniek, 21 September 2007, interview. – Dijkgraaf, R.H., Opening Spui 25, 24 September 2007, talk. – Dijkgraaf, R.H., Microtalk, Discovery 07, 28 September 2007, talk. – Dijkgraaf, R.H., Metro, dagblad, 5 October 2007, interview. – Dijkgraaf, R.H., Einsteins droom, NWG, Assen, 9 October 2007, talk. – Dijkgraaf, R.H., Forumdebat, Internationale conferentie over kunstonderwijs, Felix Meritis, 10 October 2007, talk. – Dijkgraaf, R.H., Symposium NWO, videoboodschap, 12 October 2007, talk. – Dijkgraaf, R.H., Wat ons bindt, tafelgast, dialoogavond, Rode Hoed, Amsterdam, 22 October 2007, debate. – Dijkgraaf, R.H., De wetenschap heeft (n)iets te vertellen, Spui 25, over de raakvlakken tussen wetenschap, maatschappij en kunst, 24 October 2007, talk. 104 Annual report 2007

– Dijkgraaf, R.H., Pauw en Witteman, VARA televisie, tafelgast, 1 November 2007, debate. – Dijkgraaf, R.H., The quantum universe, Rijksakademie, 2 November 2007, talk. – Dijkgraaf, R.H., Wonderboy in de wetenschap, in: Trouw, 9 November 2007, inter- view. – Dijkgraaf, R.H., String theory and the quantum universe, International Festival for Astronomy, Bunnik, 9 November 2007, talk. – Dijkgraaf, R.H., Eindhovens Dagblad, 12 November 2007, interview. – Dijkgraaf, R.H., Avro op de middag, Radio 1, 12 November 2007, interview. – Dijkgraaf, R.H., The quantum universe, Kroniglezing over snaartheorie, Delft, 14 November 2007, talk. – Dijkgraaf, R.H., How one becomes lonely: Einstein en Sch¨onberg, i.s.m. Sch¨onberg Ensemble, Eindhovens Muziekcentrum, 16 November 2007, talk. – Dijkgraaf, R.H., Bruggen in het b`etaonderwijs, congres Bruggen Bouwen, Utrecht, 16 November 2007, talk. – Dijkgraaf, R.H., Embedded Science, Nederlands Gesprekscentrum, Leusden, 18 November 2007, talk. – Dijkgraaf, R.H., Desmet Live, Radio 1, 20 November 2007, interview. – Dijkgraaf, R.H., Whos Next RTL7 televisie, 21 November 2007, interview. – Dijkgraaf, R.H., Kansberekeningen, Spontaniteit in kunst en wetenschap, KNAW, Amsterdam, 22 November 2007, talk. – Duine, R., Bose-Einstein condensatie en de kat van Schr¨odinger, Utrecht, intro- ductie 1e jaars studenten, 3 September 2007. – Ernst, M., Globale opwarming, CS Argo, Anne Frank Huis, Amsterdam, 10 March 2007. – Ernst, M., Globale opwarming, Probus 85, Hotel Oud London, Zeist, 13 March 2007. – Kleiss, R.H.P., LUX - verlicht de geest, IKON television, 21 October 2007. – Loll, R., The triangular universe, Scientific American News Scan, by Mark Alpert, Scientific American, print edition, February 2007. – Loll, R., The amazing physics of ’nothing’, popular physics talk, WISER Fest- ival (Women in Science, Education and Research), Maastricht, the Netherlands, 4 October 2007. – Loll, R., Quanten-Raumzeit aus dem Nichts, Spektrum der Wissenschaft Spezial: Ist das Universum ein Computer?, November 2007, pp. 68-74. – Loll, R., Topwetenschapper moet op een voetstuk, interview with Robert Visscher, in Transfer 15, no. 2, Nuffic, Den Haag, November 2007. – Prokopec, T., Do magnetic fields drive dark energy?, Z. Merali, New Scientist 2605, 23 May 2007. – Schoutens, K., De vreemdheid van quantummaterie en de Fibonacci quantumcom- puter, Viva Fysica, UvA, Amsterdam, January 26, 2007, talk. – Schoutens, K., with Verlinde, E.P., Quantumlessen, presentatie college Quantum- lessen, UvA Nacht van de Wetenschap, Amsterdam, June 16, 2007, talk. – Schoutens, K., Quantum ICT – over quantummechanica en computers, NSA ouder- dag, November 24, 2007, talk. – Schoutens, K., Gastvoordracht, Conferentie van rectoren zelfstandige gymnasia, 7. Science-related activities 105

Nunspeet, the Netherlands, December 13, 2007, talk. – ’t Hooft, G., Nobelprijswinnaar Gerard ’t Hooft, interview in ‘Profielen’, magazine Hogeschool Rotterdam, the Netherlands, 1 February 2007. – ’t Hooft, G., Interview with Igor Zolnerkevic, Journal UNESP, S˜aoPaulo, Brazil, 4 February 2007. – ’t Hooft, G., Interview with Cassio Leite Vieira, Science writer, Rio de Janeiro, Brazil, 6 February 2007. – ’t Hooft, G.,Kennis in Nederland verdwijnt, interview in ‘In Tune’, magazine of Getronics PinkRoccade, no. 2, 2007. – ’t Hooft, G., Discussion on ‘String theory’, with R. Dijkgraaf and audience, Science Cafe, Debatavond, The Shamrock, Nijmegen, the Netherlands, 13 March 2007. – ’t Hooft, G., Science = fiction, popular lecture, Harvard Club of the Netherlands, Soci¨eteitde Witte, Den Haag, the Netherlands, 22 March 2007. – ’t Hooft, G. Do we have a road map? in series of ‘Cafe crossfire’, evening debates on Europe’s Innovation-driven Future, participation in panel with J. Manuel Barroso (president of the European Communion), J. v.d. Veer (Chief Executive Royal Dutch Shell plc.), Brussel, Friends of Europe, in association with Shell, 26 March 2007. – ’t Hooft, G., De rand van het heelal, Nacht van de Ratio, Unitas Studiosorum Utrecht, the Netherlands, 28 March 2007. – ’t Hooft, G., Speech at the presentation of the HSP scholarship diploma’s to foreign students, Museon, Den Haag, the Netherlands, 19 April 2007. – ’t Hooft, G., Fysisch Wereldbeeld, lectures for non-physicists, with T. Arts and W. v.d. Weg, 24 April-26 June 2007. – ’t Hooft, G., Speech at the presentation of HSP scholarships to dutch students abroad, Schouwburg, Den Haag, the Netherlands, 5 June 2007. – ’t Hooft, G., Kronkels en singulariteiten in ruimte en tijd, college Kaleidoscoop, Utrecht, the Netherlands, 13 June 2007. – ’t Hooft, G., A few words on ‘Relativity’, officially received first copy of ‘De Sub- lieme Eenvoud van relativiteit’ by S. Bais, Amsterdam, the Netherlands, 27 June 2007. – ’t Hooft, G., De allerkleinste brokjes materie, lecture, Amadeus Lyceum, De Meern, plus presentation of diploma’s, 29 June 2007. – ’t Hooft, G., Discussion on the VWO exams in physics for ‘Kennisnet’, 6 July 2007. – ’t Hooft, G., “Gerard denkt vanaf de grond (promovendi aan het woord)”, article in ’de Volkskrant’ by M. van Calmthout, 15 September 2007. – ’t Hooft, G., Volkskrant Kenniscaf´e,Debate on ‘De heilige graal van de natuurkunde’, with M. van Calmthout and M. van Rossem, Utrecht, the Netherlands, 17 Septem- ber 2007. – ’t Hooft, G., Onze plaats in het universum, guest lecture, Avicenna, Mari¨enhof, Amersfoort, the Netherlands, 1 October 2007. – ’t Hooft, G., The human element in a deterministic world, Conference on “Sci- ence without boundaries”, Institute Para Limes, Landgoed Ehzerwold, Almen, the Netherlands, 9 October 2007. – ’t Hooft, G., Panel discussion with C. Townes and C. Rubbia on “Future Changes: Globalization, Innovation and Entrepreneurship”, moderators: B. Piccard and W. 106 Annual report 2007

Amelio, Festival of Thinkers, 21-25 October, Higher College of Technology, Abu Dhabi, Dubai, UAE, 22 October 2007. – ’t Hooft, G., Topwetenschapper moet op een voetstuk, interview with Robert Vis- scher, in Transfer 15, no. 2, Nuffic, Den Haag, the Netherlands, November 2007. – ’t Hooft, G., Mega Zwart Gat, interview with F. van Zeijl, Ublad, blz. 13, 15 November 2007. – ’t Hooft, G., Beauty and truth in physics, Conference on “Aesthetics in Mathem- atics”, Utrecht, the Netherlands, 10 November 2007. – Vandoren, S., Theoretical physics and elementary particles, voorlichtingsdag, Utrecht University, Utrecht, the Netherlands, 9 November 2007. – van Roij, R., Soms mengen olie en water wel, en fysici uit Utrecht weten waarom, NRC, 3 November 2007 [about theoretical work by Jos Zwanikken and Ren´evan Roij, and experimental work by Mirjam Leunissen and Alfons van Blaaderen]. – van Baal, P., Gastles Speciale Relativiteitstheorie, TVO Nieuwerkerks College, Rotterdam, the Netherlands, 6 February 2007. – van den Horn, L.J., In het kielzog van Kelvin, KNVWS Vesta, National Science Day, 21 October 2007, invited talk. – van der Schaar, J.P., Alles uit (bijna) niets ons absurde heelal, VIVA FYSICA 2007, UA, 26 January 2007, talk. – van der Schaar, J.P., Voorlichting Natuurkunde/Sterrenkunde, Voorlichtingsbijeenkomst Zaanlands Lyceum, Zaandam, 6 February 2007, talk. – van der Schaar, J.P., Alles uit Niets, Paradisolezing, Paradiso, Amsterdam, 6 May 2007, talk. – van der Schaar, J.P., Alles uit Niets, Studium Generale Technische Universiteit Delft, 11 September 2007, talk. – Verlinde, E.P., Newton’s Strand, Interview in NRC Zomerbijlage, NRC Handels- blad, 21 June 2007, interview. – Verlinde, E.P., Donkere materie, Rotary Amsterdam West, Groote Industri¨ele Club, Amsterdam, 13 February 2007, talk. 8 Research funding

Below an overview is presented of funding organizations that financially supported the research of the DRSTP in 2007. Regular university funding is not listed.

8.1 Personal grants

University grants - University USF grant VUA, F.C. MacKintosh (VUA) (2001-2007) - High Potentials grant UU, R. van Roij (UU) (2005-2010)

KNAW - Academy professorship, G. ’t Hooft (UU) (2005-2010)

NWO - Spinoza grant (1999), C.W.J. Beenakker (UL) (2000-2009) - Spinoza grant (2003), R.H. Dijkgraaf (UvA)(2004-2008) - Spinoza grant (2006), J. Zaanen (UL) (2006-2011) - NWO-Vernieuwingsimpuls (2003), K. Skenderis (UvA) (2003-2007) - VICI grant (2002), H.T.C. Stoof (UU) (2003-2008) - VICI grant (2003), A. Ach´ucarro(UL) (2004-2009) - VICI grant (2004), R. Loll (UU) (2005-2010) - VICI grant (2007), C. Morais Smith (2008-2013) - VIDI grant (2004), K.E. Schalm (UvA/UL) (2005-2009) - VIDI grant (2004), M.M. Taylor (UvA) (2005-2009) - VIDI grant (2005), K. Peeters (UU) (2006-2011) - VIDI grant (2007), R.A. Duine (2008-2013) - VENI grant (2006), L.F. Alday (UU) (2006-2008) - VENI grant (2006), J. Baptista (UvA) (2006-2010) - VENI grant (2007), M. Das (VUA) (2007-2011) - VENI grant (2007), A.S. de Wijn (RU) (2008-2011)

EU Marie Curie fellowships - G.S. Krishnaswami (UU), Large-N Yang-Mills Theory, (1 October 2005 - 1 October 2007). - F.S. Saueressig (UU), A new string duality for gauged supergravity and its physical and mathematical applications, (1 November 2005 - 1 September 2007). - H. Sahlmann (UU), Non-perturbative path integrals for quantum gravity, (18 October 2006 - 18 October 2008) 108 Annual report 2007

- T. Quella (UvA), Conformal field theories with Lie superalgebra symmetry and string backgrounds with fluxes, (1 September 2007 - 1 September 2009)

8.2 FOM funding

- FOM-A-01 (group leader F.A. Bais) Fundamental interactions (FOM programme 31) 99FI01: Fundamental interactions (F.A. Bais, J. Smit) 02FI02: Holographic aspects of string theory structure of QCD (J. de Boer) 02FI10: Fundamental interactions (F.A. Bais) 02FI11: Fundamental interactions (J. Smit)

- FOM-A-05 (group leader B. Nienhuis) Collective and cooperative statistical physical phenomena (FOM programme 46) 04CCSPP26: Correlations in groundstates without finite size corrections (B. Nienhuis)

- FOM-A-13 (group leader A.M.M. Pruisken) Strongly interacting condensed matter (FOM programme 34) 02SIC15: Studying duality and topological excitations in disordered materials (A.M.M. Pruisken)

- FOM-A-15 (group leader Th.M. Nieuwenhuizen) Strongly interacting condensed matter (FOM programme 34) 02SIC16: Thermodynamics and measurement in the quantum world: challenging the validity of standard knowledge (Th.M. Nieuwenhuizen)

- FOM-A-20 (group leader R.H. Dijkgraaf till 1 July 2007, E.P. Verlinde from 1 July 2007) Mathematical physics (FOM/GBE programme 11) 01MF08: Holography and topological invariants (J. de Boer) String theory and quantum gravity (FOM programme 57) 01STQG01: Thermodynamics of strings, fluxes and branes (R.H. Dijkgraaf and J. de Boer) 02STQG07: Matrix models and supersymmetric gauge theory (R.H. Dijkgraaf) 02STQG08: String theory beyond supergravity (J. de Boer) Projectruimte 02PR2149: String theory and cosmology (J. de Boer) 03PR2266: Supersymmetric gauge theories and matrix models (R.H. Dijkgraaf and J. de Boer) 04PR2387: Connecting gauge interactions with gravity through string theory (R.H. Dijkgraaf and E.P. Verlinde) 06PR2510: Cosmological vacua in string theory (R.H. Dijkgraaf and E.P. Verlinde) 8. Research funding 109

- FOM-A-25 (group leader K. Schoutens) Collective and cooperative statistical physical phenomena (FOM programme 46) 04CCSPP23: The challenges of the chiral metal (J.-S. Caux) 04CCSPP24: Collective behavior vs entanglement in atomic matter (K. Schoutens) FOM-Springplankplaatsen 02SP002: FOM-Springplankplaats (J.-S. Caux)(till 1 May 2007)

- FOM-G-01 (group leader E.A. Bergshoeff) Fundamental interactions (FOM programme 31) 02FI12: Braneworlds (E.A. Bergshoeff/M. de Roo) String theory and quantum gravity (FOM programme 57) 01STQG03: String theory and quantum gravity (E.A. Bergshoeff/M. de Roo) 02STQG06: Towards a formulation of coinciding M5-branes (E.A. Bergshoeff/ M. de Roo)

- FOM-G-18 (group leader A.C.D. van Enter) Mathematical physics (FOM/GBE programme 11) 99MF02: States and metastates in disordered lattice systems (M. Winnink/ A.C.D. van Enter)

- FOM-L-05 (group leader C.W.J. Beenakker) Photons in complex media (FOM Programme 45-2) 07WCM09: Photons in complex media: Theory (C.W.J. Beenakker) Graphene-based electronics (FOM Programme 101) 07GE02: Quantum transport in graphene (C.W.J. Beenakker) Projectruimte 04PR2285: Controlled quantum entanglement in the Fermi sea (C.W.J. Beenakker) 05PR2407: Antibunched and entangled microwaves in nanostructures (C.W.J. Beenakker) 06PR2504: Mesoscopic physics in graphene (C.W.J. Beenakker)

- FOM-L-07 (group leader W. van Saarloos) Collective and cooperative statistical physical phenomena (FOM programme 46) 04CCSPP15: Efficient statistical physical models for simulating macroscopic visco- elastic flow instabilities and turbulence (W. van Saarloos) 04CCSPP18: Quantum phases of ultracold strongly interacting atoms (P.J.H. Denten- eer) Physics of granular matter (FOM Programme 63) 03PGM03: Fundamental aspects of statics and dynamics of granular media (W. van Saarloos) 07PGM17: Response and scaling behavior of dense granular media near the jamming transition (W. van Saarloos) Rheophysics: Connecting Jamming and Rheology (FOM Programme 102) 07CJR07: Competition of Jamming and Shear Banding (W. van Saarloos) Projectruimte 03PR2263: Why is green flourescent protein green? A quantum Monte Carlo study 110 Annual report 2007

(C. Filippi) 05PR2438: When soft condensed matter gets hard: the “jamming transition” in gran- ular media (W. van Saarloos)

- FOM-L-15 (group leader J. Zaanen) Collective and cooperative statistical physical phenomena (FOM programme 46) 04CCSPP13: Quantum phase transitions and fermion signs (J. Zaanen) 04CSSPP31: Orbital physics in oxides: novel types of quantum order (J. van den Brink) Projectruimte 04PR2295: Stripe fractionalization: the quest for emergent gauge principle (J. Zaanen) 04PR2358: Does spontaneous symmetry breaking limit quantum coherence? (J. van den Brink) FOM-Springplankplaatsen 02SP001: FOM-Springplankplaats (J. van den Brink)

- FOM-L-26 (group leader H. Schiessel) Material properties of biological assemblies (FOM programme 90) 05MPBA09: Theory of the role and behavior of membranes in composite systems (H. Schiessel) 06PR2465: Statistical mechanics of semiflexible biopolymers under tension and com- pression (H. Schiessel)

- FOM-N-01 (group leader R.H.P. Kleiss) Fundamental interactions (FOM programme 31) 02FI15: Fundamental interactions (R. Kleiss) FOM-Springplankplaatsen 00SP: FOM-Springplankplaats 2000- 1 November 2007 (W.J.P. Beenakker)

- FOM-N-09 (group leader M.I. Katsnelson) Graphene-based electronics (FOM Programme 101) 07GE03: Graphene - based electronics (M.I. Katsnelson) Projectruimte 05PR2427: Magnetic adatom clusters on metal surfaces as tunable many-body sys- tems (M.I. Katsnelson) 06PR2481: Graphene: the two dimensional crystal that should not exist (A. Fasolino)

- FOM-U-01 (group leader G. ’t Hooft) Fundamental interactions (FOM programme 31) 02FI17: Fundamental interactions (G. ’t Hooft) Theoretical particle physics in the era of the LHC (FOM programme 104) 07TPP03: Naturalness and fundamental vs composite scalars (G. ’t Hooft)

- FOM-U-07 (group leader H. van Beijeren) Collective and cooperative statistical physical phenomena (FOM programme 46) 8. Research funding 111

00CCSPP09: Nonequilibrium systems and SRB measures (H. van Beijeren)

- FOM-U-29 (group leader B. de Wit) String theory and quantum gravity (FOM programme 57) 01STQG02: New approaches to hypermultiplets/local field theory couplings of BPS states (B. de Wit) 02STQG09: Non-perturbative quantum black holes (R. Loll) 02STQG10: Instantons in string theory (S. Vandoren/G. ’t Hooft) Projectruimte 07PR2522: What curves the space-time at large scales? The quest for the origin of dark energy of the universe (T. Prokopec)

- FOM-U-31 (group leader R. van Roij) Structure, function and flow of soft materials (FOM programme 27) 01SFFSM30: Phase behaviour, structure and dynamics of colloidal suspensions (R. van Roij) Projectruimte 03PR2241: Inhomogenous suspensions of charged colloids: voids, sedimentation, wet- ting and nucleation (R. van Roij) FOM/DFG Physics of colloidal dispersions in external fields (FOM programme 61) in collaboration with DFG (transregio SFB 6018) Duration: 2002-2008 Scientist in charge: A. van Blaaderen (UU) Coordinator DFG: H. L¨owen (D¨usseldorf,Germany) Participating theorist: R. van Roij (UU)

- FOM-V-01 (group leader P.J. Mulders) Fundamental interactions (FOM programme 31) 02FI18: Fundamental interactions (P.J. Mulders) Theoretical particle physics in the era of the LHC (FOM programme 104) 07TPP04: Theoretical particle physics in the era of the LHC (D. Boer and P.J. Mulders) Projectruimte 04PR2302: Exposing the color glass condensate (D. Boer) 05PR2422: Time reversal odd phenomena in quantum chromodynamics (P.J. Mulders) 07PR2547: Color flow in hard hadronic scattering processes (P.J. Mulders)

- FOM-V-13 (group leader F.C. MacKintosh) Biomolecular physics (FOM programme 60) 03BMP23: Micromechanics and active response of biopolymer networks (F.C. MacKintosh) Material properties of biological assemblies (FOM programme 90) 05MPBA04: Cytoskeletal/filamentous protein networks and assemblies (F.C. MacKintosh) 05MPBA05: Active cytoskeletal protein assemblies (G. Koenderink/ F.C. MacKintosh) 112 Annual report 2007

05MPBA06: Microrheology and non-equilibrium fluctuations of active cytoskeletal networks (F.C. MacKintosh/G. Koenderink) 05MPBA10: Guest budget (F.C. MacKintosh) 05MPBA11: Personal budget, program leader (F.C. MacKintosh) Rheophysics: connecting jamming and rheology (FOM programme 102) 07CJR03: Modelling of non-affine deformations and flow (F.C. MacKintosh)

8.3 EU-networks

- Hadron physics (integrated infrastructure initiative RII3-CT-2004-506078) Duration: 2004-2007 Network coordinator: C. Guaraldo (Frascati, Italy) Scientist in charge for VUA: P.J. Mulders

- Fundamentals of nanoelectronics (MRTN-CT-2003-504574) Duration: 2004-2008 Network coordinator: University of Lancaster, UK Scientist in charge for UL: C.W.J. Beenakker

- Soft matter composites-an approach to nanoscale functional materials (6th framework programme, network of excellence 502235-2) Duration: from 01-06-2004 until 01-06-2009 Network coordinator: D. Richter (J¨ulich, Germany) Scientists in charge: A. van Blaaderen/H. Lekkerkerker Participating theorist: R. van Roij (UU)

- Constituents, fundamental forces and symmetries of the universe (MRTN-CT-2004- 005104) Duration: from 01-11-2004 until 31-10-2008 Network coordinator: D. L¨ust(Munich, Germany) Scientist in charge for RUG: E.A. Bergshoeff Scientist in charge for UU: B. de Wit

- Superstring theory (MRTN-CT-2004-512194) Duration: from 01-01-2005 until 31-12-2009 Network coordinator: L. Brink (G¨oteborg, Sweden) Scientist in charge for UvA: R.H. Dijkgraaf Scientist in charge for UU (associated with UvA): G. ’t Hooft

- European network on random geometry (MRTN-CT-2004-005616) Duration: from 01-09-2005 until 31-08-2009 Network coordinator: R. Loll (UU)

- HEPTOOLS (MRTN-CT-2006-035505) 8. Research funding 113

Duration: from 01-12-2006 until 30-11-2010 Network coordinator: Dr. C.G. Papadopoulos (NRCS Dimokritos, Greece) Scientist in charge for RU: R.H.P. Kleiss

- Flavour Physics Training network FLAVIAnet Duration: 2006 - Network coordinator: A. Pich (Valencia U., Spain) Scientist in charge for RUG (associated with Valencia): E. Pallante

8.4 ESF

- Programme towards atomistic materials design (Psi-k) (ESF) Duration: 2003-2008 Network coordinator: V. Heine (Cambridge) Scientist in charge for UL: C. Filippi

- Interdisciplinary statistical and field theory approaches to nanophysics and low dimensional systems (INSTANS) Duration: 2005-2010 Network coordinator: G. Mussardo (SISSA, Trieste). Scientist in charge for UvA: K. Schoutens

8.5 Other

NWO - Mathematical Physics project (D. Lenstra, B. Krauskopf) (VUA) Dynamics of patterns: delay dynamics of laser patterns (K. Green)

- Geometric aspects of quantum theory and integrable systems (NWO-047017015) Duration: from 30-10-2005 until 30-10-2008 Network coordinator: G. Helminck (University of Twente) Scientist in charge: G. Arutyunov (UU)

- NWO ECHO grant: Charged colloidal rods in suspension: screening, twisting, de- mixing, and ordering, R. van Roij (UU) (2008-2012)

- NWO visitor grant: Hidden symmetries and their relation to black hole entropy (B63- 252) K. Maharana (Utkal University, Bhubaneswar, India) 1 May 2007 - 1 July 2007 host: G. ’t Hooft

- NWO visitor grant: Extremal black holes and entropy in string theory (B66-148) S. Mahapatra (Utkal University, Bhubaneswar, India) 114 Annual report 2007

1 May 2007 - 1 July 2007 host: B. de Wit

STW - VTF 7803 (T. Visser) (VUA): Using light better (T. Stegeman) - ETC 5963 (D. Lenstra) (VUA): Towards ultrafast communication (Freeband Com- munication Programme) (W. Wang)

INTAS - Strings, branes and higher-spin gauge fields (INTAS-03-51-6346) Duration: from 01-11-2004 until 31-10-2007 Network coordinator: A. Sagnotti (Rome) Scientist in charge: B. de Wit (UU)

- Extended supersymmetry, strings and non-commutativity in field theory (INTAS-05- 1000008-7928) Duration: 2006-2008 Scientist in charge: E. Bergshoeff (RUG)

UU grant - Prestige masters grant (UU) (2004-2008) 9 Organisation DRSTP 2007

Governing board: prof. dr. M. de Roo (RUG) 050-3634956 [email protected] prof. dr. R.H.P. Kleiss (RU) 024-3653283 [email protected] prof. dr. F.C. MacKintosh (VUA) 020-5987857 [email protected] prof. dr. K. Schoutens (UvA), chair 020-5255664 [email protected] prof. dr. H. van Beijeren (UU) 030-2532805 [email protected] prof. dr. J. Zaanen (UL) 071-5275506 [email protected]

Scientific director: prof. dr. B. de Wit (UU) 030-2532965 [email protected]

Managing director: drs. B.C. Meijerman 030-2537549 [email protected]

Bureau: W.L. Verweij 030-2535916 [email protected] Scientific advisory committee: prof. dr. J. Fr¨ohlich, ETH Z¨urich, Z¨urich, Switzerland prof. dr. D. Nelson, Harvard University, Cambridge, USA prof. dr. S. Sachdev, Harvard University, Cambridge, USA prof. dr. G. Sawatzky, University of British Columbia, Vancouver, Canada prof. dr. G. ’t Hooft, Utrecht University, Utrecht, the Netherlands prof. dr. F. Wilczek, Massachusetts Institute of Technology, Cambridge, USA Educational board: prof. dr. G.T. Barkema (UU) 030-2532954 [email protected] dr. P.A. Bobbert (TUE) 040-2474352 [email protected] prof. dr. J. de Boer (UvA) 020-5255769 [email protected] dr. P.J.H. Denteneer (UL) 071-5275508 [email protected] prof. dr. A. Fasolino (RU) 024-3652222 [email protected] prof. dr. E. Laenen (NIKHEF) 020-5925127 [email protected] prof. dr. P.J.G. Mulders (VUA), 020-5987863 [email protected] chair dr. E. Pallante (RUG) 050-3633420 [email protected] (from June ‘07) prof. dr. A.C.D. van Enter (RUG) 050-3634967 [email protected] (until June ‘07) drs. G.C. Stavenga (UU), representative PhD students council 116 Annual report 2007

PhD students council: drs. A.J. Beekman (UL) 071-5275530 [email protected] (from May ‘07) drs. M.O. de Kok (UL) 071-5275531 [email protected] (until May ‘07) drs. L. Huijse (UvA) 020-5257305 [email protected] drs. T.A. Nutma (RUG) 050-3634959 [email protected] drs. G.C. Stavenga (UU) 030-2535907 [email protected] drs. J.W. Wagenaar (RU) 024-3652800 [email protected] drs. E. Wessels (VUA) 020-5987877 [email protected] 10 Addresses

University of Amsterdam (UvA) Institute for Theoretical Physics Faculty of Science Valckenierstraat 65 1018 XE Amsterdam tel.: 020-5255773 fax: 020-5255778 e-mail: [email protected] website: http://www.science.uva.nl/research/itf/

Vrije Universiteit Amsterdam (VUA) Theoretical Physics Department of Physics and Astronomy Faculty of Sciences De Boelelaan 1081 1081 HV Amsterdam tel.: 020-5987892 fax: 020-5987992 e-mail: [email protected] website: http://www.nat.vu.nl/en/sec/theo/

University of Groningen (RUG) Centre for Theoretical Physics Faculty of Mathematics and Applied Sciences Nijenborgh 4 9747 AG Groningen tel.: 050-3634950 fax: 050-3634947 e-mail: [email protected] website: http://www.rug.nl/natuurkunde/onderzoek/instituten/ctn/

Leiden University (UL) Instituut-Lorentz for Theoretical Physics Leiden Institute of Physics Faculty of Mathematics and Natural Sciences Niels Bohrweg 2 2333 CA Leiden P.O. Box 9506 2300 RA Leiden 118 Annual report 2007 tel.: 071-5275505/1535 fax: 071-5275511 e-mail: [email protected]; [email protected] website: http://www-lorentz.leidenuniv.nl/

Radboud University Nijmegen (RU) Institute for Molecules and Materials Faculty of Science Toernooiveld 1 6525 ED Nijmegen P.O. Box 9010 6500 GL Nijmegen tel.: 024-3652981 fax: 024-3652120 e-mail: [email protected] website: http://www.theorphys.science.ru.nl/

Institute for Mathematics, Astrophysics and Particle Physics Faculty of Science Toernooiveld 1 6525 ED Nijmegen P.O. Box 9010 6500 GL Nijmegen tel.: 024-3652098/2099 fax: 024-3652191 e-mail: [email protected] website: http://www.ru.nl/imapp/

Utrecht University (UU) Institute for Theoretical Physics Department of Physics and Astronomy Faculty of Science Leuvenlaan 4 3584 CE Utrecht P.O. Box 80.195 3508 TD Utrecht tel.: 030-2535928 fax: 030-2535937 e-mail: [email protected] website: http://www1.phys.uu.nl/wwwitf/

Associate groups Theoretical and Polymer Physics Group Eindhoven University of Technology Department of Applied Physics Research Cluster of Functional Materials 10. Addresses 119

Den Dolech 2 5612 AZ Eindhoven P.O. Box 513 5600 MB Eindhoven

NIKHEF Theory Group The National Institute for Nuclear Physics and High Energy Physics Kruislaan 409 1098 SJ Amsterdam P.O. Box 41882 1009 DB Amsterdam

Associate members prof. dr. H.A. de Raedt University of Groningen Department of Applied Physics Materials Science Centre Nijenborgh 4 9747 AG Groningen prof. dr. ir. H. Dekker University of Amsterdam Faculty of Science Institute for Theoretical Physics Valckenierstraat 65 1018 XE Amsterdam prof. dr. L.-F. Feiner Philips Research Lab High Tech Campus 4 5656 AA Eindhoven dr. B.J. Hoenders University of Groningen Department of Applied Physics Materials Science Centre Nijenborgh 4 9747 AG Groningen dr. ir. L.P.J. Kamp Eindhoven University of Technology Department of Applied Physics P.O. Box 513 5600 MB Eindhoven 120 Annual report 2007 prof. dr. J. Knoester University of Groningen Department of Applied Physics Materials Science Centre Nijenborgh 4 9747 AG Groningen prof. dr. D. Lohse University of Twente Faculty of Science and Technology Physics of Fluids P.O. Box 217 7500 AE Enschede prof. dr. R.G.E. Timmermans University of Groningen Kernfysisch Versneller Instituut Zernikelaan 25 9747 AA Groningen Appendix A Mission statement

Objectives The Dutch Research School of Theoretical Physics (DRSTP) is a cooperation between the theoretical physics groups of six Dutch universities with the following purpose:

to implement a joint programme of graduate education in theoretical physics • that draws upon a dynamic research environment;

to maintain and strengthen research in theoretical physics from a broad unifying • perspective that exploits the interrelationships between different fields of theory;

to strengthen, both in research and graduate education, connections with exper- • imental physics, and of multidisciplinary ties, for instance with mathematics, computational science, astrophysics, earth science, physical chemistry and the life sciences.

The DRSTP is based on the conviction that a joint venture of all the moderately sized local theory groups, each with its own profile, offers added value for the achievement of these objectives. The DRSTP represents a sizable part of the national activity in theoretical physics, a field that has a strong tradition in the Netherlands. At present there exists no other organization that represents this field of research at the na- tional level. The DRSTP welcomes further growth, for instance, by cooperation with institutions in neighbouring countries that share these goals. Often its educational activities already attract students from neighbouring countries and occasionally some of these activities are based on a close collaboration with partners abroad.

Mandate The governing board of the DRSTP, which consists of representatives of the partners, is responsible for undertaking any suitable initiative to further its goals. The scientific director of the DRSTP is responsible for implementing the overall policy on behalf of the board and for coordinating the DRSTP activities. The mandate to carry out these tasks is based on an official agreement between the boards of the participating universities, as a result of which the DRSTP has been accredited by the Royal Neth- erlands Academy of Arts and Sciences (KNAW) in June of 1994 and re-accredited in 1999 and 2004. The agreement guarantees means for a six year period in terms of explicit staff commitments as well as graduate student positions. The DRSTP is Annual report 2007 122 assisted in its endeavor by an international advisory committee of distinguished sci- entists.

Research Theoretical physics is based on universal principles. New concepts often have a much wider validity than in the field in which they are discovered, and methods developed in one field are sometimes very useful in another. Hence theoretical physics is char- acterized by unity in diversity. The research fields of the DRSTP are highly diverse, ranging from the physics at the very smallest length scales to the large scale structure of space and time, and from the study of building blocks of matter to the intricacies of the many-body physics of condensed matter, be it quantum matter, soft matter or bio-matter. The methods employed in these various fields make up the universal language of the- oretical physics: formalisms such as the renormalization group and quantum field theory, and various concepts of statistical, computational and mathematical physics are universally applied and establish cross-talk among the research fields. The research areas covered by the DRSTP can be grouped into the following broad and overlapping themes: Theme 1: Particle physics, cosmology, quantum gravity and string theory. • Theme 2: Quantum matter, quantum information, soft condensed matter and bio- physics.• The specific content of the research programme depends on the responsible project leaders, on their creativity as well as their initiative to obtain research funding from their home universities, the Dutch research councils of NWO, or from international sources such as European Union programmes. The research programme is carried out under the responsibility of the governing board and the scientific director in accordance with the agreement. The governing board of the DRSTP safeguards the objectives of the research school. It monitors the overall coherence and quality of the research programme. The board discusses periodically whether the programme remains on the forefront of international developments. The scientific advisory committee plays an essential part in these matters. The DRSTP is also accountable to the faculties of the participating universities. Therefore it reports regularly on past and planned activities, both in research and graduate education, on the basis of information presented in its yearly reports.

Graduate programme The six universities in the DRSTP offer a joint programme of graduate education lead- ing to a PhD. As part of the research training, under the supervision of a member scientist in a participating university, the Research School guarantees a wide range of educational opportunities for its PhD students. They consist of advanced courses, seminars and topical courses in the Netherlands, and international experience in the form of workshops, summer schools or extended research visits abroad. The governing board of the DRSTP decides on admission and monitors the evaluation of progress with a prognosis of ultimate success after the first year. This takes place on the basis of an “agreement of education and guidance” between each individual PhD student and its supervisor(s), to be submitted to and approved by the board 123 Appendix A upon admittance. A board of education advises the governing board. It also assembles the content of the yearly programme of regular activities. Standard advanced courses are published in a nationwide survey. Special PhD courses are offered within the DRSTP, in quantum field theory, statistical physics and in theoretical condensed matter physics, or result from joint efforts with other research schools. The input of graduate students in the school takes place in the form of a graduate student council that meets regularly with the director and the chairman of the gov- erning board and board of education (which also has one student member). Individual members of the DRSTP play a pivotal role in helping to organize many summer schools and workshops, in the Netherlands as well as abroad, and in serving as teachers in all the activities that the DRSTP undertakes by itself or in cooperation with others.

Other responsibilities The responsibilities of the DRSTP includes: the promotion of a stimulating research environment in theoretical physics • setting uniform standards of quality • making educational supplements available tailored to individual research needs. • The board also develops a wide range of activities in order to support an exciting research climate from fund-raising, e.g. for postdoctoral fellows, guest teachers or international mobility of DRSTP students, to the selection of visiting professors, for example on the Kramers (UU), Lorentz (UL) or Van der Waals (UvA) Chairs. Annual report 2007 124 Appendix B Selection and supervision procedure of PhD students

Selection and supervision of PhD students When a PhD research position opens up at one of the participating universities, there is usually an open round of applications. Important criteria in the selection procedure are the potential of the student for doing independent scientific research and the level and skills demonstrated in the master programme. Admission to the DRSTP requires to submit a ‘plan for training and supervision’ [opleidings- en begeleidingsplan], containing a global description of educational activ- ities with details provided for the first year. The plan also specifies how individual guidance will be provided under responsibility of the thesis advisor. The Research School safeguards a consistent implementation of the agreement, with uniform stand- ards. The plan has to be submitted to the DRSTP bureau. Formal admission is subject to approval by the governing board. After one year the progress is evaluated, based on an interview with the thesis advisor and an independent second referee. The school safeguards this procedure without in- terfering with the responsibilities of the employer. Participation in the educational programme is an explicit element of the evaluation: students are expected to attend at least two DRSTP postgraduate schools and the DRSTP symposium Trends in The- ory. The outcome of the evaluation will reflect on whether the student will be able to complete the research programme within the amount of time allotted. If the prognosis is negative, the student will be asked to leave the DRSTP. Such outcomes should be, and are, extremely rare provided proper care is given to the initial selection. A student can appeal a negative evaluation with the governing board of the school; a decision will be reached within one month. If the student does leave the school before completing the PhD, a diploma, specifying the student’s accomplishments in the educational programme, will be provided. After the first year, throughout the duration of the PhD project, the progress will be closely monitored, for example by additional yearly evaluation interviews. Annual report 2007 126 Appendix C Postgraduate AIO/OIO schools

Theoretical High Energy Physics

Date: 29 January - 9 February 2007

Twenty years ago the first postgraduate High Energy Physics School was organized near Apeldoorn (Wispelberg) in the Netherlands. A special edition of the same school (now part of the DRSTP educational program) was organized from 29 January to 9 February 2007 in Brazil in cooperation with the Jorge Andr´eSwieca Summer School and the Instituto de F´ısicaTe´orica(IFT/UNESP), S˜aoPaulo, Brazil. The first week of the DRSTP School overlapped with the second week of the Swieca Summer School. As a result the number of students in the first week was much higher than in the second week. The first week took place in hotel Le˜aoda Montanha (Campos do Jord˜ao);the venue of the second week was the Instituto de F´ısicaTe´oricain S˜aoPaulo. Scientific organizers from the Netherlands were J. Koch (NIKHEF/UvA) and K. Skenderis (UvA). Scientific organizers from Brazil were N. Berkovits (IFT/UNESP, S˜aoPaulo), G. Burdman (USP, S˜aoPaulo), M. Gandelman (UFRJ, Rio de Janeiro) and G. Krein (IFT/UNESP, S˜aoPaulo). The program included the following lectures (the number of lecture hours is given between parentheses):

Week 1: 29 January - 2 February R. Forty (CERN): Physics challenges of the LHC (3) Y. Nomura (Berkeley): Beyond the standard model (5) H. Ooguri (Caltech): Topological string theory (5) T. Plehn (Munich & Edinburgh): Collider phenomenology (5) K. Skenderis (UvA): Introduction to AdS-CFT (5) G. ’t Hooft (UU): Feynman rules and unitarity (5) J. Takahashi (UNICAMP): Relativistic heavy ions: probing the big bang at the LHC (2,5)

Week 2: 5 February - 9 February B. de Wit (UU): Entropy of BPS black holes (10) J. Smit (UvA/UU): Finite-temperature field theory (10) Annual report 2007 128

In the first week there was a broad program covering both abstract theory and ex- perimental particle physics. At the end of each day (except on Friday) a one hour discussion session was held in which all lecturers participated. In the second week the program consisted of two lecture courses of 10 hours each. In addition to these lecture courses, daily discussion/problem sessions were held in the afternoon (8 hours in total). In the second week seminars were given by: G. ’t Hooft (UU) entitled: An instability in the baryonic string (5 February) and S.P. Sorella (Rio de Janeiro) entitled: Issues on the quantization of Yang-Mills theories (8 February). The other evening presentations (15 minutes) were given by the PhD students. Eighteen (18) people participated. Thirteen (13) of them were from the Netherlands, three (3) participants came from Belgium (KU Leuven), one (1) from London (Im- perial College) and one (1) from the USA (Santa Cruz). In the first week (second week of the Swieca school), in addition to the eighteen (18) people registered through the DRSTP, an additional 110 people participated. Almost all of them came from Brazil. In the second week (at the Instituto de F´ısicaTe´oricain S˜aoPaulo) about six (6) Brazilian PhD students participated in the activities.

Participants (18): Atmaja, Ardian Nata (UvA) Machado, Pedro(UU) Boomsma, Jorn (VUA) Morisse, Alexander (Santa Cruz) El-Showk, Sheer (UvA) Nutma, Teake (RUG) Herck, Walter (KU, Leuven) Rees, Balt van (UvA) Hoogeveen, Joost (UvA) Reska, Paul (UU) Janssen, Tomas (UU) Rydt, Jan de (KU, Leuven) Kanitscheider, Ingmar (UvA) Stavenga, Gerben (UU) Leeuw, Marius de (UU) Vercnocke, Bert (KU, Leuven) Looyestijn, Hugo (UU) Zohren, Stefan (IC London)

Brazilian participants: Sonego Farias, Ricardo Luciano Bedoya Delgado, Oscar Cassol Seewald, Nadiane Cristina Mafra, Carlos Roberto Rabelo de Queiroz, Amilcar Lauridsen Ribeiro, Pedro

Student presentations: Jorn Boomsma (VUA): Light-front dynamics of the Yukawa model. A study of regu- larisation methods applied to the box diagram Sheer El-Showk (UvA): Open G2 strings Walter Herck (KU, Leuven): General coordinate transformations and matrixcoordin- ates of multiple D-branes Joost Hoogeveen (UvA): Pure spinor formalism Tomas Janssen (UU): Vacuum properties of nonsymmetric gravity 129 Appendix C

Ingmar Kanitscheider (UvA): The fuzzball proposal for black holes and AdS/CFT 5 Marius de Leeuw (UU): S-matrix for strings on AdS5xS Hugo Looyestijn (UU): Instantons and moduli stabilization in type IIA supergravity Pedro Machado (UU): Can one hear the shape of a fractal spacetime? Alexander Morisse (Santa Cruz): Towards a quantum theory of de Sitter space Taeke Nutma (RUG): The equivalence of Scherk-Schwarz I, II, and I+II Balt van Rees (UvA): Wormholes in AdS3 Paul Reska (UU): Problems in quantum gravity Jan de Rydt (KU, Leuven): Action for gauged hypermultiplets in = 2 supergravity Gerben Stavenga (UU): Factorization and resummation in QCD N Bert Vercnocke (KU, Leuven): Black holes from = 2 supergravity in four dimen- sions N Stefan Zohren (IC London): The emergence of background geometry from quantum fluctuations Ricardo Luciano Sonego Farias (S˜aoPaulo): Stochastic dynamics of nonequilibrium scalar fields Oscar Bedoya Delgado (S˜aoPaulo): One-loop conformal invariance of type II super- string in curved background Nadiane Cristina Cassol Seewald (S˜aoPaulo): Thermodynamically equivalent Hamilto- nian method for studying dynamic phase transitions Carlos Roberto Mafra (S˜aoPaulo): Loop amplitudes using the pure spinor formalism for the superstring

Statistical Physics and Theory of Condensed Matter

Date: 23 - 27 April 2007

Location: Hotel & Conference Center De Bergse Bossen, Driebergen, the Netherlands

Scientific organisers: J. van den Brink (UL); R. van Roij (UU)

Lecturers: J.-S. Caux (UvA): Spin chains and 1D Bose gases: from integrability to dynamics H. Stoof (UU): Ultracold fermions K. Storm (UL): Statistical physics of biopolymers and membranes R. van Roij (UU): From liquids and electrolytes to colloidal suspensions

Guest lecturer: G. van Ginkel (Debye Institute, Utrecht): The position of Prof. Peter Debye in Nazi Germany in the period 1935 - 1940: an investigation of historical sources Annual report 2007 130

Participants (25): Ament, Luuk (UL) Makogon, Dmytro (UU) Beekman, Aron (UL) Mehmani, Bahar (UvA) Broedersz, Chase (VUA) Mesaros, Andrej (UL) Conti, Enrico (VUA) Scaramucci, Andrea (RUG) Eggen, Eelco (UU) Sepkhanov, Ruslan (UL) Emanuel, Marc (UL) Snyman, Izak (UL) Gubbels, Koos (UU) Torres Valderama, Aldemar (UU) Huijse, Liza (UvA) van der Holst, Jeroen (TU/e) Huisman, Liesbeth (UL) van der Vegte, Michiel (RUG) Idema, Timon (UL) van Dijk, Leon (TU/e) Koetsier, Arnaud (UU) Zozulya, Oleksandr (UvA) Kuipers, Jan (UU) Zwanikken, Jos (UU) Lim, Lih-King (UU)

Student presentations: Luuk Ament (UL): Probing magnons with X-rays Aron Beekman (UL): Quantum crystal melting Marc Emanuel (UL): Semiclassical buckling of stiff polymers Koos Gubbels (UU): Ultracold Fermi gases with a population imbalance Liza Huijse (UvA): Supersymmetric lattice models Liesbeth Huisman (UL): Modelling of 3D Actin-networks Timon Idema (UL): How molecular motors pull membrane tubes Jan Kuipers (UU): Recombination of phase space trajectories Dmytro Makogon (UU): Transport in quantum wires with oscillating impurities Ruslan Sepkhanov (UL): Transmission at the Dirac point of a photonic band structure Aldemar Torres Valderama (UU): Charged colloids: a many-body problem Michiel van der Vegte (RUG): Spin-Peierls transition in the frustrated system T iOCl Leon van Dijk (TU/e): Self assembly and optical properties of supramolecular aggreg- ates Oleksandr Zozulya (UvA): Entanglement in fermionic quantum Hall states Jos Zwanikken (UU): Charged colloids close to an oil-water interface: dielectric dis- continuity driven double layers destruction Appendix D DRSTP Symposium Trends in Theory 2007

Date: 31 May - 1 June 2007 Location: Conference Centre De Bron, Dalfsen, the Netherlands Lecturers: Thursday, 31 May G. Arutyunov (UU): In quest for the S-matrix of AdS/CFT G. Bauer (TU Delft): Spin-transfer torques and spin dynamics in nanostructures D. Nelson (Harvard Univ.): Neutral mutations and gene surfing in microorganisms K. Schalm (UvA): Searching for signatures of strings

An evening panel discussion was held (31 May) with the topic: String theory and quantum gravity with L. Smolin (Waterloo) and E. Verlinde (UvA), moderated by S. Bais (UvA).

Friday, 1 June A. Fasolino (RU/UvA): Graphene between hard and soft matter J. Fr¨ohlich (ETH Z¨urich): Atomism and quantization V. Icke (UL): Radiation hydrodynamics in the universe E. Laenen (NIKHEF/UU): Theory for LHC M. Mostovoy (RUG): PT-symmetry breaking in solids: magnetically induced ferro- electricity R. van Roij (UU): Suspensions of charged colloids: in bulk and near oil-water inter- faces

All members of the DRSTP advisory board (with the exception of F. Wilczek) at- tended the symposium. On the evening preceding the symposium the advisory board met with the DRSTP governing board. A presentation was given by the DRSTP director reviewing the present status of the research school, which was followed by an in-depth discussion. During the symposium the members of the advisory board met with the members of the PhD students council. Annual report 2007 132

Participants (108): drs. L. Ament (UL) drs. L. Kampmeijer (UvA) drs. X. Arsiwalla (UvA) drs. I. Kanitscheider (UvA) dr. G. Arutyunov (UU) prof. dr. J. Knoester (RUG) drs. A. N. Atmaja (UvA) drs. A. Koetsier (UU) prof. dr. Ir. S. Bais (UvA) dr. G. Krishnaswami (UU) prof. dr. G. Barkema (UU/UL) dr. F. Kr¨uger(UL) prof. dr. G. Bauer (TU Delft) drs. J. Kuipers (UU) drs. P. Becherer (UL) prof. dr. E. Laenen (NIKHEF/UU) drs. A. Beekman (UL) prof. dr. A. Lande (KVI, RUG) prof. dr. E. Bergshoeff (RUG) drs. B. Leurs (UL) dr. P. Bobbert (TU/e) drs. L.-K. Lim (UU) dr. P. Bongaarts (UL) prof. dr. R. Loll (UU) drs. J. Boomsma (VUA) drs. H. Looyestijn (UU) dr. J.-S. Caux (UvA) drs. P. Machado (UU) drs. W. Chemissany (RUG) drs. D. Makogon (UU) drs. M.C.-N. Cheng (UvA) drs. J. Manschot (UvA) drs. E. Conti (VUA) dr. P. McFadden (UvA) dr. D. Danova (VUA) drs. B. Mehmani (UvA) I. De Baetselier (RUG) drs. A. Mesaroˇs(UL) drs. M. de Kok (UL) drs. I. Messamah (UvA) drs. M. de Leeuw (UU) prof. dr. C. Morais Smith (UU) prof. dr. M. de Roo (RUG) dr. M. Mostovoy (RUG) drs. M. de Vroome (UU) drs. P. Motylinski (NIKHEF) prof. dr. B. de Wit (UU) prof. dr. D. Nelson (Harvard) dr. P. Denteneer (UL) prof. dr. B. Nienhuis (UvA) drs. A. Deuzeman (RUG) dr. T. Nieuwenhuizen (UvA) prof. dr. R. Dijkgraaf (UvA) drs. T. Nutma (RUG) dr. R. Duine (UU) dr. E. Pallante (RUG) drs. E. Eggen (UU) dr. T. Prokopec (UU) drs. S. El-Showk (UvA) drs. P. Reska (UU) drs. M. Emanuel (UL) prof. dr. S. Sachdev (Harvard) dr. A. Faribault (UvA) drs. P. Salmi (UL) prof. dr. A. Fasolino (RU/UvA) prof. dr. G. Sawatzky (UBC Vancouver) prof. dr. J. Fr¨ohlich (ETH Z¨urich) drs. A. Scaramucci (RUG) dr. F. Gmeiner (NIKHEF) dr. K. Schalm (UvA) drs. K. Gubbels (UU) prof. dr. B. Schellekens (NIKHEF/RU) drs. J. Hartong (RUG) prof. dr. K. Schoutens (UvA) drs. L. Hollands (UvA) dr. E. Sezgin (Texas A&M Univ.) drs. J. Hoogeveen (UvA) drs. J.-H. She (UL) drs. L. Huijse (UvA) prof. dr. J. Smit (UvA) drs. L. Huisman (UL) prof. dr. L. Smolin (Waterloo) prof. dr. V. Icke (UL) drs. G. Stavenga (UU) drs. T. Idema (UL) prof. dr. K. Stelle (IC London) drs. T. Janssen (UU) prof. dr. G. ’t Hooft (UU) drs. A. Kadosh (RUG) dr. B. Tighe (UL) 133 Appendix D

drs. A. Torres Valderrama (UU) prof. dr. P. van Baal (UL) prof. dr. J. van den Brink (UL/RU) ir. M. van der Meulen (UvA) drs. M. van der Vegte (RUG) prof. dr. J.-W. van Holten (NIKHEF/VUA) ir. B. van Rees (UvA) dr. R. van Roij (UU) drs. J. van Wezel (UL) dr. S. Vandoren (UU) prof. dr. E. Verlinde (UvA) drs. S. Vlaming (RUG) ir. H. Vocks (UU) drs. J.W. Wagenaar (RU) dr. C. White (NIKHEF) prof. dr. J. Zaanen (UL) drs. Z. Zeravcic (UL) drs. J. Zwanikken (UU)

Poster presentations PhD students: Ament, L. (UL): Probing magnons with X-rays Arsiwalla, X. (UvA): Aspects of black rings in string theory Atmaja, A.N. (UvA): Photon and Dilepton production in AdS/QCD Becherer, P. (UL): Extensional flows of viscoelastic fluids Beekman, A. (UL): Quantum liquid crystals as Hopf-symmetry condensates Boomsma, J. (VUA): Light-front dynamics of the Yukawa model; a study of regular- isation methods applied to the box diagram Chemissany, W. (RUG): Pseudo-susy and geodesic motion in scalar cosmology (W. Chemissany, A. Ploegh and T. van Riet) Conti, E. (VUA): Simulations of semiflexible networks: nonaffine deformations and nonlinear elastic response de Leeuw, M. (UU): Bethe Ansatz in AdS/CFT Deuzeman, A. (RUG): Preconditioning hermitian domain wall fermions Eggen, E. (UU): Charged colloidal rods: pair interactions and excluded volume of fi- nite length charged colloidal rods El-Showk, S. (UvA): Exploring black hole microstates Emanuel, M. (UL): Semi-classical buckling of stiff polymers Gubbels, K. (UU): Sarma phase in trapped unbalanced fermi gases Hartong, J. (RUG): A new type of 7-brane Hollands, L. (UvA): Geometric Langlands Hoogeveen, J. (UvA): Amplitude prescriptions in string theory Huijse, L. (UvA): Supersymmetric lattice models Idema, T. (UL): Finding cell membrane parameters from giant vesicles Janssen, T. (UU): Vacuum properties of nonsymmetric gravity in the Sitterspace Annual report 2007 134

Kadosh, A. (RUG): Non-perturbative cosmological constraints for brane world scen- arios Kampmeijer, L. (UvA): Fundamental monopoles, dyons and fusion rules Kanitscheider, I. (UvA): The fuzzball proposal for blackholes and AdS/CFT Kuipers, J. (UU): Recombination of phase space trajectories Leurs, B. (UL): Quantum phases and nodal fermions in high-Tc superconductors Lim, L.-K. (UU): Effective staggered magnetic field in optical lattices Looyestijn, H. (UU): Instantons and moduli stabilization in type IIA supergravity Machado, P. (UU): Can one hear the shape of a fractal spacetime? Makogon, D. (UU): Transport properties of Luttinger liquids with oscillating impur- ities Manschot, J. (UvA): Black holes, circles and tori Mehmani, B. (UvA): Quantum state tomography with a single apparatus Messamah, I. (UvA): Another face of black holes Nutma, T. (RUG): From E11 to supergravity Ploegh, A. (RUG): Pseudo-susy and geodesic motion in scalar cosmology (W. Chemissany, A. Ploegh and T. van Riet) Reska, P. (UU): Wick rotations in quantum gravity Salmi, P. (UL): Numerical investigations of oscillons in two dimensions Scaramucci, A. (RUG): Thin film multiferroics Stavenga, G. (UU): Resummation in QCD Torres Valderama, A. (UU): An effective theory for effective colloidal interactions van der Meulen, M. (UvA): Classical approximation to quantum cosmological correl- ations van der Vegte, Michiel (RUG): Spin-Peierls transition in the frustrated system T iOCl van Rees, B. (UvA): Wormholes in 2+1 dimensions van Riet, T. (RUG): Pseudo-susy and geodesic motion in scalar cosmology (W. Chemissany, A. Ploegh and T. van Riet) van Wezel, J. (UL): Spontaneous decoherence in superconducting qubits Vlaming, B. (RUG): Exciton transport and trapping in biased systems Vocks, H. (UU): Long time simulations of dense polymer solutions Wagenaar, J.W. (RU): Soft core model for Meson-baryon interactions Zeravˇci´c,Z.ˇ (UL): Localization behavior of vibrational modes in granular packings Zozulya, O. (UvA): Entanglement entropy in fermionic Laughlin states Zwanikken, J. (UU): Charged colloids near an oil-water interface: dielectric discon- tinuity driven double layers destruction

Poster prize 2007 B. van Rees (UvA) won this year’s poster prize entitled: Wormholes in 2+1 dimen- sions. 135 Appendix D

Wormholes in 2+1 dimensions Balt van Rees and Kostas Skenderis ITFA, Universiteit van Amsterdam

t 1. What are they? ↑ Key properties We consider spacetimes ( , g) with a three-dimensional manifold and g a M M metric of signature ( + +) of constant negative curvature. The manifold has − M a topology S R with R the timelike direction and S a two-dimensional surface. – Three-dimensional spacetimes × We take S so that it has a boundary consisting of a number of circles; the spacetime – Nontrivial spatial surface S R has then cylindrical boundary components. These cylinders are infinitely × – Multiple asymptotic regions far away in the metric g. In fact, close to these boundaries, the spacetime looks just – Initial and final singularities like AdS3; we say they are asymptotically AdS3. The spacetimes end on a spacelike singularity in the future and in the past which – Horizons are shielded from the asymptotic regions by black and white hole horizons; this, – Asymptotically AdS3 and the nontrivial topology of S which can ‘connect multiple universes’, is why they are called wormholes [1, 2].

Spinoff 2. Why study them? Besides our main motivation we described on the AdS/CFT left, there are other interesting but unanswered The main motivation for studying the 2+1-dimensional worm- questions about these wormholes. For example, holes stems from the AdS/CFT correspondence. As can be read The AdS/CFT correspondence [3] is within the framework of semi-classical gravity we on the right, we do not yet understand the relation between global a conjectured duality between string can ask: properties of the bulk spacetime and boundary correlators. theory on d + 1-dimensional (‘bulk’) manifolds with a negative curvature – Do the wormholes emit Hawking radiation? These wormholes are interesting toy models because they have a metric and a d-dimensional (‘bound- – If yes, what is their temperature? very intricate global structure: nontrivial spatial topology, singu- ary’) quantum field theory. One can – larities and horizons. On the other hand, all this structure is hid- Can we associate an entropy to these spacetimes? think of the quantum field theory as den behind black and white hole horizons, outside of which the – Does there exist a well-defined ‘Wick-rotated’ living on the conformal boundary of spacetime is always the same (up to a parameter M, see the ’Co- counterpart of the wormholes with a positive def- the bulk spacetime. If this proposed ordinate systems’ section). This poses a challenge for AdS/CFT. inite metric? duality is correct, then the conformal This is because the dual quantum field theory lives on the confor- field theory contains a complete de- And at the level of classical general relativity: mal boundary of the bulk spacetime, so outside of the horizons. scription of the ‘bulk’ spacetime. It – Does the topology of the horizon change? Also, this theory respects the causal structure of the spacetime. is, however, still an open question how So how can this theory obtain any information from beyond the – What can we learn about the singularity and global properties in the bulk can be ob- horizons? In other words, about singularity theorems in asymptotically AdS tained from the correlation functions spacetimes? how is the global structure of the bulk spacetime, beyond the hori- of the boundary theory. – Can one obtain a complete classification of all the zons, encoded in the boundary correlators? wormhole spacetimes? – ...

Coordinate systems 3. Conclusions and outlook As a first result [4], we found a set of ‘physical’ coordinate systems that cover the entire manifold. This might The three-dimensional wormhole spacetimes are interesting objects help us to understand these spacetimes, since previously they were only studied as quotients of a part of AdS3. of study. The coordinate systems we found give a very direct description of the wormholes. They provide a useful handle for future Topologically, our coordinate patches are spacelike cylinders times time. The associated coordinates are research. denoted t, r, φ or τ, ρ, ϕ. The cylinders are maximally extended in the sense that their boundary circles cannot be pushed away further, since we are either on the conformal boundary or the patch would start overlapping In the future, we want some of the above questions to be answered. with itself. We should distinguish between ‘outer charts’, where one of the bounding circles lies at asymptotic Our line of attack is the following: infinity, and ‘inner charts’, where both circles lies at finite spacelike distance from any point in the cylinder. 1. We are interested in the behaviour of correlation functions of the boundary theory as a function of the moduli of the spacetime. We Inner charts therefore switch on other fields in the bulk and compute the corre- The inner charts have coordinate ranges: lation functions of their dual operators. 2. A complication arises because we are in Lorentzian signature and < t < −∞ ∞ hence we have an initial-value problem, in contrast with the Rie- 1 < r < 1 − mannian case in which the Dirichlet problem has a unique solution. φ φ + 2π This we should resolve. ∼ t = 0 In this coordinate system, the metric is: 3. We might be able to give initial data by Wick rotating the space- times via the substitution t = iτ. Afterwards, we glue Lorenztian 1 a2dr2 2a√M sin(χ)dφ dr and Riemannian metrics together along the slices t = τ = 0. Ensur- ds2 = dt2 + + M[(ar + b)2 + 1]dφ2 t cosh2(t) − (ar + b)2 + cos2(χ) − (ar + b)2 + cos2(χ) ing a smooth gluing gives us then an initial state for the Lorentzian   setting. p Note the appearance of the parameters a, b, χ; they parameterize in a rather straightforward way the lengths 4. This procedure requires the application of both hyperbolic geome- of closed noncontractable periodic spacelike geodesics in the spacetime and angles between them. try and Teichmüller theory, so a better understanding of these sub- Outer charts jects is also a prerequisite. For the outer charts the coordinate ranges are:

< τ < −∞ ∞ α < ρ < − ∞ ϕ ϕ + 2π ∼ ReferReferencesences We see that r extends all the way to infinity. The horizons lie entirely in τ = 0 [1] S. Aminneborg, I. Bengtsson, D. Brill, S. Holst, and P. Peldan. these charts and are given by ρ = √M sinh(√Mτ). The metric is: Class. Quant. Grav., 15:627–644, 1998, gr-qc/9707036. (ρ2 + M)( dτ 2 + dϕ2) dρ2 [2] D. Brill. 1998, gr-qc/9904083. ds2 = − + cosh2(√Mτ) ρ2 + M [3] Juan M. Maldacena. Adv. Theor. Math. Phys., 2:231–252, 1998, hep-th/9711200. The only parameter appearing in this chart is the mass of the black hole M. Hence, no matter what the topol- ogy of the spacelike slices is, outside of the horizon this goes unnoticed as far as the geometry is concerned. [4] B. van Rees and K. Skenderis. in preparation. Transition functions The transition functions are defined on the overlap betweent the charts. There are different types, depending on whether they are between inner or outer charts. We do not give them here. Annual report 2007 136 Appendix E National seminars

Condensed Matter Physics

Date: • 13 April 2007 Location: Oost Indisch Huis, Amsterdam, the Netherlands Scientific organisers: J.-S. Caux (UvA); K. Schoutens (UvA) Program: P. Calabrese (Pisa): Entanglement entropy in extended quantum systems M.S. Golden (UvA): Fermiology of bilayer colossal magnetoresistant manganites D.A. Tennant (Berlin): Spin correlations in quantum magnets U. Schollw¨ock (Aachen): Disentangling strongly correlated quantum systems Date: • 7 December 2007 Location: University Library, Utrecht University, the Netherlands Scientific organisers: R. Duine (UU); C. Morais Smith (UU); H. Stoof (UU) Program: R. Duine (UU): Spin pumping by domain walls A. de Visser (UvA): Superconductivity on the border of weak itinerant ferromag- netism in UCoGe A. Hemmerich (Hamburg): Optical lattice with a staggered magnetic field B. Nienhuis (UvA): Entanglement in a spin chain obtained from exact density matrices C. Pfleiderer (Munich): Quantum order of chiral magnets Annual report 2007 138

Theoretical High Energy Physics

Date: • 30 March 2007 Location: NIKHEF, Amsterdam, the Netherlands Scientific organisers: J. de Boer (UvA); J. Smit (UvA) Program: G. Arutyunov (UU): The S-matrix of AdS/CF T M. de Roo (RUG): D = 11 and E11 B. Sanders (RUG): Neutrinos as cluster dark matter J. Vermaseren (NIKHEF): The work of Willy van Neerven

Date: • 23 November 2007 Location: NIKHEF, Amsterdam, the Netherlands Scientific organisers: J. de Boer (UvA); J. Smit (UvA) Program: R. Britto (UvA): The simplicity of scattering amplitudes S. Carlip (Davis/Utrecht): Black hole entropy and the problem of universality G. ’t Hooft (Utrecht): Unitarity in the Brout-Englert-Higgs mechanism for grav- ity J. van der Bij (Freiburg): No Higgs at the LHC?! Appendix F Statistics

Statistics 2007 On 31 December 2007 seventy-three (73) PhD students were affiliated to the DRSTP. In 2007 fifteen (15) PhD students joined the DRSTP.

Twelve (12) PhD degrees were granted in 2007. The average duration of their PhD research (from start of contract to PhD exam date) was 49,5 months (48,0 in 2006).

Statistics 2002-2007

PhDs (AIO/OIO) granted 1 January 2002 - 31 December 2007

2002 2003 2004 2005 2006 2007 Total AIO + OIO

Theme 1 7 6 7 9 7 7 43

Theme 2 5 7 6 10 12 5 45

Total 12 13 13 19 19 12 88 Annual report 2007 140

PhD efficiency

In the period 1 January 2002 - 31 December 2007, 88 PhD degrees were granted. Of these students 75% obtained their PhD research within four years and six months. The full distribution is as follows: within 4 years: 23 (26%) within 4 years and 6 months: 43 (49%) within 5 years: 13 (15%) more than 5 years: 9 (10%)

The fraction of PhD degrees granted to women in the period 1 January 2002 - 31 December 2007 is 7%.

To monitor the PhD efficiency at a slightly longer time scale, we also present some data for the period 1 January 2000 - 31 December 2007. In this period 122 PhD students have started their research work. At the end of this period (31 December 2007) 58 of them have graduated and 3 of them have prematurely discontinued their contract. Of the remaining 61, 57 have started their PhD research after 1 January 2004. 141 Appendix F

Employment following the PhD

2002-2007 number % Postdoctoral positions in theoretical physics: the Netherlands 6 EU 34 USA 7 Abroad elsewhere 4 subtotal 51 58% Positions in academia and in public (research) institutions not related to theoretical physics: Postdoc philosophy RU 1 Research scientist education foundation abroad 1 PhD position mathematics (abroad) 1 EURANDOM, Eindhoven 1 Dutch Cancer Inst. 1 Leiden Univ. Medical Center 1 Utrecht Univ. Medical Center 1 subtotal 7 8% Positions in the government and in government related organizations: Ministry of Justice 1 Ministry of Public works 1 subtotal 2 2% Positions in commercial companies: Philips research 3 NXP semiconductors 1 ASML 1 Utility company 1 Banking 4 Actuary assistant 1 (Pension) insurance 2 Various software companies 6 Consultancy (Ernst&Young/McKinsey) 4 subtotal 23 26% Teaching positions: High school teacher 3 subtotal 3 3% Other: Military service 1 Unknown 1 subtotal 2 2% Total 88