DOCSLIB.ORG

CV Klavs Hansen April 2, 2020

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
CV Klavs Hansen April 2, 2020 CV Klavs Hansen April 2, 2020 Present position: Professor of Physics, Tianjin University, P.R. China email: [email protected] Website http://physics.gu.se/∼klavs/ Date and place of birth: August 3rd 1958, Odense, Denmark Citizenship: Danish. Research Research interests: Nanoscale particles in the gas phase; nanoparticles and large molecules, including fullerenes, metal and molecular clusters, and polycyclic aro- matic hydrocarbon (PAH) molecules. Main topics: Finite size effects of quantum and thermal phenomena. Tools: Electrostatic storage rings, mass spectrometers. Publications: 155 peer-reviewed; H-index = 37; citations 4000+ (Database: Web of Science); Monograph 'Statistical Physics of Nanoparticles in the Gas Phase' (2nd edition published 2018). Education and degrees Undergraduate studies in physics, chemistry and mathematics at the University of Copenhagen 9/1978 - 6/1983. Masters degree work 9/1983 - 11/1986 in theoretical high energy physics at the Niels Bohr Institute, Copenhagen, Denmark, supervised by Holger Bech Nielsen. Cand. Scient. degree (= Masters degree) 11/1986. Graduate studies at the Niels Bohr Institute, Roskilde, Denmark, from 10/1987. Thesis adviser Sven Bjørnholm. Collaboration with Physics Nobel laureate B. Mot- telson. Ph.D. degree 4/1991 with the project title 'An Experimental Study of Electronic Shell Structure in Large Sodium Clusters'. Docent degree1 5/2000 at the Physics Department, University of Jyv¨askyl¨a,Finland. Previous positions Postdoc, Department of Chemistry, University of California, Los Angeles, 8/1991- 8/1992, with R.L.Whetten group. 1Swedish and Finnish academic degree beyond Ph.D. degree Research Assistant Professor (non-tenure track), Niels Bohr Institute, University of Copenhagen, 8/1992-1/1995. Fellow under the EU-programme 'human capital and mobility' and Research Sci- entist at the Max Born Institute, Berlin, 2/1995-11/1997, w. E.Campbell. Collab- oration with Chemistry Nobel laureate H. Kroto. Research Associate Professor, Institute of Physics, University of Arhus,˚ 12/1997- 3/1999, w. J.U.Andersen. Research Associate Professor, Niels Bohr Institute-Ørsted Laboratory, University of Copenhagen, 4/1999. Research Scientist, Institute of Physics and Institute of Nuclear Chemistry, Jo- hannes Gutenberg University, Mainz, 5/1999-9/1999, w. L.Schweikhard. Senior Researcher, Department of Physics, University of Jyv¨askyl¨a,Jyv¨askyl¨a,Fin- land, 10/1999-1/2003, w. J.Pekola. Senior associate professor in atomic physics at Gothenburg University, Sweden, 2/2003-5/2016. Honors and awards Guest professor at Faculty of Science, Tokyo Metropolitan University, October, 2011 - March 2012. Guest professor at Universit´eParis Sud, July 2014. Guest professor at Department of Physics, Arhus˚ University, August 2014-June 2015. 1000 Talents professorship of the City of Tianjin, with a personal prize of 1 million yuan, October 2016. Senior guest professor at KU Leuven, November 21, 2016 - September 30, 2022. Academic leadership Board member of the Chemical and Molecular Physics section of the European Physical Society, 2004-2007. Chair of the Chemical and Molecular Physics section of the European Physical Society, 2007-2010, 2010-2013. Leader of the Gothenburg 'Nanoparticles in Interactive Environments' platform, 2007-2010. Board member of NanoConnect Scandinavia, 2009-2012. International program committee member of ECAMP10, Salamanca, Spain, 2010. International program committee member of ECAMP11, Aarhus, Denmark, 2013. International program committee of the Electrostatic Storage Devices conference series, from 2015. International committee member of EGAS (European Group of Atomic Systems) 2016-2022. Funding and positions review: Reviewer of proposals for CNRS (France); US-Israel Binational Science Foundation; Israel Science Foundation; External expert, associate professorship position at the Department of Physics, Uni- versity of Helsinki; Icelandic Research Fund; External expert, position at the Department of Physics, University of Helsinki; Post-docs positions, Irish Research Council; Academic Research Excellence Award of Chinese Ministry of Education. Editorial work Editor of special issue of International Journal of Mass Spectrometry, vol.252 (2006). Editor of the ISSPIC13 proceedings issue of Eur. Phys. J. D, vol.43(1-3) (2007). Member of the editorial board of the atomic and molecular physics section of The Scientific World Journal (2012-2017). Member of the editorial board of the International Journal of Chemical Physics (2013-2015). Member of the editorial board of the International Journal of Mass Spectrometry (September 2016-present). Editorial Advisory Board Member for Cambridge Scholars Publishing, UK (June 2018-present). International conferences, summer schools and workshop organization 'Telluride Research Center Cluster Workshop 1993'. Co-organizer with D.Wales, Cambridge. Conference secretary, ISSPIC13 (Gothenburg, July 2006). Organized 1st Nanoparticle and STINT Summer School, August 20-31, 2007. Organized (w. P.Andersson) workshop 'Nucleation of inorganic atmospheric clusters and particles', Gothenburg, Sweden, August 13-15, 2008. Co-director of the 50th Solid State Ettore Majorana Summer school 'Shell structure in finite quantum systems' (w. V. Kresin, University of Southern California), Erice, Sicily, Italy, July 2010. Organizer of 'Summer School on Storage Devices and Ion Traps', Gothenburg, June 2011. Organizer of the 2013 NICITA workshop on ions in the atmosphere, Gothenburg, March 2013. Co-organizer of Nordic Cluster Summer School, Gothenburg, June 2014 (w. H. Gr¨onbeck). Member of the international program committee of the conference series Electro- static Storage Devices, June 2015-present. Co-director of 'Delocalized electrons in atomic and molecular nanoclusters', Sicily, July 2016, International School of Solid State Physics (71st Workshop) at the Ettore Majorana Foundation and Centre for Scientific Culture (w. V.V. Kresin, University of Southern California). 'Photophysics of biomolecules' Telluride workshop, Telluride, July 2017 (w. S.B. Nielsen, Aarhus, Denmark; J.M. Weber, JILA, Colorado, USA; P. Barran, Manch- ester, UK). Chair, ESD8 conference on electrostatic storage devices, Tianjin 2019. 'Dynamics of Nanoclusters with Delocalized Electrons', Sicily, October 2021, In- ternational School of Solid State Physics (77st Workshop) at the Ettore Majorana Foundation and Centre for Scientific Culture (w. V.V. Kresin, University of South- ern California). Excerpts of pedagogical portfolio Ph.D. theses supervision: J.Toppari, M.T.Savolainen, L.Taskinen (shared w. J.Pekola, University of Jyv¨askyl¨a); M. Kjellberg, E. Sund´en(Gothenburg University) (all completed), Samia Arain, Za- heer Iqbal (Tianjin University, ongoing). Masters theses supervision: Eight completed. Lecturing Topics: Solid state physics; quantum effects in finite systems; statistical physics of nanoparticles; atomic and molecular physics; atomic, molecular and cluster physics; advanced classical mechanics; solid state physics Universities: Gothenburg, Chalmers, Jyv¨askyl¨a,Tianjin. Degree opponent and committees External evaluator for the docent degree of Aldana Rosso (Lund University, De- cember 2016). Opponent for Ph.D. thesis of Tinja Olenius (Department of Physics, University of Helsinki, March 2015) Opponent for Licentiate thesis2, Magnus Borgh (LTH, Lund, December 2004); op- ponent for Licentiate thesis, Anders B¨orjesson(Gothenburg, January 2009). Membership of Ph.D. committees: 10 Swedish, 1 Japanese, 1 French, 1 Belgian. Invited/selected talks 116 oral presentations from 1990 to March 2020, including invited and selected conference talks, talks at workshop and out-of-house departmental seminars. 2Swedish thesis equivalent to half Ph.D degree.
Load more

Recommended publications
  • Chaos, Scaling and Existence of a Continuum Limit in Classical Non-Abelian Lattice Gauge Theory
    LA-UR- 9 6 " 4 43"6" Los Alamos National Laboratory is operated by the University of Caiifomia for the United States Department of Energy under contract W-7405-ENG-36 TITLE: CHAOS, SCALING AND EXISTENCE OF A CONTINUUM Q&TJ LIMIT IN CLASSICAL NON-ABELIAN LATTICE GAUGE THEORY AUTHOR(S): Holger Nielsen, Niels Bohr Institute Hans Rugh, Universty of Warwick Svend Rugh, T-6 SUBMITTED TO: 28TH INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS, WARSAW POLAND, JULY 1996 By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes. The Los Alamos National Laboratory requests that the publisher identify this article as work performed under the auspices of the U.S. Department of Energy. Los Alamos National Laboratory L< Los Alamos, New Mexico 87545 FORM NO. 836 R4 ST. NO. 2629 5/81 DISTRIBUTION OF THIS DOCUMENT IS UNLIMITED DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or use- fulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights.
    [Show full text]
  • Pos(CORFU2019)049 ∗ -Ray Excess
    Several degenerate vacua and a model for Dark Matter in the pure Standard Model PoS(CORFU2019)049 Holger Bech Nielsen∗ Niels Bohr Institute, Blegdamsvej 15 -21, Copenhagen E-mail: [email protected] Colin D. Froggatt Glasgow University E-mail: [email protected] We return to a model of ours for what the dark matter can be with the property that it is compatible with the Standard Model alone. The only genuine new physics is a principle imposing restrictions on the parameters/couplings in the Standard Model. They are required to lead to several vacua being degenerate in energy density with each other. We especially look for some of the signals from the dark matter, which are not just gravitational: The 3.55 keV X-ray radiation, the positron excess and further g-ray excess. The picture of ours for dark matter has it being cm-size pearls of 100000 ton mass in order of magnitude. Corfu Summer Institute 2019 "School and Workshops on Elementary Particle Physics and Gravity" (CORFU2019) 31 August - 25 September 2019 Corfu, Greece ∗Speaker. ⃝c Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). http://pos.sissa.it/ Dark matter, pure S.M. Holger Bech Nielsen 1. Introduction Several degenerate vacua and a model for Dark Matter in the pure Standard Model We believe in the pure Standard Model further up in energy than most physicists, except for see-saw neutrinos and the baryon number excess for which we accept the need for new physics: • No new fundamental particles, except see-saw neutrinos and possibly particles almost at the Planck scale; but we shall not talk about such high energies today.
    [Show full text]
  • Classical String Theory
    PROSEMINAR IN THEORETICAL PHYSICS Classical String Theory ETH ZÜRICH APRIL 28, 2013 written by: DAVID REUTTER Tutor: DR.KEWANG JIN Abstract The following report is based on my talk about classical string theory given at April 15, 2013 in the course of the proseminar ’conformal field theory and string theory’. In this report a short historical and theoretical introduction to string theory is given. This is fol- lowed by a discussion of the point particle action, leading to the postulation of the Nambu-Goto and Polyakov action for the classical bosonic string. The equations of motion from these actions are derived, simplified and generally solved. Subsequently the Virasoro modes appearing in the solution are discussed and their algebra under the Poisson bracket is examined. 1 Contents 1 Introduction 3 2 The Relativistic String4 2.1 The Action of a Classical Point Particle..........................4 2.2 The General p-Brane Action................................6 2.3 The Nambu Goto Action..................................7 2.4 The Polyakov Action....................................9 2.5 Symmetries of the Action.................................. 11 3 Wave Equation and Solutions 13 3.1 Conformal Gauge...................................... 13 3.2 Equations of Motion and Boundary Terms......................... 14 3.3 Light Cone Coordinates................................... 15 3.4 General Solution and Oscillator Expansion......................... 16 3.5 The Virasoro Constraints.................................. 19 3.6 The Witt Algebra in Classical String Theory........................ 22 2 1 Introduction In 1969 the physicists Yoichiro Nambu, Holger Bech Nielsen and Leonard Susskind proposed a model for the strong interaction between quarks, in which the quarks were connected by one-dimensional strings holding them together. However, this model - known as string theory - did not really succeded in de- scribing the interaction.
    [Show full text]
  • Pos(CORFU2016)050
    F(750), We Miss You as a Bound State of 6 Top and 6 Antitop Quarks, Multiple Point Principle PoS(CORFU2016)050 Holger F. Bech Nielsen∗ y Niels Bohr Institute, Blegdamvej 15-21, DK 2100 Copenhagen Ø, Denmark D.L. Bennett Brooks Institute, Copenhagen, Denmark C.R. Das z BLTP, JINR, Dubna, Moscow, Russia C.D. Froggatt § Glasgow University, Glasgow, UK L.V. Laperashvili { ITEP, National Research Center “Kurchatov Institute”, Moscow, Russia We review our speculation, that in the pure Standard Model the exchange of Higgses, including also the ones “eaten by W ± and Z”, and of gluons together make a bound state of 6 top plus 6 anti top quarks bind so strongly that its mass gets down to about 1/3 of the mass of the collective mass 12 mt of the 12 constituent quarks. The true importance of this speculated bound state is that it makes it possible to uphold, even inside the Standard Mode, our proposal for what is really a new law of nature saying that there are several phases of empty space, vacua, all having very small energy densities (of the order of the present energy density in the universe). The reason suggested for believing in this new law called the “Multiple (Criticality) Point Principle” is, that estimating the mass of the speculated bound state using the “Multiple Point Principle” leads to two consistent mass-values; and they even agree with a crude bag-model like estimate of the mass of this bound state. Very unfortunately the statistical fluctuation so popular last year when interpreted as the digamma resonance F(750) turned out not to be a real resonance, because our estimated bound state mass is just around the mass of 750 GeV.
    [Show full text]
  • “Objects”, and Attempt Generalization to P-Adic Theory
    Instructive Review of Novel SFT with Non-interacting consituents “objects”, and attempt Generalization to p-adic theory Holger Bech Nielsen∗ Niels Bohr Institute, Copenhagen University E-mail: [email protected] Masao Ninomiya Yukawa Institute for Theoretical Physics , Kyoto University, Kyoto 606-0105, Japan and Yuji Sugawara Lab., Science and Engineering , Department of Physics Sciences, Ritsumeikan university E-mail: [email protected] We have constructed a new formalism for describing a situation with several (dual) strings present at a time, a string field theory, by means of a constituent / a strings from objects picture similar to, but importantly different from the “bits” by Charles Thorn[1]. Our "objects" (essentially the bits) represent rather a making a lattice in the light cone variables on the string. The remarkable feature and simplicity of our formalism is, that the "objects" do NOT interact, basically just run or sit trivially fixed. Scattering is a fake in our formalism. This opens also up for hoping for generalizations inspired by hadrons with their partons all having Bjorken variable x = 0, and thus infinitely many constituents. The p-adic string is an example. Corfu Summer Institute 2019 "School and Workshops on Elementary Particle Physics and Gravity" (CORFU2019) 31 August - 25 September 2019 Corfu, Greece ∗Speaker. c Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). https://pos.sissa.it/ Generalizing Novel SFT Holger Bech Nielsen 1. Introduction We have worked since long on a formalism for a string field theory with the possibility of de- scribing an arbitrary number of strings, in other words a string field theory, which we called a Novel SFT.[3] Our “Novel SFT” has same spirit as the before ours developped string from bits reformu- lation of string theory by Charles Thorn [1].
    [Show full text]
  • What Comes Beyond the Standard Models Bled, July 11–19, 2016
    i i “proc16” — 2016/12/12 — 10:17 — page I — #1 i i BLEJSKE DELAVNICE IZ FIZIKE LETNIK 17, STˇ . 2 BLED WORKSHOPS IN PHYSICS VOL. 17, NO. 2 ISSN 1580-4992 Proceedings to the 19th Workshop What Comes Beyond the Standard Models Bled, July 11–19, 2016 Edited by Norma Susana MankoˇcBorˇstnik Holger Bech Nielsen Dragan Lukman DMFA – ZALOZNIˇ STVOˇ LJUBLJANA, DECEMBER 2016 i i i i i i “proc16” — 2016/12/12 — 10:17 — page II — #2 i i The 19th Workshop What Comes Beyond the Standard Models, 11.– 19. July 2016, Bled was organized by Society of Mathematicians, Physicists and Astronomers of Slovenia and sponsored by Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana Society of Mathematicians, Physicists and Astronomers of Slovenia Beyond Semiconductor (MatjaˇzBreskvar) Scientific Committee John Ellis, CERN Roman Jackiw, MIT Masao Ninomiya, Okayama Institute for Quantum Physics Organizing Committee Norma Susana MankoˇcBorˇstnik Holger Bech Nielsen Maxim Yu. Khlopov The Members of the Organizing Committee of the International Workshop “What Comes Beyond the Standard Models”, Bled, Slovenia, state that the articles published in the Proceedings to the 19th Workshop “What Comes Beyond the Standard Models”, Bled, Slovenia are refereed at the Workshop in intense in-depth discussions. i i i i i i “proc16” — 2016/12/12 — 10:17 — page III — #3 i i Workshops organized at Bled . What Comes Beyond the Standard Models (June 29–July 9, 1998), Vol. 0 (1999) No. 1 (July 22–31, 1999) (July 17–31, 2000) (July 16–28, 2001), Vol. 2 (2001) No. 2 (July 14–25, 2002), Vol.
    [Show full text]
  • A Symmetries of the QCD Phase Transition Using Chiral Lattice Fermions
    The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions Zhongjie Lin Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences COLUMBIA UNIVERSITY 2014 ©2014 Zhongjie Lin All Rights Reserved Abstract The Chiral and U(1)A Symmetries of the QCD Phase Transition using Chiral Lattice Fermions Zhongjie Lin With regard to the nature of the finite-temperature QCD phase transition and the fate of the chiral and anomalous axial symmetries associated with it, we present in this thesis two parallel sets of investigations into the QCD phase transition region between 139 and 195 MeV. Both studies adopt the Iwasaki gauge action augmented with the dislocation suppression determinant ratio with 2+1 flavors of chiral fermions. This choice of lattice action accurately reproduces the SU(2)L × SU(2)R and U(1)A symmtries of the continuum. The first study simulates QCD thermodynamics on a line of constant physics that rep- resents 200 MeV pions and physical kaons using domain wall fermions (DWF) at three space-time volumes: 163 × 8, 243 × 8, and 323 × 8, where the largest volume varies in linear size between 5.6 fm (at T = 139 MeV) and 4.0 fm (at T = 195 MeV). The chiral condensates, connected and disconnected susceptibilities and the Dirac eigenvalue spectrum are reported and compared between different volumes as well as with the staggered results. We find a pseudo-critical temperature, Tc, of approximately 165 MeV and strong finite volume depen- dence below Tc.
    [Show full text]
  • What Comes Beyond the Standard Models, 19.– 29
    BLEJSKE DELAVNICE IZ FIZIKE LETNIK 6, STˇ .2 BLED WORKSHOPS IN PHYSICS VOL.6,NO. 2 ISSN 1580–4992 Proceedings to the 8th Workshop What Comes Beyond the Standard Models Bled, July 19–29, 2005 Edited by Norma MankoˇcBorˇstnik Holger Bech Nielsen Colin D. Froggatt Dragan Lukman arXiv:hep-ph/0512061v1 5 Dec 2005 DMFA – ZALOZNIˇ STVOˇ LJUBLJANA, DECEMBER 2005 The 8th Workshop What Comes Beyond the Standard Models, 19.– 29. July 2005, Bled was organized by Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana and sponsored by Slovenian Research Agency Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana Society of Mathematicians, Physicists and Astronomers of Slovenia Organizing Committee Norma MankoˇcBorˇstnik Colin D. Froggatt Holger Bech Nielsen Contents Preface ................................................... .......... V 1 Can MPP Together with Weinberg-Salam Higgs Provide Cosmological Inflation? D.L. Bennett and H.B. Nielsen ......................................... 1 2 Conserved Charges in 3d Gravity With Torsion M. Blagojevi´cand B. Cvetkovi´c ........................................ 8 3 Mass Matrices of Quarks and Leptons in the Approach Unifying Spins and Charges A. Borˇstnik Braˇciˇcand S.N. MankoˇcBorˇstnik ............................ 17 4 Dark Matter From Encapsulated Atoms C.D. Froggatt and H.B. Nielsen ........................................ 32 5 Dirac Sea for Bosons Also and SUSY for Single Particles Y. Habara, H.B. Nielsen and M. Ninomiya .............................. 40 6 Searching for Boundary Conditions in Kaluza-Klein-likeTheories D. Lukman, N. S. MankoˇcBorˇstnik and H. B. Nielsen ..................... 56 7 Second Quantization of Spinors and Clifford Algebra Objects N.S. MankoˇcBorˇstnik and H. B. Nielsen ................................ 63 8 Are there Interesting Problems That Could Increase Understanding of Physics and Mathematics? R.
    [Show full text]
  • Predicted the Higgs Mass
    PREdicted the Higgs Mass H.B. Nielsen ∗ The Niels Bohr Institute, Copenhagen, Denmark This article is one of the contributions of Holger Bech Nielsen to the conference of “What Comes Beyond the Standard Models” in Bled 2012. Abstract We like to investigate the idea of taking as non-accidental a remarkably good agreement of our (C.D. Froggatt and myself, and also with Yasutaka Takanishi[4]) prediction[1] of the Higgs mass. Our modernized most simple “multiple point prin- ciple” prediction 129:4 ± 2 GeV[7] versus the recently[2][3] observed 126 ± 1 GeV agrees well. The PREdicted Higgs mass is essentially the smallest value, that would not make our present vacuum unstable. There are two slightly different versions in as far as we can either use absolute stability by the alternative vacuum being required to have higher energy density than the present one or just metastability requiring that our vacuum should not have decayed in the early time just after big bang (or later if that should be easier). This is of course provided we suppose that the Standard Model would function almost all the way up to the scale relevant for the alternative vacuum (which as we shall see is close to the Planck energy scale for the Higgs field expectation value). This is very close to the suggestion of Akhani-Hamed et al., which though rather than the past stability discuss the future[6]. Also Shaposhnikov et al have predicted the Higgs mass. If this coincidence shows up with higher accuracy, so that we indeed had to take it as not being just an accident, we would have to conclude that there should in fact not be any disturbing “new physics” all the way up of such a strength, that it could disturb the coincidence.
    [Show full text]
  • What Comes Beyond the Standard Models Bled, July 9–17, 2017
    i i “proc17” — 2017/12/11 — 19:44 — page I — #1 i i BLEJSKE DELAVNICE IZ FIZIKE LETNIK 18, STˇ . 2 BLED WORKSHOPS IN PHYSICS VOL. 18, NO. 2 ISSN 1580-4992 Proceedings to the 20th Workshop What Comes Beyond the Standard Models Bled, July 9–17, 2017 Edited by Norma Susana MankoˇcBorˇstnik Holger Bech Nielsen Dragan Lukman DMFA – ZALOZNIˇ STVOˇ LJUBLJANA, DECEMBER 2017 i i i i i i “proc17” — 2017/12/11 — 19:44 — page II — #2 i i The 20th Workshop What Comes Beyond the Standard Models, 9.– 17. July 2017, Bled was organized by Society of Mathematicians, Physicists and Astronomers of Slovenia and sponsored by Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana Society of Mathematicians, Physicists and Astronomers of Slovenia Beyond Semiconductor (MatjaˇzBreskvar) Scientific Committee John Ellis, CERN Roman Jackiw, MIT Masao Ninomiya, Yukawa Institute for Theoretical Physics, Kyoto University and Mathematical Institute, Osaka-city University Organizing Committee Norma Susana MankoˇcBorˇstnik Holger Bech Nielsen Maxim Yu. Khlopov The Members of the Organizing Committee of the International Workshop “What Comes Beyond the Standard Models”, Bled, Slovenia, state that the articles published in the Proceedings to the 20th Workshop “What Comes Beyond the Standard Models”, Bled, Slovenia are refereed at the Workshop in intense in-depth discussions. i i i i i i “proc17” — 2017/12/11 — 19:44 — page III — #3 i i Workshops organized at Bled . What Comes Beyond the Standard Models (June 29–July 9, 1998), Vol. 0 (1999) No. 1 (July 22–31, 1999) (July 17–31, 2000) (July 16–28, 2001), Vol.
    [Show full text]
  • Neutrino Mass Matrix Suppression by Abelian Charges with See-Saw Mechanism
    CERN-TH/2000-119 NBI-HE-00-18 hep-ph/0004137 Neutrino mass matrix suppression by Abelian charges with see-saw mechanism H. B. Nielsena;b;‡ and Y. Takanishib;§ aTheory Division, CERN, CH-1211 Geneva 23, Switzerland bThe Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark Abstract We have investigated a neutrino mass matrix model without supersymmetry including three see-saw right-handed neutrinos around order 1012 GeV masses, aiming at a picture with all small numbers explained as being due to approximately conserved gauge charges. 2 +3 −2 The prediction of the solar neutrino mixing angle is given by sin 2θ =3−2 × 10 ;in fact, the solar mixing angle is, apart from detailed order unity corrections, equal to the Cabibbo angle. Furthermore the ratio of the solar neutrino mass square difference to that +11 −4 for the atmospheric neutrino oscillation is predicted to 6 −4 ×10 and is given by the same Cabibbo angle related parameter ξ as 6 ξ4. April 2000 ‡E-mail: [email protected]; [email protected] §E-mail: [email protected] 1 Introduction 1.1 Neutrino data According to several experiments [1, 2, 3, 4, 5] it now seems that neutrino oscillations have to be taken seriously, and in all likelihood we should interpret such neutrino oscillations as being due to neutrino masses. We consider it relatively hopeless to incorporate the neutrino oscillations observed by LSDN [6] which are partly excluded by Karmen 2 [7], especially insofar as in the present article we adopt the philosophy that only particles which are mass protected by the Standard Model (SM) gauge symmetries are sufficiently light to be observed at present.
    [Show full text]
  • Emergent Gauge Bosons∗ Abstract
    SLAC–PUB–9063 November 2001 Emergent Gauge Bosons¤ James Bjorken Stanford Linear Accelerator Center Menlo Park, CA 94025 [email protected] Abstract The old idea that the photon is a Goldstone boson emergent from a spontaneously broken theory of interacting fermions is revisited. It is conjectured that the gauge- potential condensate has a vacuum expectation value which is very large, perhaps the GUT/Planck momentum scale, but that the magnitude of the effective potential which generates it is very small, so small that in the limit of vanishing cosmological constant it would vanish. In this way, the threat of unacceptably large observable, noncovariant residual effects is mitigated. The linkage of these ideas to other spec- ulative ideas involving black holes and parametrizations of Standard-Model coupling constants is also described. Contributed to the 4th Workshop “What Comes beyond the Standard Model?” Bled, Slovenia July 17–27, 2001 ¤Work supported by Department of Energy contract DE–AC03–76SF00515. 1 Introduction It is a pleasure to write this note on the occasion of Holger Bech Nielsen’s 60th birthday celebration. It will deal with very speculative matters, most of which down through the years have benefitted by interactions with him. Holger Bech is one of few with whom I find it fruitful to even discuss such things. Not only has he been always receptive, but most importantly he has reacted thoughtfully and critically, instead of the commonplace reaction of indifference. The subject matter discussed below is actually of common interest: whether gauge bosons such as the photon may be regarded as emergent degrees of freedom.
    [Show full text]