Thesis in Amsterdam
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Particles-Versus-Strings.Pdf
Particles vs. strings http://insti.physics.sunysb.edu/~siegel/vs.html In light of the huge amount of propaganda and confusion regarding string theory, it might be useful to consider the relative merits of the descriptions of the fundamental constituents of matter as particles or strings. (More-skeptical reviews can be found in my physics parodies.A more technical analysis can be found at "Warren Siegel's research".) Predictability The main problem in high energy theoretical physics today is predictions, especially for quantum gravity and confinement. An important part of predictability is calculability. There are various levels of calculations possible: 1. Existence: proofs of theorems, answers to yes/no questions 2. Qualitative: "hand-waving" results, answers to multiple choice questions 3. Order of magnitude: dimensional analysis arguments, 10? (but beware hidden numbers, like powers of 4π) 4. Constants: generally low-energy results, like ground-state energies 5. Functions: complete results, like scattering probabilities in terms of energy and angle Any but the last level eventually leads to rejection of the theory, although previous levels are acceptable at early stages, as long as progress is encouraging. It is easy to write down the most general theory consistent with special (and for gravity, general) relativity, quantum mechanics, and field theory, but it is too general: The spectrum of particles must be specified, and more coupling constants and varieties of interaction become available as energy increases. The solutions to this problem go by various names -- "unification", "renormalizability", "finiteness", "universality", etc. -- but they are all just different ways to realize the same goal of predictability. -
Prospects from Strings and Branes
Prospects from strings and branes Alexander Sevrin Vrije Universiteit Brussel and The International Solvay Institutes for Physics and Chemistry http://tena4.vub.ac.be/ Moriond 2004 Strings and branes… Moriond, March 24, 2004 1 References Not-too-technical review paper, including numerous references: Strings, Gravity and Particle Physics by Augusto Sagnotti and AS In the proceedings of 37th Rencontres de Moriond on Electroweak Interactions and Unified Theories, 2002. e-Print Archive: hep-ex/0209011 Strings and branes… Moriond, March 24, 2004 2 Contents • Dirichlet-branes • D-branes and gauge theories - Worldvolume point of view -AdS/CFT • D-branes and black holes •Cosmology • Some conclusions Strings and branes… Moriond, March 24, 2004 3 Branes Solitons: solutions of the equations of motion with a finite energy(-density) and a mass inversely proportional to the coupling constant. E.g. Scalar field in d = 1 + 1: kink. 12m3 mass = λ Other example in d = 3 + 1: magnetic monopole: 1 mass ∝ 2 gYM Strings and branes… Moriond, March 24, 2004 4 Solitons in string theory: Dirichlet branes Besides the “conventional” fields, such as e.g., gµν (x)=gνµ(x): metric = graviton Φ(x): dilaton, one has RR- potentials as well. E.g. vector potential, A µ : Fµν = ∂µAν − ∂ν Aµ, Aµ → Aµ − ∂µf, Fµν → Fµν . Couples to particles: µ S = q dτ x˙ (τ)Aµ(x(τ)). Z Strings and branes… Moriond, March 24, 2004 5 E.g. 2-form potential, A µ ν = − A ν µ : Fµνρ = ∂µAνρ + ∂ν Aρµ + ∂ρAµν , Aµν → Aµν − ∂µfν + ∂ν fµ,Fµνρ → Fµνρ. Couples to strings: µ ν S = q dτdσ x˙(τ, σ) x0(τ, σ) Aµν (x(τ, σ)). -
Generalizing Entropic Force Formalism
Yongpyung 2012, Greenpia Condo, Feb. 21st 2012 GENERALIZING ENTROPIC FORCE FORMALISM Jin-Ho Cho (Hanyang University) w/ Hosin Gong, Hyosung Kim (POSTECH) Motivation (for the entropic force) Quantum Gravity .....not successful so far the role of gravity in AdS/CFT tree level supergravity (closed string) / quantum SYM (open string) Fundamental or Emergent? Entropic Force rubber band tends to increase the entropy S : larger S : smaller [Halliday et al., Fundamentals of Physics] Verlinde’s Idea [Erik Verlinde, 1001.0785] entropic force : F x = T S 4 4 3 holographic principle : Ac /G~ = N E = NkBT/2 T = ~a/2πkBc entropy change : S =2πkB( x mc/~) 4 4 (for a screen shift x ) 4 Newtonian Physics Newton’s law : (a planar screen) T = ~a/2πckB S =2πkB( x mc/~) 4 4 F x = T S 4 4 ~a 2πkBmc x = 4 2πk c ✓ B ◆✓ ~ ◆ = ma x 4 3 Gravitational force : (a spherical screen) N = Ac /G~ 2 Mc = E = NkBT/2 1 Ac3 ~a r2c2 = = a 2 G 2πc ✓ ~ ◆✓ ◆ G Q1: Cosmological Constant ? g R ab R + ⇤g =8⇡GT ab − 2 ab ab 3 Ac /G~ = N F x = T S S =2πkB( x mc/~) 4 4 E = NkBT/2 4 4 T = ~a/2πkBc ‘Volume Energy’ NkBT E = Mc2 +↵V = 2 N~ a ~a = T = 4⇡c 2⇡ckB 2 Ac a 3 = N = Ac /G~ 4⇡G 4⇡GM 4⇡G↵V a = + A Ac2 Determination of ↵ spherically symmetric case GM 4⇡G↵r a = + = Φ r2 3c2 r GM c2⇤r = Newtonian limit of Einstein eq. r2 − 3 c4 ↵ = ⇤ −4⇡G Einstein equation 4 c NkBT E = Mc2 ⇤V = − 4⇡G 2 c4 k c3 Mc2 ⇤ dV = B TdN = adA − 4⇡G 2 4⇡G Z Z Z 1 a b 1 a b 2 T Tg n ⇠ dV ⇤gabn ⇠ dV ab − 2 ab −4⇡G Z⌃ ✓ ◆ Z⌃ 1 = R na⇠b dV 4⇡G ab Z⌃ Q2: Entropic Coulomb Force ? [JHC & Hyosung Kim, 2012 J. -
Curriculum Vitae
SEBASTIAN DE HARO Curriculum Vitae Assistant Professor in Philosophy of Science at the Institute for Logic, Language and Computation and the Institute of Physics of the University of Amsterdam 1. RESEARCH PROFILE Areas of specialisation: Philosophy of Science, History and Philosophy of Physics, Theoretical Physics Areas of competence: Epistemology, Metaphysics, Ethics, Philosophical and Social Aspects of Information, History of Science, History of Philosophy, Philosophy of Logic and Language, Philosophy of Mathematics 2. PREVIOUS POSITIONS • Lecturer (2009-2020), Amsterdam University College (AUC), University of Amsterdam. Tasks: teaching, curriculum development and evaluation, thesis supervision, member of the BSA committee. Between 2009-2015 I also had tutoring responsibilities. • Lecturer (2019-2020, fixed term), Department of Philosophy, Free University Amsterdam • Lecturer in theoretical physics (fixed term), Institute for Theoretical Physics, Faculty of Science, University of Amsterdam. Teaching, research, thesis supervision. 02/12 - 07/14. • Research associate. Managing editor of Foundations of Physics on behalf of Gerard ’t Hooft, Spinoza Institute/ITP, Utrecht University and Springer Verlag, 2008-2009. Research, managing editorial office, setting up new projects, contact Editorial Board. 3. PUBLICATIONS Total number of citations (all publications): 2,751. i10-index: 33. h-index: 22 Full list of publications and citation information via Google scholar profile: http://scholar.google.nl/citations?user=rmXDqN4AAAAJ&hl=nl&oi=ao Journal articles, book chapters, and book reviews General philosophy of science: journal articles (6) 1. ‘The Empirical Under-determination Argument Against Scientific Realism for Dual Theories’. Erkenntnis, 2021. https://link.springer.com/article/10.1007%2Fs10670-020-00342-0 2. ‘Science and Philosophy: A Love-Hate Relationship’. -
Supersymmetry at Large Distance Scales
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server PUPT-1925 Supersymmetry at Large Distance Scales Herman Verlinde Physics Department, Princeton University, Princeton, NJ 08544 Abstract We propose that the UV/IR relation that underlies the AdS/CFT duality may provide a natural mechanism by which high energy supersymmetry can have large distance conse- quences. We motivate this idea via (a string realization of) the Randall-Sundrum scenario, in which the observable matter is localized on a matter brane separate from the Planck brane. As suggested via the holographic interpretation of this scenario, we argue that the local dynamics of the Planck brane – which determines the large scale 4-d geometry – is protected by the high energy supersymmetry of the dual 4-d theory. With this assumption, we show that the total vacuum energy naturally cancels in the effective 4-d Einstein equa- tion. This cancellation is robust against changes in the low energy dynamics on the matter brane, which gets stabilized via the holographic RG without any additional fine-tuning. 1. Introduction The observed smallness of the cosmological constant requires a remarkable cancellation of all vacuum energy contributions [1]. Supersymmetry seems at present the only known symmetry that could naturally explain this cancellation, but thus far no mechanism for supersymmetry breaking is known that would not destroy this property. Nonetheless, in searching for a possible resolution of the cosmological constant problem, it seems natural to include supersymmetry as a central ingredient. What would then be needed, however, is a mechanism – some UV/IR correspondence – by which the short distance cancellations of supersymmetry can somehow be translated into a long distance stability of the cosmological evolution equations. -
A Unitary S-Matrix for 2D Black Hole Formation and Evaporation
PUPT-1380 IASSNS-HEP-93/8 February 1993 A Unitary S-matrix for 2D Black Hole Formation and Evaporation Erik Verlinde School of Natural Sciences Institute for Advanced Study Princeton, NJ 08540 and Herman Verlinde Joseph Henry Laboratories Princeton University Princeton, NJ 08544 arXiv:hep-th/9302022v1 7 Feb 1993 Abstract We study the black hole information paradox in the context of a two-dimensional toy model given by dilaton gravity coupled to N massless scalar fields. After making the model well-defined by imposing reflecting boundary conditions at a critical value of the dilaton field, we quantize the theory and derive the quantum S-matrix for the case that N=24. This S-matrix is unitary by construction, and we further argue that in the semiclassical regime it describes the formation and subsequent Hawking evaporation of two-dimensional black holes. Finally, we note an interesting correspondence between the dilaton gravity S-matrix and that of the c = 1 matrix model. 1. Introduction The discovery that black holes can evaporate by emitting thermal radiation has led to a longstanding controversy about whether or not quantum coherence can be maintained in this process. Hawking’s original calculation [1] suggests that an initial state, describing matter collapsing into a black hole, will eventually evolve into a mixed state describing the thermal radiation emitted by the black hole. The quantum physics of black holes thus seems inherently unpredictable. However, this is clearly an unsatisfactory conclusion, and several attempts have been made to find a description of black hole evaporation in accordance with the rules of quantum mechanics [2, 3], but so far all these attempts have run into serious difficulties. -
The Birth of String Theory
The Birth of String Theory Edited by Andrea Cappelli INFN, Florence Elena Castellani Department of Philosophy, University of Florence Filippo Colomo INFN, Florence Paolo Di Vecchia The Niels Bohr Institute, Copenhagen and Nordita, Stockholm Contents Contributors page vii Preface xi Contents of Editors' Chapters xiv Abbreviations and acronyms xviii Photographs of contributors xxi Part I Overview 1 1 Introduction and synopsis 3 2 Rise and fall of the hadronic string Gabriele Veneziano 19 3 Gravity, unification, and the superstring John H. Schwarz 41 4 Early string theory as a challenging case study for philo- sophers Elena Castellani 71 EARLY STRING THEORY 91 Part II The prehistory: the analytic S-matrix 93 5 Introduction to Part II 95 6 Particle theory in the Sixties: from current algebra to the Veneziano amplitude Marco Ademollo 115 7 The path to the Veneziano model Hector R. Rubinstein 134 iii iv Contents 8 Two-component duality and strings Peter G.O. Freund 141 9 Note on the prehistory of string theory Murray Gell-Mann 148 Part III The Dual Resonance Model 151 10 Introduction to Part III 153 11 From the S-matrix to string theory Paolo Di Vecchia 178 12 Reminiscence on the birth of string theory Joel A. Shapiro 204 13 Personal recollections Daniele Amati 219 14 Early string theory at Fermilab and Rutgers Louis Clavelli 221 15 Dual amplitudes in higher dimensions: a personal view Claud Lovelace 227 16 Personal recollections on dual models Renato Musto 232 17 Remembering the `supergroup' collaboration Francesco Nicodemi 239 18 The `3-Reggeon vertex' Stefano Sciuto 246 Part IV The string 251 19 Introduction to Part IV 253 20 From dual models to relativistic strings Peter Goddard 270 21 The first string theory: personal recollections Leonard Susskind 301 22 The string picture of the Veneziano model Holger B. -
On RG-Flow and the Cosmological Constant
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by CERN Document Server On RG-flow and the Cosmological Constant. Erik Verlinde Physics Department, Princeton University, Princeton, NJ 08544 Abstract. From the AdS/CFT correspondence we learn that the effective action of a strongly coupled large N gauge theory satisfies the Hamilton-Jacobi equation of 5d gravity. Using an analogy with the relativistic point particle, I construct a low energy effective action that includes the Einstein action and obeys a Callan-Symanzik-type RG-flow equation. The flow equation implies that under quite general conditions the Einstein equation admits a flat space-time solution, but other solutions with non-zero cosmological constant are also allowed. I discuss the geometric interpretation of this result in the context of warped compactifications. This contribution is an expansion of the talk presented at the conference and is based on work reported in [1] and [2]. 1. Introduction The problem of the cosmological constant involves high energy as well as low energy physics. It is not just sufficient to have a zero cosmological constant at energies near the Planck scale, one also needs to explain the absence of vacuum contributions at much lower energy scales. This low energy aspect of the cosmological constant problem is the most puzzling, and seems to require a fundamental new insight in the basic principles of effective field theory, the renormalization group and gravity. String theory/M-theory, in whatever form it will eventually be formulated, has to provide a solution to this problem if it wants to earn a status as a true fundamental theory of our Universe. -
Gravity, Gauge Theory and Strings
Les Houches - Ecole d'Ete de Physique Theorique 76 Unity from Duality: Gravity, Gauge Theory and Strings Les Houches Session LXXVI, July 30 - August 31, 2001 Bearbeitet von Constantin P. Bachas, Adel Bilal, Michael R. Douglas, Nikita A. Nekrasov, Francois David 1. Auflage 2003. Buch. xxxiv, 664 S. Hardcover ISBN 978 3 540 00276 5 Format (B x L): 15,5 x 23,5 cm Gewicht: 1220 g Weitere Fachgebiete > Technik > Verfahrenstechnik, Chemieingenieurwesen, Lebensmitteltechnik Zu Inhaltsverzeichnis schnell und portofrei erhältlich bei Die Online-Fachbuchhandlung beck-shop.de ist spezialisiert auf Fachbücher, insbesondere Recht, Steuern und Wirtschaft. Im Sortiment finden Sie alle Medien (Bücher, Zeitschriften, CDs, eBooks, etc.) aller Verlage. Ergänzt wird das Programm durch Services wie Neuerscheinungsdienst oder Zusammenstellungen von Büchern zu Sonderpreisen. Der Shop führt mehr als 8 Millionen Produkte. Preface The 76th session of the Les Houches Summer School in Theoretical Physics was devoted to recent developments in string theory, gauge theories and quantum gravity. As frequently stated, Superstring Theory is the leading candidate for a unified theory of all fundamental physical forces and elementary parti- cles. This claim, and the wish to reconcile general relativity and quantum mechanics, have provided the main impetus for the development of the the- ory over the past two decades. More recently the discovery of dualities, and of important new tools such as D-branes, has greatly reinforced this point of view. On the one hand there is now good reason to believe that the underlying theory is unique. On the other hand, we have for the first time working (though unrealistic) microscopic models of black hole mechan- ics. -
Holographic Theory, and Emergent Gravity As an Entropic Force
Holographic theory, and emergent gravity as an entropic force Liu Tao December 9, 2020 Abstract In this report, we are going to study the holographic principle, and the possibility of describing gravity as an entropic force, independent of the details of the microscopic dynamics. We will first study some of the deep connections between Gravity laws and thermodynamics, which motivate us to consider gravity as an entropic force. Lastly, we will investigate some theoretical criticisms and observational evidences on emergent gravity. 1 Contents 1 Introduction3 2 Black holes thermodynamics and the holographic principle3 2.1 Hawking temperature, entropy..........................3 2.1.1 Uniformly accelerated observer and the Unruh effect.........3 2.1.2 Hawking temperature and black hole entropy..............6 2.2 Holographic principle...............................7 3 Connection between gravity and thermodynamics8 3.1 Motivations (from ideal gas and GR near event horizon)...........8 3.2 Derive Einstein's law of gravity from the entropy formula and thermodynamics 10 3.2.1 the Raychaudhuri equation........................ 10 3.2.2 Einstein's equation from entropy formula and thermodynamics.... 11 4 Gravity as an entropic force 13 4.1 General philosophy................................ 13 4.2 Entropic force in general............................. 13 4.3 Newton's law of gravity as an entropic force.................. 14 4.4 Einstein's law of gravity as an entropic force.................. 15 4.5 New interpretations on inertia, acceleration and the equivalence principle.. 17 5 Theoretical and experimental criticism 18 5.1 Theoretical criticism............................... 18 5.2 Cosmological observations............................ 19 20section.6 2 1 Introduction The holographic principle was inspired by black hole thermodynamics, which conjectures that the maximal entropy in any region scales with the radius squared, and not cubed as might be expected for any extensive quantities. -
Downloaded from Uva-DARE, the Institutional Repository of the University of Amsterdam (Uva)
Downloaded from UvA-DARE, the institutional repository of the University of Amsterdam (UvA) http://hdl.handle.net/11245/2.170831 File ID uvapub:170831 Filename Thesis Version final SOURCE (OR PART OF THE FOLLOWING SOURCE): Type PhD thesis Title The physics and mathematics of microstates in string theory: And a monstrous Farey tail Author(s) P. de Lange Faculty FNWI Year 2016 FULL BIBLIOGRAPHIC DETAILS: http://hdl.handle.net/11245/1.521428 Copyright It is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content licence (like Creative Commons). UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl) (pagedate: 2016-03-07) P a u A dissertation that delves l The Physics & d into physical and e L mathematical aspects of a Microstates Mathematics of n g string theory. In the first e part ot this book, Microstates in T microscopic porperties of h Moonshine e string theoretic black String Theory P h holes are investigated. The y s i second part is concerned c s Monster a with the moonshine and a Monstrous n d phenomenon. The theory Farey Tail M a of generalized umbral t h e moonshine is developed. m a Also, concepts in t i c monstrous moonshine are s o f used to study the entropy M i of certain two dimensional c r o conformal field theories. -
Anomaly-Free Supergravities in Six Dimensions
Anomaly-Free Supergravities in Six Dimensions Ph.D. Thesis arXiv:hep-th/0611133v1 12 Nov 2006 Spyros D. Avramis National Technical University of Athens School of Applied Mathematics and Natural Sciences Department of Physics Spyros D. Avramis Anomaly-Free Supergravities in Six Dimensions Dissertation submitted to the Department of Physics of the National Technical University of Athens in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics. Thesis Advisor: Alex Kehagias Thesis Committee: Alex Kehagias Elias Kiritsis George Zoupanos K. Anagnostopoulos A.B. Lahanas E. Papantonopoulos N.D. Tracas Athens, February 2006 Abstract This thesis reviews minimal N = 2 chiral supergravities coupled to matter in six dimensions with emphasis on anomaly cancellation. In general, six-dimensional chiral supergravities suffer from gravitational, gauge and mixed anomalies which, being associated with the breakdown of local gauge symmetries, render the theories inconsistent at the quantum level. Consistency of the theory is restored if the anomalies of the theory cancel via the Green-Schwarz mechanism or generalizations thereof, in a similar manner as in the case of ten-dimensional N = 1 supergravi- ties. The anomaly cancellation conditions translate into a certain set of constraints for the gauge group of the theory as well as on its matter content. For the case of ungauged theories these constraints admit numerous solutions but, in the case of gauged theories, the allowed solutions are remarkably few. In this thesis, we examine these anomaly cancellation conditions in detail and we present all solutions to these conditions under certain restrictions on the allowed gauge groups and representations, imposed for practical reasons.