The SEMPARIS seminar webserver hosts annoucements of all seminars taking place in Paris area, in all topics of physics, mathematics and computer science. It allows registered users to receive a selection of announcements by email on a daily or weekly basis, and offers the possibility to archive PDF or Powerpoint files, making it available to the scientific community.   [ More information ]

 Upcoming Seminars [ scheduler view ]

 Monday 25 January 2021, 10:45 at LPTMC, on-line zoom seminar ( https://zoom.us/j/95256910532 ID de réunion : 952 5691 0532 Code secret : 141152 ) SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall Francesca Pietracaprina ( Trinity College Dublin ) Many-Body Localization in 2D and constrained models Abstract: Many-body localization is a way to break ergodicity, thermalization and transport in disordered interacting quantum systems.The existence of a many-body localization transition in 2D systems is an open question that is being addressed experimentally, theoretically and numerically. In this talk, I will show some recent numerical results for a model whose features make it especially accessible to exact diagonalization. We numerically study the possibility of many-body localization transition in a constrained system: a disordered quantum dimer model on the honeycomb lattice. By using the peculiar constraints of this model and state-of-the-art exact diagonalization and time evolution methods, we probe large two-dimensional systems of up to N=108 sites. F Pietracaprina and F Alet, Arxiv Preprint arXiv:2005.10233 [cond-mat.dis-nn] (2020)

 Monday 25 January 2021, 11:00 at IPHT, (voir dans annonce) IPHT-PHM (Séminaire de physique mathématique) math-ph Monica Guica ( IPhT ) Infinite pseudo-conformal symmetry in classical TTbar, JTbar and JTa-deformed CFTs Abstract: I will start with a brief review of the irrelevant current-current deformations of two-dimensional QFTs introduced by Smirnov and Zamolodchikov, concentrating on the $T\bar T, J\bar T$ and $JT_a$ ones. I will then show that classical $T\bar T, J\bar T$ and $JT_a$ -deformed CFTs possess an infinite set of symmetries that take the form of a field- dependent generalization of two-dimensional conformal and, if applicable, $U(1)$ transformations. The Poisson bracket algebra of the associated conserved charges consists of two commuting copies of a functional Witt - (Ka\v{c}-Moody) algebra. One notes, however, that at semi-classical level on a cylinder, the equal spacing of the descendants' energies predicted by such a symmetry algebra is inconsistent with the known finite-size spectrum of the deformed CFTs. I will show how to resolve this tension in the specific case of $J\bar T$ - deformed CFTs, by exhibiting a new set of (classical) conserved charges, which are related to the previous symmetry generators by a type of energy-dependent spectral flow. The above results suggest then that $T\bar T, J\bar T$ and $JT_a$ -deformed CFTs correspond to non-local versions of usual two-dimensional conformal field theories, a structure that would be interesting to explore further. \\ \\ The seminar is online only. \\ Internet link to be collected from the Organizer: Vincent Pasquier (vincent.pasquier@ipht.fr)

 Monday 25 January 2021, 16:00 at LPNHE, Online ( Contact seminaires@lpnhe.in2p3.fr for Zoom link ) LPNHE (Séminaires du LPNHE) hep-ex Andrea De Gouvêa ( Northwestern University ) TBD

 Tuesday 26 January 2021, 14:00 at APC, https://unige.zoom.us/j/93722626572 APC-TH (Seminar of the theory group of APC) gr-qc Eemeli Tomberg ( NICPB ) A numerical approach to stochastic inflation and primordial black holes Abstract: Primordial black holes are a dark matter candidate, which may originate from strong perturbations created during inflation. These perturbations can be studied using the formalism of stochastic inflation. I present a numerical approach to this problem, where the stochastic dynamics is solved by generating a large number of random realizations. This makes it possible to go beyond analytical approximations and take into account additional effects such as backreaction between the perturbations and the background. I show that in an example model with an inflection point potential and ultra-slow-roll inflation, compatible with CMB measurements, stochastic effects produce a highly non-Gaussian tail for the perturbations, which changes the predictions for black hole production significantly.

 Tuesday 26 January 2021, 16:00 at IHP, Seminar via zoom https://ijclab.zoom.us/j/94900481972 P^3 (Particle Physics in Paris) astro-ph|hep-ph Pedro Machado ( Fermilab ) New ideas and opportunities at future liquid argon neutrino experiment Abstract: In this talk I will highlight some special experimental capabilities of future liquid argon time projection chamber (LArTPCs) neutrino experiments like the Fermilab’s Short Baseline Neutrino Program and DUNE. I will give a broad overview of what could be gained with these capabilities. Then, I will provide concrete physics opportunities that are enabled by LArTPCs, including measuring the CP violation phase with atmospheric neutrinos, searching for light dark matter, and performing precision electroweak physics measurements.

 Thursday 28 January 2021, 11:00 at LPTHE, Zoom and bibliothèque du LPTHE, tour 13-14, 4eme étage ( This seminar will be given in hybrid mode. People who wish to attend in person should contact Ander Retolaza. Zoom: https://zoom.us/j/97507124810 (pwd= 1234 ) ) RENC-THEO (Rencontres Théoriciennes) hep-th Eric Perlmutter ( Caltech & IPhT ) A CFT Distance Conjecture Abstract: We formulate a series of conjectures relating the geometry of conformal manifolds to the spectrum of local operators in conformal field theories in d>2 spacetime dimensions. We focus on conformal manifolds with limiting points at infinite distance with respect to the Zamolodchikov metric. Our central conjecture is that all theories at infinite distance possess an emergent higher-spin symmetry, generated by an infinite tower of currents whose anomalous dimensions vanish exponentially in the distance. Stated geometrically, the diameter of a non-compact conformal manifold must diverge logarithmically in the higher-spin gap. Our conjectures are related to the Distance Conjecture in the swampland program. We discuss the supporting evidence, their holographic interpretation, and implications for superconformal field theories.

 Monday 1 February 2021, 10:45 at LPTMC, on-line zoom seminar ( https://zoom.us/j/95015087598 ID de réunion : 950 1508 7598 Code secret : 599922 ) SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall Riccardo Ben Ali Zinati ( LPTMC Paris ) A bird's eye view on discrete universalities Abstract: Our modern understanding of universality, namely the independence of the critical properties of a system from its microscopic details, is based on the ideas put forward by K. Wilson and formalised within the framework of the renormalization group (RG). Despite the centrality of the subject in modern days theoretical Physics and the many decades passed since Wilson's original works, the classification of universality classes is to date largely unsolved. In recent years, however, the functional reformulation of the perturbative RG provided a simple tool to approach such a classification, extending significantly our knowledge of universality classes entailed by discrete symmetry groups in scalar field theories. In this talk, I will first introduce the technique, elucidate its key-point features and explain why it is so effective in charting the theory space. In passing, I briefly review the theory of invariant polynomials paying particular attention to the so-called Hilbert (or Molien) series. I will then focus on three particular cases: the scalar field theories endowed with the symmetry group of regular polytopes, the randomly diluted Ising models and the more general hyper-cubic scalar field theories. For each of these three cases, I review the main results and suggest possible lines of future investigations. References: https://arxiv.org/abs/1902.05328 https://arxiv.org/abs/2006.12808

 Tuesday 2 February 2021, 14:00 at APC, https://unige.zoom.us/j/93722626572 APC-TH (Seminar of the theory group of APC) gr-qc Suddhasattwa Brahma ( McGill University ) Detecting quantum entanglement in the sky Abstract: Although inflation is broadly accepted to be the standard paradigm for early universe cosmology, many of its quantum properties remain unknown. For instance, the crowning glory of inflation lies in explaining late-time macroscopic inhomogeneities as arising from tiny quantum fluctuations; however, most of the established literature ignores the crucial role that entanglement between the modes of the fluctuating field plays in its observable predictions. In this talk, I shall discuss how treating observable long-wavelength modes as part of an open quantum system can significantly affect the dynamics (and detectable consequences) of inflation, even when considering the nonlinearities arising solely from gravity. Since these dissipative effects are at the heart of decoherence (and how quantum fluctuations turn classical), such primordial entanglement is inescapable and provides universal upper bounds on the duration of inflation.

 Tuesday 2 February 2021, 14:00 at LPTHE, Seminar via zoom https://zoom.us/j/95696803823 LPTHE-PPH (Particle Physics at LPTHE) astro-ph|hep-ph|hep-th Mathias Pierre ( IFT Madrid ) TBA

 Tuesday 2 February 2021, 17:00 at LPTENS, GoToMeeting STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th Gustavo Joaquin Turiaci ( UCSB ) TBA

 Thursday 4 February 2021, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) cond-mat|hep-th|math.MP Johannes Kellendonk ( Institut Camille Jordan, Université Claude Bernard Lyon 1 ) The non-commutative topological approach to topological phases with protecting symmetry Abstract: In this talk we review the K-theoretic description of topological phases of insulators and superconductors in the effective one particle approximation. In that approximation, an insulator (or superconductor) is described by a Hamiltonian whose spectrum has a gap at the Fermi energy. Two Hamiltonians belong to the same topological phase if they can be deformed into each other without closing the gap. For this to be well-defined, it is important to specify the space of possible Hamiltonians with its topology. When this space is taken to be a C*-algebra equipped with a real structure and a grading, one can use real graded K-theory and its dual (K-homology or cyclic cohomology) to describe the topological phases and their numerical topological invariants.

 Friday 5 February 2021, 14:00 at LPTENS, GoToMeeting STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th Karim Noui ( APC and Tours University ) TBA

 Monday 8 February 2021, 10:45 at LPTMC, on-line zoom seminar ( https://zoom.us/j/3863193200 ID de réunion : 386 319 3200 Code secret : 044816 ) SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall Adriano Angelone ( Sissa and ICTP Trieste ) Strongly Correlated Systems of Bosons and Fermions: Many-body phenomena and Numerical Methods (provisoire) Abstract: TBA

 Tuesday 9 February 2021, 16:00 at IHP, Seminar via zoom https://ijclab.zoom.us/j/94900481972 ( This seminar will be followed by the one of Constantinos Skordis (University of Cyprus and Czech Academy of Sciences) at 16:30 ) P^3 (Particle Physics in Paris) astro-ph|hep-ph|hep-th David Spergel ( Princeton University ) MOND day - TBA

 Tuesday 9 February 2021, 16:30 at IHP, Seminar via zoom https://ijclab.zoom.us/j/94900481972 ( This seminar follows the one at 16:00 by David Spergel (Princeton University) ) P^3 (Particle Physics in Paris) astro-ph|hep-ph|hep-th Constantinos Skordis ( University of Cyprus and Czech Academy of Sciences ) MOND day - TBA

 Friday 19 February 2021, 14:00 at LPTENS, GoToMeeting STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th Andrea Wulzer ( CERN and EPFL and Padua ) TBA

 Tuesday 23 February 2021, 16:00 at IHP, Seminar via zoom https://ijclab.zoom.us/j/94900481972 P^3 (Particle Physics in Paris) hep-ph|hep-th Jesse Thaler ( MIT ) TBA

 Friday 5 March 2021, 11:00 at APC, https://u-paris.zoom.us/j/84776224570?pwd=ZWNLMEQ0bThsWGJuL0IvbnUxTEpxUT09 APC-COLLOQUIUM (Colloquium de l'APC) hep-th Mikhail Shaposhnikov ( EPFL Lausanne ) TBA Abstract: TBA

 seminars All Next Week This Week Today Tomorrow Upcoming Within a Week from series All ACFTA APC APC-COLLOQUIUM APC-TH BH-TOP BI-COSMO-IHP BI-SEM-IHP BIOPHY-ENS-ESPCI BISEMINAIRE-MP COLLOQUIUM-ENS CONDMAT-ENS CONDMAT-THEO COSMO-P6 COURS COURS-FED COURS-IPHT COURS@IAP CPHT - PHDSEM CPHT PHYS MATH CPHT- BS CPHT-JOUR CPHT-LLR CPMC DISQUANT ESPCI-COLLOQUE ESPCI/PCT FCMP FORUM-ENS FOUNDPHYS GDT-MODSTO GQ GR-COSMO IAP-SEM IDRIS-SEM IHP-ALG IHP-NONEQ IHPSTRMATH IJCLAB-COSM IMJ-AA IMJ-AUT IMJ-CHE IMJ-EAA IMJ-REP IMP-MATH-PHYS INST-ETE IPHT-DAP IPHT-GEN IPHT-HEP IPHT-MAT IPHT-PHM IPHT-SEM IPHT-STA IPN-X IPNO-DR JOUR-CLUB LP(N/T)HE LPENS-ACE LPENS-MDQ LPNHE LPS-MAGN LPS-MAT-MOL LPS-VULG LPS/ENS LPT-GEN LPT-LPTMS LPT-MAG LPT-PHYSMATH LPT-PTH LPTENS-HE LPTHE-DOC LPTHE-PPH LPTMS LPT_STAT MAG-SUPRA MAT-COND-GEN MATH-IHES MECA-STAT MOTFEYN MSC NUC-THEO PART-PHYS PHEN-PART PHYS-ESPCI PLATEAU PMMH PT-IHES P^3 RENC-THEO RENORMALISATION S-LPTENS SAMM SCOPI SEM-BESSON SEM-CPHT SEM-CSNSM SEM-DARBOUX SEM-EXCEP SEM-FED SEM-GRECO SEM-GRECO-IAP SEM-IBPC SEM-ILP SEM-INFOR SEM-INSP SEM-LAL SEM-LKB SEM-LLR SEM-LPT SEM-LPTENS SEM-LPTHE SEM-LPTM-UCP SEM-LPTMC SEM-LPTMS SEM-LUTH SEM-PHYS-ENS SEM-PMMH SEM-POINCA SEM-UPR5 SOUTEN-HDR SOUTEN-TH SPEC-LARSIM SPEC-SEM STR-LPT-ENS-HE STR-LPTHE STRINT TH-JEUX TH-MAT-COND TRANSPORT TRI-SEMINAIRE WG-EXPTH-LPN/THE WORK-CONF at institute All APC CDF CITEU CPHT CSNSM CURIE DPT-PHYS-ENS ENPC ESPCI ESPCI/UPR5 GRETIA IAP IBPC IDRIS IHES IHP IJCLAB IM-JUSSIEU-PRG IMPMC INSP IPHT IPN LAL LARSIM LKB LLR LMPT LPA LPENS LPMA LPNHE LPNHE-GR-TH LPP LPS-ORSAY LPS/ENS LPT LPTENS LPTHE LPTM LPTMC LPTMS LUTH MSC OBSPARIS PCT/ESPCI PMMH SAMM SPEC UPMC in subject All CoRR -- Computing Research Repository CoRR.AI -- Artificial Intelligence CoRR.AR -- Architecture CoRR.CC -- Computational Complexity CoRR.CE -- Computational Engineering CoRR.CG -- Computational Geometry CoRR.CL -- Computation and Language CoRR.CR -- Cryptography and Security CoRR.CV -- Computer Vision and Pattern Recognition CoRR.CY -- Computers and Society CoRR.DB -- Databases CoRR.DC -- Distributed, Parallel, and Cluster Computing CoRR.DL -- Digital Libraries CoRR.DM -- Discrete Mathematics CoRR.DS -- Data Structures and Algorithms CoRR.GL -- General Literature CoRR.GR -- Graphics CoRR.GT -- Computer Science and Game Theory CoRR.HC -- Human-Computer Interaction CoRR.IR -- Information Retrieva CoRR.IT -- Information Theory CoRR.LG -- Learning CoRR.LO -- Logic in Computer Science CoRR.MA -- Multiagent Systems CoRR.MM -- Multimedia; CoRR.MS -- Mathematical Software CoRR.NA -- Numerical Analysis CoRR.NE -- Neural and Evolutionary Computing CoRR.NI -- Networking and Internet Architecture CoRR.OH -- Other CoRR.OS -- Operating Systems CoRR.PF -- Performance CoRR.PL -- Programming Languages CoRR.RO -- Robotics CoRR.SC -- Symbolic Computation CoRR.SD -- Sound CoRR.SE -- Software Engineering astro-ph -- Astrophysics cond-mat -- Condensed Matter cond-mat.dis-nn -- Disordered Sys. and Neural Networks cond-mat.mes-hall -- Mesoscopic Sys. and Q.Hall Effect cond-mat.mtrl-sci -- Materials Science cond-mat.other -- Other cond-mat.soft -- Soft Condensed Matter cond-mat.stat-mech -- Statistical Mechanics cond-mat.str-el -- Strongly Correlated Electrons cond-mat.supr-con -- Superconductivity gr-qc -- General Relativity and Quantum Cosmology hep-ex -- High Energy Physics - Experiment hep-lat -- High Energy Physics - Lattice hep-ph -- High Energy Physics - Phenomenology hep-th -- High Energy Physics - Theory math -- Mathematics math-ph -- Mathematical Physics math.AC -- Commutative Algebra math.AG -- Algebraic Geometry math.AP -- Analysis of PDEs math.AT -- Algebraic Topology math.CA -- Classical Analysis and ODEs math.CO -- Combinatorics math.CT -- Category Theory math.CV -- Complex Variables math.DG -- Differential Geometry math.DS -- Dynamical Systems math.FA -- Functional Analysis math.GM -- General Mathematics math.GN -- General Topology math.GR -- Group Theory math.GT -- Geometric Topology math.HO -- History and Overview math.KT -- K-Theory and Homology math.LO -- Logic math.MG -- Metric Geometry math.MP -- Mathematical Physics math.NA -- Numerical Analysis math.NT -- Number Theory math.OA -- Operator Algebras math.OC -- Optimization and Control math.PR -- Probability math.QA -- Quantum Algebra math.RA -- Rings and Algebras math.RT -- Representation Theory math.SG -- Symplectic Geometry math.SP -- Spectral Theory math.ST -- Statistics nlin -- Nonlinear Sciences nlin.AO -- Adaptation and Self-Organizing Systems nlin.CD -- Cellular Automata and Lattice Gases nlin.CG -- Chaotic Dynamics nlin.PS -- Exactly Solvable and Integrable Systems nlin.SI -- Pattern Formation and Solitons nucl-ex -- Nuclear Experiment nucl-th -- Nuclear Theory physics -- Physics physics.acc-ph -- Accelerator Physics physics.ao-ph -- Atmospheric and Oceanic Physics physics.atm-clus -- Atomic and Molecular Clusters physics.atom-ph -- Atomic Physics physics.bio-ph -- Biological Physics physics.chem-ph -- Chemical Physics physics.class-ph -- Classical Physics physics.comp-ph -- Computational Physics physics.data-an -- Data Analysis physics.ed-ph -- Physics Education physics.flu-dyn -- Fluid Dynamics physics.gen-ph -- General Physics physics.geo-ph -- Geophysics physics.hist-ph -- History of Physics physics.ins-det -- Instrumentation and Detectors physics.med-ph -- Medical Physics physics.optics -- Optics physics.plasm-ph -- Plasma Physics physics.pop-ph -- Popular Physics physics.soc-ph -- Physics and Society physics.space-ph -- Space Physics q-bio -- Quantitative Biology qbio.BM -- Biomolecules qbio.CB -- Cell Behavior qbio.GN -- Genomics qbio.MN -- Molecular Networks qbio.NC -- Neurons and Cognition qbio.OT -- Other qbio.PE -- Populations and Evolution qbio.QM -- Quantitative Methods qbio.SC -- Subcellular Processes; Tissues and Organs qbio.TO -- Tissues and Organs quant-ph -- Quantum Physics with field Speaker Title Abstract Subject matching

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