Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

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 at LPTHE
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Thursday 21 March 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th
Nalini Anantharaman ( IRMA, Strasbourg ) Quantum ergodicity on graphs : from spectral to spatial delocalization
Abstract: We study the eigenfunctions of discrete Schrödinger operators on finite graphs of large size, and their (de)localization properties. To measure delocalization, we use a criterion of "quantum ergodicity" borrowed from the subject of quantum chaos. We can prove delocalization in this sense for some families of graphs, typically : regular graphs and their small perturbations. We show that quantum ergodicity is related to ``spectral delocalization'', namely the fact that the spectrum of the ideal infinite system is absolutely continuous.

Friday 22 March 2019, 11:00 at LPTHE, Bibliothèque SEM-LPTHE (Séminaire du LPTHE) cond-mat.stat-mech|hep-th
Stam Nicolis ( Institut Denis Poisson, Tours ) Anisotropic gauge theories: from chiral fermions to new phases of matter
Abstract: We review the effect of introducing anisotropic couplings for lattice gauge theories and show that these can lead to new, ``layered'', phases, beyond the bulk confining and Coulomb phases, known in abelian gauge theories. The new phases can be interpreted as describing the effects of flux compactifications and generalize the Kaluza-Klein paradigm of extra dimensions. Extra dimensions have been, in fact, used to describe defects in condensed matter systems and anisotropic gauge theories can be also understood as allowing the description of more elaborate defects. Coupling matter to the gauge fields leads to a consistent, non-perturbative, description of chiral fermions, provided the anomalies are properly cancelled, and can describe edge states and their currents while scalar fields lead to a quite elaborate phase diagram. The challenges of assembling these ingredients to study supersymmetric theories will be touched on, as a way of describing how such systems can be consistently closed, a la Parisi-Sourlas.

Tuesday 26 March 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph|hep-th
Ben Page ( IPhT, Saclay ) Analytics from Numerics: Planar Two-Loop Five-Point QCD Amplitudes
Abstract: Two-loop scattering amplitudes are a vital component in high-precision cross section calculations at the LHC. At higher multiplicities, the increased number of scales can make the algebra of analytic amplitude calculations intractable. In this talk, we discuss how to apply numerical techniques to sidestep this intermediate complexity and combine them with physical properties of the amplitude to efficiently determine its analytic form. In particular we focus on planar five-point amplitudes in QCD.

Thursday 28 March 2019, 10:00 at IHP, 201 RENC-THEO (Rencontres Théoriciennes) hep-th
Gabriele Veneziano ( College de France, CERN ) Soft gravitational radiation from high energy collisions: a progress report
Abstract: I will review recent developments on soft gravitational radiation from ultra-relativistic collisions. Calculations based on recent developments in the eikonal approach and in soft-graviton theorems can be successfully compared in their common region of applicability. Combining the results of both approaches leads to a knee in the spectrum at a typical "Hawking frequency” and to a bump at wavelengths comparable to the impact parameter of the collision.

Thursday 28 March 2019, 11:40 at IHP, 201 RENC-THEO (Rencontres Théoriciennes) hep-th
Michele Del Zotto ( Durham ) TBA

Friday 29 March 2019, 11:00 at LPTHE, Bibliothèque SEM-LPTHE (Séminaire du LPTHE) cond-mat.stat-mech|hep-th|math|math-ph|math.AG
Sanjay Ramassamy ( ENS Paris ) Dimers and circle patterns
Abstract: The dimer model is a model from statistical mechanics corresponding to random perfect matchings on graphs. Circle patterns are a class of embeddings of planar graphs such that every face admits a circumcircle. In this talk I describe a correspondence between dimer models on planar bipartite graphs and circle pattern embeddings of these graphs. As special cases of this correspondence we recover the Tutte embeddings for resistor networks and the s-embeddings for Ising models. This correspondence is also the key for studying Miquel dynamics, a discrete integrable system on circle patterns.

Thursday 4 April 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th
Nicolas Curien ( Orsay ) TBA

Thursday 11 April 2019, 11:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Hadi Godazgar ( AEI Potsdam ) TBA

Thursday 11 April 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Balt Van Rees TBA

Tuesday 16 April 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Alan Cornell ( Witwatersrand U. ) TBA

Tuesday 30 April 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Luca Panizzi ( Uppsala ) TBA

Thursday 9 May 2019, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Chris Herzog ( King's College, London ) TBA

Thursday 9 May 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Jan De Boer ( University of Amsterdam ) TBA

Tuesday 14 May 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Kimberly Boddy ( John Hopkins ) TBA

Thursday 16 May 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th
Yan Soibelman ( Kentucky State University ) TBA

Friday 17 May 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Ranjan Laha ( Mainz/CERN ) TBA

Thursday 23 May 2019, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Lauria TBA

Thursday 23 May 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Tba TBA

Friday 7 June 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Biswarup Mukhopadhyaya ( HCRI ) TBA

Thursday 13 June 2019, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Luest TBA

Thursday 13 June 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Tba TBA

Friday 14 June 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Alejandro Ibarra ( TMU ) TBA

Thursday 20 June 2019, 10:00 at IHP, Salle 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Anton Kapustin ( Caltech ) TBA

Thursday 20 June 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Mateos TBA

Thursday 27 June 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th
Alexander Goncharov ( Yale University ) TBA

seminars from series at institute
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