The Cubic CFT can be understood as the O(3) invariant CFT perturbed by a slightly relevant operator. In this paper, we use conformal perturbation theory together with the conformal data of the O(3) vector model to compute the anomalous dimension of scalar bilinear operators of the Cubic CFT. When the Z2 symmetry that flips the signs of φi is gauged, the Cubic model describes a certain phase transition of a quantum dimer model. The scalar bilinear operators are the order parameters of this phase transition. Based on the conformal data of the O(3) CFT, we determine the correction to the critical exponent as η_Cubic-η_O(3)≈ -0.0215(49). The O(3) data is obtained using the numerical conformal bootstrap method to study all four-point correlators involving the four operators: v=φ_i, s=∑_i φ_iφ_i and the leading scalar operators with O(3) isospin j=2 and 4. According to large charge effective theory, the leading operator with charge Q has scaling dimension Δ_Q=c_3/2 * Q^3/2+c_1/2 * Q1^/2. We find a good match with this prediction up to isospin j=6 for spin 0 and 2 and measured the coefficients c_3/2 and c_1/2.  Pour être informé des prochains séminaires vous pouvez vous abonner à la liste de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme sujet: « subscribe seminaire_physique PRENOM NOM »(indiquez vos propres prénom et nom) et laissez le corps du message vide.

10e séminaire ITZYKSON :Valeurs zêta multiples et fonctions modulaires de graphes en théorie des cordes  Le 10e séminaire Itzykson est organisé par Maxim Kontsevich (IHES), Stéphane Nonnenmacher (IMO, Univ. Paris-Saclay), Sylvain Ribault (IPhT Saclay) et Pierre Vanhove (IPhT Saclay). Dans leur développement à basse énergie, les amplitudes de diffusion en théorie des champs et en théorie des cordes ont des propriétés remarquables liées à la théorie des nombres, notamment en ce qui concerne l’invariance modulaire. Ainsi, certaines amplitudes sont déterminées par une classe de valeurs zêta multiples univaluées découvertes par Francis Brown. L’analyse des amplitudes de diffusion a conduit à la découverte de formes modulaires nouvelles généralisant au cas elliptique ces valeurs zêta multiples univaluées. Durant cette journée seront présentés divers aspects de la relation entre les propriétés physiques des amplitudes, des développements récents en théorie des nombres, et de nouvelles formes modulaires. Le cours présentera les notions fondamentales qui seront ensuite développées dans deux séminaires.Trois cours auront lieu dans la journée, présentés par : Pierre Vanhove, IPhT SaclayFederico Zerbini, OxfordEric Perlmutter, IPhT SaclayL’inscription est gratuite mais nécessaire et sera possible jusqu’au 10 novembre 2022. Un buffet-déjeuner sera offert aux participants qui s’y seront inscrits. Le séminaire sera filmé et diffusé en différé sur la chaîne YouTube de l’IHES.

December 2023 marks Yvonne Choquet-Bruhat’s 100th birthday. For this special occasion, IHES organizes a day in her honor on December 8, 2023.Registration is free but mandatory.Yvonne Choquet-Bruhat’s work has had a long-lasting impact on the field of mathematical relativity starting with her seminal 1952 paper on the local well-posedness of Einstein equations. Her numerous contributions, both to constraint equations and to the evolution problem in general relativity, have deeply influenced several generations of researchers. This special day in her honor will be the occasion to present some of the latest developments in the field.Invited Speakers:Thibault Damour, IHES  Michael Eichmair, University of Vienna  Cécile Huneau, École polytechniqueSergiu Klainerman, Princeton University   Organizers: Laure Saint-Raymond (IHES) & Jérémie Szeftel (Laboratoire Jacques-Louis Lions)

En l’honneur du mathématicien Jacques Tits, un colloque de quatre demi-journées sur trois jours est organisé au Collège de France du 11 au 13 décembre 2023, organisé par Jean-Pierre Bourguignon, Michel Broué, Philippe Gille et Guy Rousseau. L’inscription au colloque est gratuite.Conférenciers invités :Michael BATEEmmanuel BREUILLARDPierre-Emmanuel CAPRACEJessica FINTZENAnne LONJOUTom DE MEDTSBernhard MÜHLHERRAnne QUÉGUINER-MATHIEUAnne PARREAUZev ROSENGARTENJean-Pierre SERREGernot STROTH Conseil scientifique :Michel BRIONNGÔ Bão ChâuAlain VALETTERichard WEISS

Combinatorics and Arithmetic for Physics: special daysTenth Anniversary EditionThe meeting focuses on questions of discrete mathematics and number theory, emphasizing computability. Problems are drawn mainly from theoretical physics: renormalization, combinatorial physics, geometry, evolution equations (commutative and noncommutative), or related to its models, but not only. Computations, based on combinatorial structures (graphs, trees, words, automata, semirings, bases), or classical structures (operators, Hopf algebras, evolution equations, special functions, categories) are good candidates for computer-based implementation and experimentation.Organized by: Gérard H. E. DUCHAMP, Maxim KONTSEVICH, Gleb KOSHEVOY, Sergei NECHAEV, and Karol A. PENSON.Speakers:Marek Bozejko (Institute of Mathematics Wroclaw University)Ricardo Buring (INRIA)Philippe Di Francesco (UIUC)Gérard H. E. Duchamp (LIPN, Université Paris Nord) Harold Erbin (CTP, MIT, USA)Stéphane Gaubert (INRIA, CMAP, École polytechnique)Volker Genz (IBS CGP)Darij Grinberg (Drexel University) Dimitry Gurevich (IITP, Moscou) Yuki Kanabuko (MPIM, Bonn)Rinat Kedem (UIUC)Maxim Kontsevich (IHES)Gleb Koshevoy (IITP, Moscow & IHES)Thomas Krajewski (CPT, Marseille)Marek Kus (Center for Theoretical Physics)Hiroaki Nakamura (Osaka University) Toshiki Nakashima (Sophia University Tokyo) Hadrien Notarantonio (Inria Saclay)Karol A. Penson (LPTMC, Sorbonne Université) Eric Pichon-Pharabod (Université Paris-Saclay)Sanjaye Ramgoolam (Queen Mary University of London)Travis Scrimshaw (Hokkaido University) Andrea Sportiello (LIPN, Université Paris Nord)Adrian Tanasa (Université de Bordeaux)Vasily Sazonov (CEA)Jean-Bernard Zuber (LPTHE, Sorbonne Université)Karol Życzkowski (Jagiellonian University)Sponsors: IHES – Math-STIC – LIPN (UMR-7030) – LPTMC (Univ-Paris 6) – INRIA – GDR EFI – CEAScientific Committee:Joseph Ben Geloun (LIPN-Paris XIII), Alin Bostan (INRIA), Marek Bozejko (Wroclaw University), Vincent Rivasseau (Orsay-CEA)

Séminaire informel sur les intersections atypiquesI will recall how understanding the geometry of jumping loci for algebraic cycles in families of smooth projective complex varieties can be reinterpreted as an unlikely intersection problem. I will then present joint work with David Urbanik using this point of view to give sufficient conditions for the analytic density of these loci in the base of the family. ========Pour être informé des prochains séminaires vous pouvez vous abonner à la liste de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme sujet: « subscribe seminaire_mathematique PRENOM NOM »(indiquez vos propres prénom et nom) et laissez le corps du message vide.

Period integrals are a fundamental concept in algebraic geometry and number theory. In this talk, we will study the notion of non-archimedean periods as introduced by Kontsevich and Soibelman.  We will give an overview of the non-archimedean SYZ program, which is a close analogue of the classical SYZ conjecture in mirror symmetry. Using the non-archimedean SYZ fibration, we will prove that non-archimedean periods recover the analytic periods for log Calabi-Yau surfaces, verifying a conjecture of Kontsevich and Soibelman. This is joint work with Jonathan Lai.  Pour être informé des prochains séminaires vous pouvez vous abonner à la liste de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme sujet: « subscribe seminaire_mathematique PRENOM NOM »(indiquez vos propres prénom et nom) et laissez le corps du message vide. 

Séminaire informel sur les intersections atypiquesThis is part one of a two part lecture, the second of which will be given by Greg Baldi. In the first part we introduce a unified framework for studying « geometric » unlikely intersection problems, which in particular includes all such problems arising from (mixed) Hodge theory, and prove a general geometric Zilber-Pink theorem in this context, subsuming previous results of this nature. The proofs are also effective, in the sense that they give explicit algorithms to compute the relevant atypical loci. In the second part we will explain how this common framework also applies to characterise geometric unlikely intersection phenomena beyond the Hodge-theoretic setting, and in particular to orbit closures in strata of abelian differentials. ========Pour être informé des prochains séminaires vous pouvez vous abonner à la liste de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme sujet: « subscribe seminaire_mathematique PRENOM NOM »(indiquez vos propres prénom et nom) et laissez le corps du message vide.

Séminaire informel sur les intersections atypiquesThis is part two of a two part lecture, the first one of which  was  given by David Urbanik. In the first part we introduce a unified  framework for studying « geometric » unlikely intersection problems,  which in particular includes all such problems arising from (mixed)  Hodge theory, and prove a general geometric Zilber-Pink theorem in  this context, subsuming previous results of this nature. The proofs are also effective, in the sense that they give explicit algorithms to compute the relevant atypical loci. In the second part we will explain how this common framework also applies to characterise geometric unlikely intersection phenomena beyond the Hodge-theoretic setting, and in particular to orbit closures in strata of abelian differentials. ========Pour être informé des prochains séminaires vous pouvez vous abonner à la liste de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme sujet: « subscribe seminaire_mathematique PRENOM NOM »(indiquez vos propres prénom et nom) et laissez le corps du message vide.

Lattices in semi-simple Lie groups of rank at least 2 — e.g. SL(n,Z) for n>2 — form a class of discrete groups known for having remarkable linear rigidity properties. Notably, their finite dimensional representations are determined by those of the ambient Lie group they live in — e.g. SL(n,R) in the case of SL(n,Z). This is Margulis’ super-rigidity theorem (1974). Motivated by an ergodic version of this theorem, an ambitious program initiated by Gromov and Zimmer in the 1980s aims to understand « non-linear representations » of such lattices into diffeomorphism groups of closed manifolds, or in other words, the differentiable actions of such lattices on closed manifolds.I will first discuss the history and geometric origins of this program. I will then focus on rigidity results about actions of lattices which preserve non-unimodular geometric structures, such as conformal or projective structures, and will mention open directions. The proofs build on recent advances on Zimmer’s conjectures, especially an invariance principle which provides existence of finite invariant measures in various dynamical contexts.

Approximate lattices are discrete subsets of locally compact groups that are an aperiodic generalisation of lattices. They are defined as approximate subgroups (i.e. subsets that are closed under multiplication up to a finite multiplicative error) that are discrete and have finite co-volume. They were first studied by Yves Meyer who classified them in locally compact abelian groups by means of the so-called « cut-and-project schemes ». Approximate lattices were subsequently used to model a diversity of objects such as aperiodic tilings (Penrose and the « hat »), Pisot numbers, and quasi-crystals.In non-abelian groups, however, their structure remained mysterious. I will explain how the structure of approximate lattices in linear algebraic groups can be understood thanks to a notion of cohomology that sits halfway between bounded cohomology and the usual cohomology, thus generalising Meyer’s theorem. Along the way, we will talk about Pisot numbers, extending a theorem of Lubotzky, Mozes and Raghunathan, amenability and (some) model theory.

Séminaire informel sur les intersections atypiquesI will present some recent results obtained with  Andrei Yafaev on André-Pink-Zannier and generalised Hecke orbits in Shimura varieties, such as moduli spaces of abelian varieties. ========Pour être informé des prochains séminaires vous pouvez vous abonner à la liste de diffusion en écrivant un mail à sympa@listes.math.cnrs.fr avec comme sujet: « subscribe seminaire_mathematique PRENOM NOM »(indiquez vos propres prénom et nom) et laissez le corps du message vide.