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)

11e séminaire ITZYKSON :Dénombrement de cartes : entre combinatoire, probabilités et physique théoriqueLe 11e séminaire Itzykson est organisé par Maxim Kontsevich (IHES), Sylvain Ribault (IPhT Saclay) et Pierre Vanhove (IPhT Saclay). Depuis une dizaine d’années l’axe math-physique de la Fondation Mathématique Jacques Hadamard (FMJH) organise un séminaire Itzykson tous les ans à l’IHES. Il s’agit d’une journée consacrée à un thème de physique mathématique, avec un cours en français et deux ou trois exposés spécialisés en français ou en anglais.Les cartes – surfaces obtenues par recollement de polygones le long de leurs arêtes – intéressent depuis des décennies différents domaines des mathématiques, de l’informatique et de la physique. En particulier, si le recollement est aléatoire, on obtient des cartes aléatoires, qui permettent de décrire des processus stochastiques. Si de plus on décore des cartes aléatoires, on peut décrire des modèles de physique statistique comme le modèle de boucles O(n).Durant cette journée seront présentés divers aspects des cartes, des problèmes de dénombrement aux applications physiques, des idées fondamentales aux développements récents.Un cours et deux exposés auront lieu dans la journée, présentés par : Mireille Bousquet-Mélou, CNRS, LaBRI, Université de BordeauxIgor Kortchemski, CNRS, École polytechnique & ETH ZurichJérémie Bouttier, IMJ-PRG, Sorbonne UniversitéL’inscription est gratuite mais nécessaire et sera possible jusqu’au 13 novembre 2023. 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.

French Japanese Conference on Probability & Interactions6-8 March 2024at IHES – Marilyn and James Simons Conference CenterHow to get to IHESThe conference aims at gathering French and Japanese researchers sharing common interests in probability theory related to physical phenomena. Various themes will be considered such as random matrices, stochastic PDEs, particle systems, models in disordered media. Although these domains are represented by different communities, the conference will be the occasion to analyze the connections that occur between those different thematics and to strengthen the collaborations between researchers of both countries.Speakers:Ismael Bailleul, Université de Bretagne OccidentaleQuentin Berger, Sorbonne UniversitéMireille Capitaine, Institut de Mathématiques de ToulouseNicolas Curien, Université Paris-SaclayNizar Demni, Aix-Marseille UniversitéClément Erignoux, Inria Lille Nord-Europe et Université de Lyon 1Masato Hoshino, Osaka UniversityTakashi Imamura (Chiba University)Naotaka Kajino, Kyoto UniversityMylène Maïda, Université de LilleKirone Mallick, CEA, IPhTShuta Nakajima, Meiji UniversityIzumi Okada, Chiba UniversityAkira Sakai, Hokkaido UniversityTomoyuki Shirai, Kyushu UniversityRyokichi Tanaka, Kyoto UniversityMilica Tomasevic, CNRS, École polytechniqueCristina Toninelli, CNRS, Université Paris Dauphine – PSLKenkichi Tsunoda, Kyushu UniversityJulien Vovelle, CNRS, ENS LyonScientific committee:Charles Bordenave (CNRS, Aix-Marseille Université), Benoît Collins (Kyoto University), Arnaud Debussche (ENS Rennes), Takashi Kumagai (Waseda University), Grégory Miermont (ENS Lyon), Tomohiro Sasamoto (Tokyo Institute of Technology).Organizing committee: Anne de Bouard (CNRS, École polytechnique), Thierry Bodineau (CNRS, IHES), Reika Fukuizumi (Waseda University).

Arithmetic Algebraic GeometryJan Nekovář was a mathematician who worked and has made many significant and seminal contributions to algebraic geometry. He left us prematurely in November 2022. Here is a tribute note (in French) by Pierre Colmez.In his memory, Anna Cadoret, IMJ-PRG, Wiesława Nizioł, IMJ-PRG, and Sarah Zerbes, ETH Zürich, organize a conference in arithmetic algebraic geometry at IHES from October 9th to 13th, 2023.This is an international conference in arithmetic geometry, aimed at covering some of the most recent advances in the field with a focus on the areas Jan Nekovář was interested in. Invited Speakers:Tomoyuki Abe, IPMU – University of Tokyo  Spencer Bloch, University of Chicago  Ana Caraiani, Imperial College London – University of BonnHenri  Darmon, McGill University  Vesselin Dimitrov, Institute for Advanced Studies  Matthew  Emerton, University of Chicago  Veronika  Ertl, Universitat Regensburg  Hélène Esnault, Frei Universität Berlin  Olivier Fouquet, Université de Franche-Comté Alexander Goncharov, Yale University  Giada Grossi, CNRS, Université Sorbonne Paris Nord      Jie Lin, Universität Duisburg-Essen  David  Loeffler, University of Warwick   Akhil Mathew, University of Chicago   James Newton, University of Oxford  Alexander Petrov, Harvard University  Alena Pirutka, New York University  Tony Scholl, University of Cambridge   Yunqing Tang, University of California – Berkeley  Jacob Tsimerman, University of Toronto    IHES thanks all the donors of the 2021 Friends of IHES Gala for making this conference possible.

À l’occasion du centenaire de la naissance de René Thom, l’IHES organise trois jours de conférence les 20, 21 et 22 septembre 2023. Conférenciers invités : Norbert A’Campo, Univ. De BâleDaniel Bennequin, Institut Mathématique de Jussieu (IMJ-PRG)Alain Chenciner, IMCCE/Observatoire de Paris Antoine Danchin, Institut Pasteur                     Ivar Ekeland, Université Paris-DauphineSara Franceschelli, ENS LyonEmmanuel Giroux, CNRS et ENSMikhail Gromov, IHESKrzysztof Kurdyka, Université Savoie Mont BlancCherif Matta, Mount Saint Vincent University, Halifax, CanadaJean Petitot, EHESSOscar Randal-Williams, Université de CambridgeAna Rechtman, Université Grenoble-AlpesDennis Sullivan, City University of New York, Graduate Center                       Bernard Teissier, IMJ-PRGWolfgang Wildgen, Université de BrêmeComité scientifique : Marie-Claude Arnaud, IMJ-PRG, Marc Chaperon, IMJ-PRG, coordinateur, Antoine Danchin, Institut Pasteur, Yakov Eliashberg, Stanford University, Maxim Kontsevich, IHES, Cédric Villani, Université Lyon I & IHESComité d’organisation : Jean-Pierre Bourguignon, IHESRené Thom (1923-2002)Professeur permanent à l’IHES de 1963 à 1990René Thom a couvert un champ scientifique immense : d’abord en ouvrant des champs nouveaux en topologie, cette branche des mathématiques qui s’intéresse aux formes à déformation près, et dans l’étude de la dynamique. Il a ensuite créé une « mathématique de la morphogenèse », proposant des modèles pour la biologie et aussi pour les sciences humaines.Ces proposi­tions, souvent regroupées sous le nom de « théorie des catastrophes », ont quelque fois été controversées. René Thom a consacré la suite de sa vie scientifique à l’étude de la biologie théorique et surtout à la philosophie aristotélicienne.

The scope of this in-person week-long meeting that will take place at the Institut des Hautes Études Scientifiques (IHES) in Bures-sur-Yvette, is to bring together scientists from the LSC Committee with invited experts and the IHES scientists to present the latest progress in understanding evolution as a process of learning, and conversely, evolution of learning, in the context of their respective disciplines, to fuel discussion of the challenges and brainstorm on synergistic solutions.INVITED SPEAKERS:INVITED SENIOR GUESTS:INVITED JUNIOR GUESTS:More details in the Profiles section. ORGANIZERS:Yves Barral, ETH ZurichEugene Koonin, NIHMikhail Gromov, IHES & NYUBob Penner, IHES & UCLASCIENTIFIC COMMITTEE:Yann LeCun, NYU & Meta AINicolas Minc, U. Paris Cité/CNRSPierre-Yves Oudeyer, INRIA BordeauxYukiko Yamashita, MITEXECUTIVE ORGANIZATION: Grazia Gonella, ETH ZurichCONTACT: lsc@biol.ethz.ch

“Wall-Crossing Structures, Analyticity, and Resurgence”,  a mini-school organized by Maxim Kontsevich and Yan Soibelman This conference is organized by Maxim Kontsevich (IHES), and Yan Soibelman (Kansas State University).The main emphasis will be on the new approach to resurgent series via analytic wall-crossing structures (an alternative to the traditional alien calculus), as well as the detailed study of examples coming from quantum Chern-Simons theory, WKB expansions and, more generally, holomorphic Floer theory.The program includes 3 mini-courses, given by:Jørgen E. Andersen (SDU)Maxim Kontsevich (IHES)Yan Soibelman (Kansas State University)and research presentations, given by:Philip Boalch (IMJ-PRG)Pierrick Bousseau (University of Georgia)Veronica Fantini (IHES)Segei Gukov (Caltech)Lotte Hollands (Heriot Watt University)Kohei Iwaki (The University of Tokyo)Marcos Mariño (University of Geneva)William Mistegård (SDU)David Sauzin (Observatoire de Paris-Meudon)Campbell Wheeler (MPI Bonn)

The year 2023 marks the centenary of the birth of Louis Michel, the first Professor of Theoretical Physics at IHES. On this occasion, Thibault Damour and Slava Rychkov organize a one-day commemoration on May 15, 2023, at IHES. Several presentations will be given by lecturers linked to Louis Michel or to his work:Jean-Pierre Bourguignon, CNRS-IHESHenri Epstein, CNRS-IHESDenis Gratias, CNRS-Institut de Recherche de Chimie ParisDavid Ruelle, IHESSlava Rychkov, IHESMarjorie Senechal, Smith CollegeBoris Zhilinskii, Univ. du Littoral Côte d’OpaleOrganizers: Thibault DAMOUR (IHES) and Slava Rychkov (IHES).

A Multiscale tour of Harmonic Analysis and Machine LearningTo Celebrate Stéphane Mallat’s 60th birthdayStéphane Mallat, professor at the Collège de France in data science, will be honored during a three-day workshop, April 19-21, 2023, organized by Joan Bruna, New York Univ., and Gabriel Peyré, CNRS-ENS, on the occasion of his 60th birthday. The purpose of this meeting is to bring together some of the characters of Data Analysis and Machine Learning, past, present, and future – and to celebrate the 60th birthday of a leading one, Stéphane Mallat, professor at Collège de France.His journey through Harmonic Analysis, Machine Learning, and Physics has profoundly influenced how these areas have evolved and blended together, and are now breaking new ground in our theoretical understanding of modern data analysis.Speakers:Akram Aldroubi, VanderbiltFrancis Bach, INRIARichard Baraniuk, RiceFreddy Bruckstein, TechnionEmmanuel Candès, StanfordMaureen Clerc, INRIAMaarten De Hoop, RiceDave Donoho, StanfordMichael Elad, TechnionRémi Gribonval, INRIAStéphane Jaffard, CréteilJérôme Kalifa, Let it CareHamid Krim, North Carolina State UniversityGitta Kutyniok, MünchenYann LeCun, New York University, and MetaEric Moulines, PolytechniqueEdouard Oyallon, CNRS and SorbonneNaoki Saito, UC DavisGuillermo Sapiro, DukeShihab Shamma, MarylandEero Simoncelli, New York UniversityJean-Jacques Slotine, MITMichael Unser, EPFLMartin Vetterli, EPFLIrène Waldspurger, CNRS and DauphineBin Yu, Berkeley 

Advances in Nonlinear Analysis and Nonlinear WavesFrank Merle, a mathematician, and holder of the Université de Cergy-Pontoise – IHES Chair in Analysis has made many important and seminal contributions to the qualitative study of solutions of nonlinear partial differential equations coming from Physics. Merle’s work has been pioneering in the sharp analysis of blowup solutions, and the collision of solitons, as well as in the soliton resolution conjecture. His groundbreaking works have been very influential in the field and beyond.Throughout his career, Frank Merle received many distinctions, including:ICM Invited Speaker (1998)Bôcher Memorial Prize – American Mathematical Society (2005)Silver Medal – Centre National de la Recherche Scientifique (2005)ERC Advanced Grant « Blow-up, Dispersion and Solitons » (2011)ICM Plenary Speaker (2014)Grand prix Ampère de l’électricité de France – French Academy of Sciences (2018)Member of the Academia Europaea (2020)The scientific objective of the conference is twofold. First, several experts in the field of dispersive and wave equations will present their recent advances. A second objective is to propose some conferences in analysis beyond the field of dispersive PDEs. The Scientific Committee hopes that all talks will be accessible to a general audience in analysis.Scientific Committee: M. Dafermos, A.-L. Dalibard, H. Duminil-Copin, T. Duyckaerts, E. Hebey, Y. Martel, G. Ponce, P. Raphaël, L. Saint-Raymond et H. ZaagOrganising Committee: C. Collot, R. Côte, F. Demengel, T. Duyckaerts, J. Jendrej, Y. Lan, E. Logak, Y. Martel, C. Muñoz, P. Raphaël, J. Szeftel, N. Tzvetkov et H. ZaagInvited Speakers:Henri Berestycki, EHESSNicolas Burq, Université de Paris-SaclaySimon Brendle, Columbia UniversityMaria Colombo, EPFLCamillo De Lellis, IASThierry Giamarchi, Université de GenèveFrançois Golse, École polytechniqueOana Ivanovici, CNRS & Sorbonne UniversitéCarlos Kenig, University of ChicagoSergiu Klainerman, Princeton UniversityPierre-Louis Lions, Collège de FranceNader Masmoudi, NYUHiroshi Matano, Meiji UniversityAndrea Nahmod, University of MassachusettsFelix Otto, Max-Planck Institut fur MathematikPierre Raphaël, University of CambridgeIgor Rodnianski, Princeton UniversityWilhelm Schlag, Yale UniversitySylvia Serfaty, NYUDaniel Tataru, UC BerkeleyLuis Vega, BCAMSijue Wu, University of MichiganThis event will be held at IHES, Bures-sur-Yvette, and at CY Advanced Studies, and is open to all.Registration is free and open until April 21, 2022.

The aim of this workshop is to bring together mathematicians and computer scientists around some talks on recent results from statistics, machine learning, and more generally data science research. Various topics in machine learning, optimization, deep learning, optimal transport, inverse problems, statistics, and problems of scientific reproducibility will be presented. This workshop is particularly intended for doctoral and post-doctoral researchers.Registration is free and open until March 1, 2023.Organizers: Gilles Blanchard (LMO/Université Paris-Saclay)Florence Tupin (LTCI/Télécom Paris)Invited speakers:Isabelle Bloch (LIP6/Sorbonne Université – LTCI/Télécom Paris)Antoine Cornuéjols (MIA/AgroParisTech)Aymeric Dieuleveut (CMAP/École polytechnique)Elisabeth Gassiat (LMO/Université Paris-Saclay)Mohammed Nabil El Korso (L2S/CentraleSupélec)Mathilde Mougeot (ENSIIE & Centre Borelli/ENS Paris-Saclay)