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Due to the evolution of the health situation related to the Coronavirus epidemic, the conference will finally be totally on line. The Zoom link will be sent in the confirmation mail.

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Algebraic Structures in Perturbative Quantum Field Theory
A conference in honour of Dirk Kreimer’s 60th birthday

On the occasion of Dirk Kreimer’s birthday, there will be a special issue of SIGMA on « Algebraic Structures in Perturbative Quantum Field Theory ».

Perturbative quantum field theory is essential for precision calculations of observables measured in experiments like the LHC, and therefore it is crucial for our understanding of the physics of the universe. At the same time, it is an extremely rich source of connections to a wide range of active research areas in mathematics. For example, Feynman integrals give rise to interesting motives and periods in algebraic geometry, their renormalization rests on combinatorial Hopf algebras underlying Feynman graphs, and further relations to noncommutative geometry and the moduli space of tropical curves and outer space have also been discovered.

This growing program keeps expanding in both breadth and depth, and exciting young researchers are entering the field. Now is an opportune time to bring together scientists working on all related aspects, to review old and new connections and to advance the state of the art. Lectures by established scientists will be accompanied by talks from young researchers, including a session dedicated to present and discuss open problems.

Close collaborations between mathematicians and physicists have been absolutely key for this kind of research, and many were initiated by Dirk Kreimer. Throughout his career, he made substantial contributions across these topics and led students and collaborators to the profound mathematical structures in perturbative quantum field theory that we are aware of today. Dirk Kreimer spent a particularly productive time at the IHES, and it is an honour that this workshop takes place in its inspiring and interdisciplinary environment.

Organisers: Erik PANZER (University of Oxford) & Karen YEATS (University of Waterloo)

Invited speakers include:

Ali Assem Mahmoud, University of Waterloo
Marc Bellon, LPTHE (Sorbonne Université)
Marko Berghoff, Humboldt-Universität
Spencer Bloch, University of Chicago
Johannes Blümlein, DESY Zeuthen
Michael Borinsky, Nikhef
David Broadhurst, The Open University
Francis Brown, University of Oxford
Yvain Bruned, University of Edinburgh
Alain Connes, IHES & Collège de France
Andrei Davydychev, Moscow State University
Gérald Dunne, University of Connecticut
Kurusch Ebrahimi-Fard, NTNU Trondheim
Loïc Foissy, Université du Littoral Côte d’Opale
Hadleigh Frost, University of Oxford
John Gracey, University of Liverpool
Martin Hairer, Imperial College London
Ralph Kaufmann, Purdue University
Thomas Krajewski, CPT Aix-Marseille
Dominique Manchon, CNRS & Université Clermont-Auvergne
Lukas NABERGALL, University of Waterloo
Sylvie Paycha, Institut für Mathematik Potsdam
Oliver Schnetz, FAU Erlangen-Nürnberg
Christian Schubert, Universidad Michoacana de San Nicolas de Hidalgo
Matt Szczesny, Boston University
Walter van Suijlekom, Radboud Universiteit Nijmegen
Karen Vogtmann, University of Warwick
Raimar Wulkenhaar, Westfälische Wilhelms-Universität Münster

 

Organized with the support of:

The aim of this workshop is to bring together mathematicians and computer scientists around some talks on recent results in statistics and machine learning. Various topics will be presented, among which network reconstruction, natural language processing, extreme events, topological data analysis, non parametric estimation for random walks in random environment and online learning.

Organised by : Sylvain ARLOT and Guillaume CHARPIAT

Invited speakers :

Alexandre Allauzen (Université Paris-Sud, LIMSI)
Frédéric Chazal (INRIA Saclay)
Isabelle Guyon (Université Paris-Sud, LRI)
Matthieu Lerasle (CNRS, LMO)
Vianney Perchet (CMLA)
Anne Sabourin (Télécom ParisTech)

 

MASAKI KASHIWARA and ALGEBRAIC ANALYSIS

The story starts in the sixties, when Mikio Sato introduces hyperfunctions by algebraic methods with the dream to treat classical problems of analysis with the tools of algebraic geometry, homological algebra and sheaves, what he called "Algebraic Analysis".

Read more on Giuseppe Dito's web page

 

List of speakers:

    Anton ALEKSEEV (Université de Genève)
    Philip BOALCH (Université Paris-Sud)
    Anna CADORET (Ecole Polytechnique)
    Giovanni FELDER (ETH Zürich)
    Julien GRIVAUX (Aix-Marseille Université, IHES)
    Stéphane GUILLERMOU (Université Grenoble Alpes)
    Mikhail KAPRANOV (IPMU, The University of Tokyo)
    Masaki KASHIWARA (RIMS, Kyoto University)
    Maxim KONTSEVICH (IHES)
    François LOESER (Université Paris 6)
    Takuro MOCHIZUKI (RIMS, Kyoto University)
    Motohico MULASE (UC Davis)
    Hiraku NAKAJIMA (RIMS, Kyoto University)
    Marco ROBALO (Université Paris 6)
    Raphaël ROUQUIER (UCLA)
    Takeshi SAITO (The University of Tokyo)
    David TREUMANN (Boston College)
    Michèle VERGNE (Université Paris 7)
    Gabriele VEZZOSI (Università di Firenze)
    Tony Yue YU (Université Paris-Sud)

Organising Committee:

     Giuseppe Dito  (Université de Bourgogne)
     Maxim Kontsevich  (IHES)
     Pierre Schapira  (Université Paris 6)

 

The aim of this workshop is to bring together mathematicians and computer scientists around some talks on recent results in statistics and machine learning. Various topics will be presented, among which sequential learning, aggregation of estimators, Hidden Markov models, network inference and optimization for machine learning.

Organised by : Sylvain ARLOT

Invited speakers :

Pierre Alquier (ENSAE)
Stéphane Gaiffas (Ecole Polytechnique)
Claire Lacour (Université Paris-Sud)
Odalric-Ambrym Maillard (INRIA – Université Paris-Sud)
Yann Ollivier (CNRS – Université Paris-Sud)
Joseph Salmon (LTCI, CNRS, Télécom ParisTech)

 

 

Holder of the AXA-IHÉS Chair of Mathematics

Certainly, geometry in the 21st century with physical application, will involve the study of new kinds of objects with categorical structures playing a primordial role.
Maxim Kontsevich has been a force of nature in creating these new categorical structures in the last 20 years.
The goal of this conference is to celebrate his contributions to Mathematics and Physics.
This meeting­ will contribute to disseminate results on­ a variety of subjects and will ­serve a perfect opportunity for young scientists to get involved in top research. ­

Invited speakers

Mohammed ABOUZAID (Columbia Univ., New York USA)
Denis AUROUX (U.C. Berkeley, USA)
Tom BRIDGELAND (Univ. of Sheffield, UK)
Alain CONNES (IHÉS-Collège de France, Paris, France)
Kevin COSTELLO (Northwestern Univ., Evanston, USA)
Emanuel DIACONESCU (Univ. of Alberta, Canada)
Simon DONALDSON (Simons Center for Geometry and Physics, Stony Brook, USA)
Alexander EFIMOV (Steklov Mathematical Institute, RAS, Moscow, Russia)
Yakov ELIASHBERG (Stanford Univ., USA)
Kenji FUKAYA (Simons Center for Geometry and Physics, Stony Brook, USA)
Alexander GONCHAROV (Yale Univ., New Haven, USA)
Sergei GUKOV (Caltech, Pasadena, USA)
Mikhail KAPRANOV (Kavli Institute for the Physics and Mathematics of the Universe (WPI), Tokyo)
Anton KAPUSTIN­  (Caltech, Pasadena, USA)
François LOESER (Univ. Pierre-et-Marie-Curie and IHÉS, France)
Yuri MANIN (MPIM ­Bonn, Germany)
Nikita NEKRASOV (Simons Center for Geometry and Physics, Stony Brook, USA)
Tony PANTEV (Univ. of Pennsylvania, Philadelphia, USA)
Graeme SEGAL (Univ. of Oxford, UK)
Paul SEIDEL  (MIT, Cambridge, USA)
Carlos SIMPSON (CNRS-Univ. de Nice, France)
Yan SOIBELMAN (Kansas State Univ., Manhattan, USA)
Richard THOMAS (Imperial College London, UK)
Bertrand TOËN (CNRS-Univ. de Montpellier 2, France)
Yuri TSCHINKEL (Courant Institute & Simons Foundation, New York, ­USA)
Claire VOISIN (CNRS-École Polytechnique, Palaiseau, France)
Thomas WILLWACHER (ETH Zürich, Switzerland)
Shing-Tung YAU (Chinese Univ. of  Hong Kong,  China and Harvard Univ., USA)
Don ZAGIER (Collège de France, Paris and MPIM Bonn, Germany)
Anton ZORICH (Univ. Paris-Diderot, France)

 

With the support of the Clay Mathematics Institute and the FMJH

      

COMPUTATIONAL AND STATISTICAL TRADE-OFFS IN LEARNING

Organized by: Sylvain Arlot (Université Paris-Sud, Paris-Saclay), Francis Bach (INRIA Paris), Alain Celisse (Université de Lille 1)

This workshop focuses on the computational and statistical trade-offs arising in various domains (optimization, statistical/machine learning).
This is a challenging question since it amounts to optimize the performance under limited computational resources, which is crucial in the large-scale data context.
One main goal is to identify important ideas independently developed in some communities that could benefit the others.

Speakers :

Pierre Alquier (ENSAE, Paris-Saclay)
Alexandre d'Aspremont (D.I., CNRS/ENS Paris)
Quentin Berthet (DPMMS, Cambridge Univ., UK)
Alain Celisse (Université de Lille 1)
Rémi Gribonval (INRIA, Rennes)
Emilie Kaufmann (CNRS, Lille)
Vianney Perchet (CREST, ENSAE Paris-Saclay)
Garvesh Raskutti (Wisconsin Institute for Discovery, Madison, USA)
Ohad Shamir (Weizmann Institute, Rehovot, Israel)
Silvia Villa (Istituto Italiano di Tecnologia, Genova & MIT, Cambridge, USA)

 

Organisers: Thibault Damour (IHES), Vasily Pestun (IHES), Eliezer Rabinovici (IHES &  Hebrew Univ. of Jerusalem)

The special properties of Black Holes have intrigued researchers for decades. They do signal their existence in nature in several ways including by emitting gravitational waves while merging. Their way of handling information is more elusive. In this workshop we plan to discuss mostly several aspects of this information handling with some emphasis on possible relations it has to the theory of chaos, thermalization and quantum information.

Invited speakers:

     BARBON José (IFT-CSIC, Univ. Autonoma de Madrid)
     BENA Iosif (CEA Saclay)
     CRAPS Ben (Vrije Univ. Brussel)
     DE BOER Jan  (Univ. of Amsterdam)
     FERRARI Frank (Univ. Libre de Bruxelles)
     GIBBONS Gary  (DAMTP, Cambridge Univ.)
     GURAU Razvan (CPHT, Ecole polytechnique)
     KURCHAN Jorge (ENS, Paris)
     MALDACENA Juan (IAS, Princeton)
     PAGE Don N. (Univ. of Alberta, Canada)
     PAPADODIMAS Kyriakos (CERN, Genève)
     RIVASSEAU Vincent (Univ. Paris-Sud, Orsay)
     ROSENHAUS Vladimir (UC Santa Barbara)
     SHEPELYANSKY Dima  (Univ. Paul Sabatier, Toulouse)
     SOLODUKHIN Sergey (Univ. de Tours)
     VENEZIANO Gabriele (CERN, Genève)

 

As part of the IHES-Huawei partnership, this one-day workshop is organised by the Huawei's Mathematical and Algorithmic Sciences Lab jointly with IHÉS and aims at creating scientific exchanges around mathematical topics that are essential for the development and innovation of the ICT.

 

Si vous souhaitez vous inscrire pour le repas de midi, veuillez envoyer un mail à Elisabeth Jasserand : jasserand@ihes.fr

Arithmetic and Algebraic Geometry:

A conference in honor of Ofer Gabber on the occasion of his 60th birthday

List of speakers includes:

     Y. André (CNRS & IMJ-PRG),
     A. Beilinson (University of Chicago),
     B. Bhatt (University of Michigan),
     B. Conrad (Stanford),
     G. Faltings (MPIM),
     D. Gaitsgory (Harvard),
     K. Kato (University of Chicago),
     N. Katz (Princeton),
     M. Kisin (Harvard),
     G. Laumon (Université Paris-Sud),
     G. Lusztig (MIT),
     M. Olsson (UC Berkeley),
     F. Orgogozo (CNRS & École polytechnique),
     L. Ramero (Université de Lille I),
     T. Saito (University of Tokyo),
     P. Scholze (Universität Bonn),
     A. Shiho (University of Tokyo),
     Y. Varshavsky (Hebrew University of Jerusalem),
     A. Vasiu (Binghamton University),
     G. Williamson (University of Sydney),
     W. Zheng (Morningside Center of Mathematics)

Organising Committee:

     A. Abbes (CNRS & IHÉS),
     S. Bloch (University of Chicago),
     L. Illusie (Université Paris-Sud),
     B. Mazur (Harvard)

Organized in partnership with