Groupoids and operator algebras. Applications to analysis, geometry and dynamics.

21 mai 2019, 13:00 → 24 mai 2019, 14:15 Europe/Paris

Hôtel Dupanloup (Orléans)

Conference in honor of Jean Renault

This conference aims to bring together mathematicians working on groupoids and operator algebras, a field in which Jean Renault has been an expert for many years. The theory is rich enough to have applications in very different fields such as analysis, geometry and dynamics. This meeting will definitely be a great opportunity to discuss these applications. We would like to highlight the central role played by groupoids as a unifying language and to promote them among young researchers.

Download titles and abstracts (pdf).
Download the poster (pdf).

Abstracts.pdf

Poster.jpg

mardi 21 mai

13:45 → 14:00 Welcome

14:00 → 14:30 Some observations regarding the contributions of Jean Renault as seen from Boulder, Arlan Ramsay

14:40 → 15:25 Groupoid methods and singular spaces in free analysis

Orateur: Paul Muhly (University of Iowa)

Muhly.pdf

15:30 → 16:00 Coffee Break

16:05 → 16:50 Blowup and deformation groupoids in relation with index theory

Orateur: Claire Debord (Université Paris Diderot)

Debord.pdf

17:00 → 17:45 Witten deformation and Lie groupoids

Orateur: Omar Mohsen (Université Paris Diderot)

Mohsen.pdf

17:55 → 18:30 Remembering Victor, Alla Kuznetsova and Jean Renault

Orateur: Alla Kuznetsova (Kazan Federal University, Institute of Physics)

Kuznetsova.pdf

Renault.pdf

mercredi 22 mai

09:00 → 09:45 Pseudodifferential operators from tangent groupoids

Orateur: Robert Yuncken

Yuncken.pdf

09:55 → 10:15 Coffee Break

10:20 → 11:05 Diffeological groupoids and their operator algebras

Orateur: Iakovos Androulidakis

Androulidakis.pdf

11:15 → 12:00 Stability of Lie groupoid C*-algebras and of C*-algebras of singular foliations

Orateur: Georges Skandalis (Université Paris Diderot)

Skandalis.pdf

12:15 → 13:30 Lunch

14:00 → 14:45 Fourier integral operators on Lie groupoids

Orateur: Stephane Vassout

Vassout.pdf

14:50 → 15:35 K-theory, groupoids and propagation

Orateur: Herve Oyono-Oyono

Oyono.pdf

15:40 → 16:00 Coffee Break

16:05 → 16:50 The homology of ample groupoids and the Matui conjecture

Orateur: Alex Kumjian

Kumjian.pdf

17:00 → 17:45 CCR flows associated to closed convex cones

Orateur: Sundar Shanmugasundaram (Institute of Mathematical Sciences)

Sundar.pdf

jeudi 23 mai

09:00 → 09:45 A groupoid approach to classifiable C*-algebras

Orateur: Xin Li

XinLi.pdf

09:55 → 10:15 Coffee Break

10:20 → 11:05 Weak Cartan subalgebras of C*-algebras

Orateur: Ruy Exel (UFSC & UNL)

Exel.pdf

11:15 → 12:00 Groupoids from minimal dynamical systems

Orateur: Karen Strung (Radboud University)

Strung.pdf

12:15 → 13:30 Lunch

13:50 → 14:35 Crossed products and amenability of group actions

Orateur: Siegfried Echterhoff

Echterhoff.pdf

15:00 → 17:30 Visite de la cathédrale d'Orléans

19:15 → 22:00 Conference dinner

https://www.restaurant-lachancellerie.fr

vendredi 24 mai

09:00 → 09:45 On the first cohomology group of a free minimal Z^d-action on the Cantor set

Orateur: Thierry Giordano

Giordano.pdf

09:55 → 10:15 Coffee Break

10:20 → 11:05 On non-standard limits of graphs and some orbit equivalence invariants

Orateur: Damien Gaboriau (CNRS Ens-Lyon)

Gaboriau.pdf

11:15 → 12:00 Classification of regular subalgebras of the hyperfinite II_1 factor

Orateur: Stefaan Vaes (KU Leuven)

Vaes.pdf

12:15 → 13:30 Lunch