During the academic year 2017-2018, Romain Tessera and I organized the weekly seminar Groups, Actions and von Neumann algebras at the Université Paris-Sud, Orsay.
The seminar featured both research and introductory talks on topics including geometric and measured group theory, ergodic theory and von Neumann algebras.
Meetings
Monday September 25
Narutaka Ozawa (RIMS Kyoto University)
Finite-dimensional representations constructed from random walks
Monday October 2
Cyril Houdayer (Université Paris-Sud)
The Kadison-Singer Problem (Part 1)
Monday October 9
Cyril Houdayer (Université Paris-Sud)
The Kadison-Singer Problem (Part 2)
Monday November 6
Amine Marrakchi (Université Paris-Sud)
The Kadison-Singer Problem (Part 3)
Tuesday November 7
Jérémie Brieussel (Université de Montpellier)
Shalom’s property HFD and Z-extensions of locally finite groups
Monday November 27
Romain Tessera (CNRS & Université Paris-Sud)
The Kadison-Singer Problem (Part 4)
Monday February 5
Yves de Cornulier (CNRS & Université Lyon 1)
Near actions
Monday February 12
Isaac Goldbring (University of California at Irvine)
Embedding problems, games, and square roots
Monday February 19
Stefan Witzel (Bielefeld University)
Simple groups separated by finiteness properties
Monday March 19
Piotr Nowak (Polish Academy of Sciences)
Property (T) for Aut(F_5)
Monday March 26
Federico Vigolo (University of Oxford)
Warped systems of actions on metric spaces
Monday April 9
Johannes Cuno (Ecole Normale Supérieure)
Random walks on Baumslag-Solitar groups
Monday April 16
Stefan Jung (Saarland University)
Partition quantum spaces
Monday April 23
Yair Hartman (Northwestern University)
Stationary C*-dynamical systems
Monday June 4
Simon André (Université de Rennes)
Hyperbolicity and first-order logic
Monday June 18
Amine Marrakchi (Université Paris-Sud)
PhD defense
Cyril Houdayer 