During the academic year 2019-2020, I am organizing the weekly seminar Groups, Actions and von Neumann algebras at the Université Paris-Sud, Orsay.

The seminar features both research and introductory talks on topics including analytic, geometric and measured group theory, ergodic theory and von Neumann algebras.

Meetings

Monday September 23

Cyril Houdayer (Université Paris-Sud)

Stationary characters on lattices of semisimple Lie groups (part I)

Monday September 30

Cyril Houdayer (Université Paris-Sud)

Stationary characters on lattices of semisimple Lie groups (part II)

Monday October 14

Jean Lécureux (Université Paris-Sud)

Strong property (T) for groups acting on affine buildings

Monday November 18

Yusuke Isono (RIMS, Kyoto University)

Unitary conjugacy for type III subfactors and W*-superrigidity

Monday November 25

Amine Marrakchi (CNRS & ENS Lyon)

Ergodic theory of affine isometric actions on Hilbert spaces

Monday December 2

Sven Raum (Stockholm University)

C*-superrigidity of 2-step nilpotent groups