Séminaires : Séminaire d'Algèbres d'Opérateurs

 Equipe(s) : ao, Responsables : Pierre Fima, François Le Maître, Romain Tessera Email des responsables : Salle : 1013 Adresse : Sophie Germain Description

 Orateur(s) Daniel Drimbe - KU Leuven, Titre Superrigidity for dense subgroups of Lie groups and their actions on homogeneous spaces​ Date 18/11/2021 Horaire 14:00 à 15:00 Diffusion Résume In this talk we provide a class of infinite measure preserving actions that are W*-superrigid, i.e. the action can be completely recovered from its crossed product von Neumann algebra. In particular, we show that if $S$ is a set of primes that contains at least two elements, then the action of $PSL_2(\mathbb Z[S^{-1}])$ by fractional transformations on the upper half plane is W*-superrigid. This is a joint work with Stefaan Vaes. Salle 1013 Adresse Sophie Germain