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

Orateur(s) Daniel Drimbe - KU Leuven,
Titre Superrigidity for dense subgroups of Lie groups and their actions on homogeneous spaces​
Horaire14:00 à 15:00
RésumeIn 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.
AdresseSophie Germain