Séminaires : Séminaire d'Algèbres d'Opérateurs

Equipe(s) : ao,
Responsables :François Le Maître et Romain Tessera
Email des responsables :
Salle : 2015
Adresse :Sophie Germain
Description

Orateur(s) Sara Azzali - Universität Potsdam,
Titre Kasparov theory with real coefficients and secondary invariants
Date25/01/2018
Horaire14:00 à 15:00
RésumeThe KK-theory groups with real coefficients can be useful tools to encode certain properties of discrete group actions on C* algebras.
For instance, using the real KK-classes associated to traces on C* algebras, one can rephrase Atiyah’s L2 index theorem for coverings and generalise it to a property of group actions on C*-algebras, which can be called free and properness in K-theory. We will review these constructions and describe related secondary classes.
Based on joint work with Paolo Antonini and Georges Skandalis.
Salle2015
AdresseSophie Germain
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