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Crossed-products by locally compact groups and intermediate subfactors.

Presented by: 
Arnaud Brothier Università degli Studi di Roma Tor Vergata
Date: 
Wednesday 25th January 2017 - 13:30 to 14:30
Venue: 
INI Seminar Room 1
Abstract: 
I will present examples of an action of a totally disconnected group G on a factor Q such that intermediate subfactors between Q and the crossed-product correspond to closed subgroups of G. This extends previous work of Choda and Izumi-Longo-Popa. I will discuss about the analytical difference with the case of actions of discrete groups regarding the existence of conditional expectations or operator valued weights. Finally I will talk about intermediate subfactors in the context of actions of Hecke pairs of groups. This is a joint work with Rémi Boutonnet.
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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons