Miho Mukohara (Tokyo): On a Galois correspondence for compact group actions on simple
C*-algebras. Oberseminar C*-Algebren.
Tuesday, 24.10.2023 16:15 im Raum SRZ 216/217
It is a famous result proved by Izumi-Longo-Popa that if a
compact group G acts on a factor M, which has a separable predual,
and if this action is minimal, then every intermediate subfactor N
between M and M^G has a form of a fixed point algebra M^H for some
closed subgroup H of G. It is also well known as a duality result that
when M is a factor with an outer action of a discrete group G, then
every intermediate subfactor N between M and its crossed product by G
has a form of crossed product by some subgroup H of G. These one to
one correspondences between the set of subgroups and the set of
intermediate subfactors are called Galois correspondence.
In the case of C*-algebra, a Galois correspondence for finite group
actions on separable simple C*-algebras was proved by Izumi in 2001.
And recently, Cameron and Smith showed a Galois correspondence for
discrete group actions on simple C*-algebras.
In this seminar, I will talk about a Galois correspondence for
isometrically shift-absorbing actions of compact groups on separable
simple nuclear C*-algebras.
Angelegt am Tuesday, 29.08.2023 09:50 von Elke Enning
Geändert am Thursday, 19.10.2023 14:47 von Elke Enning
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