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On the amenable subalgebras of group von Neumann algebras

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arxiv 2309.10494 v3 pith:A6PTOZCR submitted 2023-09-19 math.OA math.DSmath.FAmath.PR

classification math.OAmath.DSmath.FAmath.PR
keywords amenableinvariantgammaneumannalgebrasgroupirasmaximal
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abstract

We approach the study of sub-von Neumann algebras of the group von Neumann algebra $L\Gamma$ for countable groups $\Gamma$ from a dynamical perspective. It is shown that $L(\Gamma)$ admits a maximal invariant amenable subalgebra. The notion of invariant probability measures (IRAs) on the space of sub-algebras is introduced, analogous to the concept of Invariant Random Subgroups. And it is shown that amenable IRAs are supported on the maximal amenable invariant sub-algebra.

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