W$^*$-superrigidity for coinduced actions

TL;DR

This paper establishes W*-superrigidity for a broad class of coinduced actions, including Bernoulli actions of certain groups, by analyzing their operator algebraic properties and group actions.

Contribution

It proves W*-superrigidity for coinduced actions from amenable almost-malnormal subgroups of ICC property (T) groups and for groups measure equivalent to products of infinite groups.

Findings

W*-superrigidity holds for coinduced actions from specific subgroups.

Bernoulli actions of certain ICC groups are W*-superrigid.

Results extend to groups measure equivalent to products of infinite groups.

Abstract

We prove W$^*$-superrigidity for a large class of coinduced actions. We prove that if $\Sigma$ is an amenable almost-malnormal subgroup of an infinite conjugagy class (icc) property (T) countable group $\Gamma$, the coinduced action $\Gamma\curvearrowright X$ from an arbitrary probability measure preserving action $\Sigma\curvearrowright X_0$ is W$^*$-superrigid. We also prove a similar statement if $\Gamma$ is an icc non-amenable group which is measure equivalent to a product of two infinite groups. In particular, we obtain that any Bernoulli action of such a group $\Gamma$ is W$^*$-superrigid.