Superrigidity for dense subgroups of Lie groups and their actions on homogeneous spaces

Daniel Drimbe, Stefaan Vaes

An essentially free group action of $\Gamma$ on $(X,\mu )$ is called W*-superrigid if the crossed product von Neumann algebra $L^{\infty }(X)⋊\Gamma$ completely remembers the group $\Gamma$ and…