Adam Skalski

Invariant von Neumann subalgebras of crossed products and tensor products

Let $\Gamma$ be a countable discrete group acting on a tracial von Neumann algebra $(Q,\tau_Q)$ in a trace-preserving way. We study invariant von Neumann subalgebras of $Q\rtimes\Gamma$ and of $L(\Gamma)\bar\otimes Q$, where the latter is equipped with the diagonal action. We show that, under the pointwise weak mixing...