A class of II${}_1$ factors without non-trivial crossed product decompositions

Adriana Fernández Quero, Adrian Ioana, Hui Tan

We introduce a class of separable II${}_1$ factors $M$ admitting no non-trivial crossed product decompositions: $M\ncong B{⋊}_{\sigma }G$, for any trace preserving action $G\curvearro…