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A Galois correspondence for reduced crossed products of unital simple C$^*$-algebras by discrete groups (1706.01803v2)

Published 6 Jun 2017 in math.OA

Abstract: Let a discrete group $G$ act on a unital simple C$*$-algebra $A$ by outer automorphisms. We establish a Galois correspondence $H\mapsto A\rtimes_{\alpha,r}H$ between subgroups of $G$ and C$*$-algebras $B$ satisfying $A\subseteq B \subseteq A\rtimes_{\alpha,r}G$, where $A\rtimes_{\alpha,r}G$ denotes the reduced crossed product. For a twisted dynamical system $(A,G,\alpha,\sigma)$, we also prove the corresponding result for the reduced twisted crossed product $A\rtimes\sigma_{\alpha,r}G$.

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