RIS ID
77217
Abstract
We study conditions that will ensure that a crossed product of a C-algebra by a discrete exact group is purely infinite (simple or non-simple). We are particularly interested in the case of a discrete non-amenable exact group acting on a commutative C-algebra, where our sufficient conditions can be phrased in terms of paradoxicality of subsets of the spectrum of the abelian C-algebra. As an application of our results we show that every discrete countable non-amenable exact group admits a free amenable minimal action on the Cantor set such that the corresponding crossed product C-algebra is a Kirchberg algebra in the UCT class.
Publication Details
Rordam, M. & Sierakowski, A. (2012). Purely infinite C-algebras arising from crossed products. Ergodic Theory and Dynamical Systems, 32 (1), 273-293.