Residually finite actions and crossed products
Operator Algebras
2011-05-31 v2 Dynamical Systems
Abstract
We study a notion of residual finiteness for continuous actions of discrete groups on compact Hausdorff spaces and how it relates to the existence of norm microstates for the reduced crossed product. Our main result asserts that an action of a free group on a zero-dimensional compact metrizable space is residually finite if and only if its reduced crossed product admits norm microstates, i.e., is an MF algebra.
Keywords
Cite
@article{arxiv.1104.1216,
title = {Residually finite actions and crossed products},
author = {David Kerr and Piotr W. Nowak},
journal= {arXiv preprint arXiv:1104.1216},
year = {2011}
}
Comments
final version, to appear in Ergodic Theory and Dynamical Systems