English

Classifying crossed product C*-algebras

Operator Algebras 2015-04-08 v2

Abstract

I combine recent results in the structure theory of nuclear C*-algebras and in topological dynamics to classify certain types of crossed products in terms of their Elliott invariants. In particular, transformation group C*-algebras associated to free minimal Z^d-actions on the Cantor set with compact space of ergodic measures are classified by their ordered K-theory. In fact, the respective statement holds for finite dimensional compact metrizable spaces, provided that projections of the crossed products separate tracial states. Moreover, C*-algebras associated to certain minimal homeomorphisms of odd dimensional spheres are only determined by their spaces of invariant Borel probability measures (without a condition on the space of ergodic measures). Finally, I show that for a large collection of classifiable C*-algebras, crossed products by Z^d-actions are generically again classifiable.

Keywords

Cite

@article{arxiv.1308.5084,
  title  = {Classifying crossed product C*-algebras},
  author = {Wilhelm Winter},
  journal= {arXiv preprint arXiv:1308.5084},
  year   = {2015}
}

Comments

some corrections and explanations added; 22 pages; to appear in American Journal of Mathematics

R2 v1 2026-06-22T01:13:54.469Z