5 papers · 1 filter
Selfless nonnuclear crossed products
Jamie Bell
For a strictly ergodic action of a countable discrete group with Ozawa's property PHP on the Cantor set, we prove that dynamical comparison implies complete selflessness of its red…
Factorisation and matrix amplification of real rank zero inclusions
Jamie Bell
We show that real rank zero is not preserved under matrix amplifications of inclusions. This yields real rank zero inclusions that do not approximately factor through real rank zer…
Nonamenable groups whose reduced group C*-algebras are not pure
Jamie Bell
We exhibit nonamenable groups whose reduced group C*-algebras are not pure. More precisely, if is any countably infinite discrete group, then the reduced group C*-algebra of th…
Nonnuclear Bunce-Deddens algebras
Jamie Bell
We introduce nonnuclear Bunce-Deddens algebras, defined as reduced crossed product C*-algebras associated with free odometer actions of nonamenable countable discrete residually fi…
Crossed product C*-algebras associated with non-minimal actions on the circle
Jamie Bell
We examine crossed product C*-algebras associated with free non-minimal actions of countably infinite discrete abelian groups on the circle, extending the work of Putnam, Schmidt,…