Every countable infinite discrete group admits an ergodic action on any unital Kirchberg algebra, and every aperiodic automorphism of such an algebra has a unitary perturbation that is ergodic.
Endomorphisms of Z-absorbing C*-algebras without conditional expectations
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We construct an endomorphism of the Jiang-Su algebra $\mathcal{Z}$ which does not admit a conditional expectation. This answers a question in the testamentary homework by E. Kirchberg. As an application, it is shown that any unital separable nuclear $\mathcal{Z}$-absorbing C*-algebra is non-transportable in the Cuntz algebra $\mathcal{O}_2$.
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Ergodic automorphisms on Kirchberg algebras
Every countable infinite discrete group admits an ergodic action on any unital Kirchberg algebra, and every aperiodic automorphism of such an algebra has a unitary perturbation that is ergodic.