Special Colloquium

Shirly Geffen, Universität Münster

"Dynamical comparison and nonamenable groups"

We pull back paradoxical dynamical systems (e.g. hyperbolic  groups acting on their Gromov boundary), to paradoxical decompositions of the acting group itself. This allows to show that whenever such groups admit a minimal amenable topologically free action on a compact Hausdorff space, the attached crossed product C*-algebra is classified by K-theoretic data.

This is joint work with Eusebio Gardella, Julian Kranz, and Petr Naryshkin.

MC 5501