Turbulence, representations, and trace-preserving actions

Details Turbulence, representations, and trace-preserving actions Turbulence, representations, and trace-preserving actions

2008-08-13

arxiv.org/abs/0808.1907v1

Mathematics

Operator Algebras

27 pages

Scientific paper

We establish criteria for turbulence in certain spaces of C*-algebra representations and apply this to the problem of nonclassifiability by countable structures for group actions on a standard atomless probability space (X,\mu) and on the hyperfinite II_1 factor R. We also prove that the conjugacy action on the space of free actions of a countably infinite amenable group on R is turbulent, and that the conjugacy action on the space of ergodic measure-preserving flows on (X,\mu) is generically turbulent.

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