Topological dynamical systems associated to II_1 factors

Details Topological dynamical systems associated to II_1 factors Topological dynamical systems associated to II_1 factors

2010-10-06

arxiv.org/abs/1010.1214v3

Mathematics

Operator Algebras

30 pages, including an appendix written by Narutaka Ozawa, this version corrects a misattribution in the published paper (and

Scientific paper

If $N \subset \R$ is a separable II$_1$-factor, the space $\Hom(N,\R)$ of unitary equivalence classes of unital *-homomorphisms $N \to \R$ is shown to have a surprisingly rich structure. If $N$ is not hyperfinite, $\Hom(N,\R)$ is an infinite-dimensional, complete, metrizeable topological space with convex-like structure, and the outer automorphism group $\Out(N)$ acts on it by "affine" homeomorphisms. (If $N \cong R$, then $\Hom(N,\R)$ is just a point.) Property (T) is reflected in the extreme points -- they're discrete in this case. For certain free products $N = \Sigma \ast R$, every countable group acts nontrivially on $\Hom(N, \R)$, and we show the extreme points are not discrete for these examples. Finally, we prove that the dynamical systems associated to free group factors are isomorphic.

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