The Automorphism group of a simple tracially AI algebra

Details The Automorphism group of a simple tracially AI algebra The Automorphism group of a simple tracially AI algebra

2007-03-22

arxiv.org/abs/math/0703674v1

Mathematics

Operator Algebras

35 pages

Scientific paper

10.1007/s00220-008-0478-5

The structure of the automorphism group of a simple TAI algebra is studied. In particular, we show that $\frac{\bar{\mrm{Inn}} (A)}{\bar{\mrm{Inn}}_{0} (A)}$ is isomorphic (as a topological group) to an inverse limit of discrete abelian groups for a unital, simple, AH algebra with bounded dimension growth. Consequently, $\frac{\bar{\mrm{Inn}} (A)}{\bar{\mrm{Inn}}_{0} (A)}$ is totally disconnected. Another consequence of our results is the following: Suppose $A$ is the transformation group \cstar-algebra of a minimal Furstenberg transformation $(\mbb{T}^{n}, h_{n})$ with a unique $h_{n}$-invariant probability measure on $\mbb{T}^{n}$. Then the automorphism group of $A$ is an extension of a simple topological group by the discrete group $\mrm{Aut} (\totalk(A))_{+,1}$.

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