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arXiv 1104.4339math.OA
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von Neumann algebras上的离散amenable group作用与不变核C*-子代数

Discrete amenable group actions on von Neumann algebras and invariant nuclear C*-subalgebras

Yasuhiko Sato

摘要:

设$G$是可数离散顺从群,${\cal M}$是McDuff因子vonNeumann代数,$A$是${\cal M}$的可分核弱稠密$^*$ -子代数.我们表明,如果两个中心自由行动的$G$对${\cal M}$不同的近似内自同构,然后他们是外共轭的近似内自同构,在运营商的范数拓扑,这使得$A$不变。另外,当$A$是单位的、简单的、有唯一迹态的,且$α$是$A$的自同构时,我们还证明了$α$在von Neumann代数上的非周期性等价于弱Rohlin性质.

英文摘要:

Let $G$ be a countable discrete amenable group, ${\cal M}$ a McDuff factor von Neumann algebra, and $A$ a separable nuclear weakly dense C$^*$-subalgebra of ${\cal M}$. We show that if two centrally free actions of $G$ on ${\cal M}$ differ up to approximately inner automorphisms then they are outer conjugate by an approximately inner automorphism, in the operator norm topology, which makes $A$ invariant. In addition, when $A$ is unital, simple, and with a unique tracial state and $α$ is an automorphism of $A$ we also show that the aperiodicity of $α$ on the von Neumann algebra is equivalent to the weak Rohlin property.

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