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arXiv 1004.0128math.OA
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群因子中的最大内射和混合Masas

Maximal injective and mixing masas in group factors

Paul Jolissaint

摘要:

给出了一类有限vonNeumann代数对$A\subset M$,其中$A$是具有可分预对偶的$\mathrm{II}_1$型因子$M$中的极大内射masa.我们的结果利用了$M$中$A$的强混合和渐进正交性质,并借鉴了S. Popa等人证明了:如果$G$是一个非交换自由群,且$a$是它的生成元之一,则由$a$生成的von Neumann代数在因子$L(G)$中是极大内射的.我们的结果适用于对$H<G$,其中$H$是一个无限阿贝尔子群的一个合适的合并产品组$G$。

英文摘要:

We present families of pairs of finite von Neumann algebras $A\subset M$ where $A$ is a maximal injective masa in the type $\mathrm{II}_1$ factor $M$ with separable predual. Our results make use of the strong mixing and the asymptotic orthogonality properties of $A$ in $M$ and are borrowed from ideas of S. Popa who proved that if $G$ is a non abelian free group and if $a$ is one of its generators, then the von Neumann algebra generated by $a$ is maximal injective in the factor $L(G)$. Our results apply to pairs $H<G$ where $H$ is an infinite abelian subgroup of a suitable amalgamated product group $G$.

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