W∗-superrigidity of mixing Gaussian actions of rigid groups

W∗-superrigidity of mixing Gaussian actions of rigid groups
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W*-刚性群混合高斯作用的超刚性

DOI:
10.1016/j.aim.2013.05.012
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发表时间:
2012
影响因子:
1.7
通讯作者:
R. Boutonnet
R. Boutonnet
中科院分区:
数学1区
文献类型:
--
作者:
R. Boutonnet

文献摘要

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将刚性群的Bernoulli作用的W超刚性结果推广到一般的混合高斯作用.因此,我们得到以下结果:如果Γ是任何w-刚性的ICC群(即它包含具有相对性质(T)的无限正规子群),则任何混合高斯作用Γ <$X是W <$-超刚性的。更精确地说,如果Λ <$Y是另一个自由遍历作用,使得交叉积von Neumann代数是同构的L∞(X)<$Γ <$L∞(Y)<$<$Λ,则作用是共轭的。我们证明了一个类似的声明,每当Γ是一个不可接受的ICC产品的两个无限群。
We generalize W∗-superrigidity results about Bernoulli actions of rigid groups to general mixing Gaussian actions. We thus obtain the following: If Γ is any ICC group which is w-rigid (ie it contains an infinite normal subgroup with the relative property (T)) then any mixing Gaussian action Γ↷ X is W∗-superrigid. More precisely, if Λ↷ Y is another free ergodic action such that the crossed-product von Neumann algebras are isomorphic L∞(X)⋊ Γ≃ L∞(Y)⋊ Λ, then the actions are conjugate. We prove a similar statement whenever Γ is a non-amenable ICC product of two infinite groups.