Some rigidity results for II1 factors arising from wreath products of property (T) groups
Some rigidity results for II1 factors arising from wreath products of property (T) groups
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由属性 (T) 组的花环积产生的 II1 因子的一些刚性结果
DOI:
10.1016/j.jfa.2019.108419
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发表时间:
2020
影响因子:
1.7
通讯作者:
Udrea, Bogdan Teodor
中科院分区:
文献类型:
--
作者:
Chifan, Ionut;Udrea, Bogdan Teodor
We show that any infinite collection (Γ n) n∈ N of icc, hyperbolic, property (T) groups satisfies the following von Neumann algebraic infinite product rigidity phenomenon. If Λ is an arbitrary group such that L (⊕ n∈ N Γ n)≅ L (Λ) then there exists an infinite direct sum decomposition Λ=(⊕ n∈ N Λ n)⊕ A with A icc amenable or trivial such that, for all n∈ N, up to amplifications, we have L (Γ n)≅ L (Λ n) and L (⊕ k≥ n Γ k)≅ L ((⊕ k≥ n Λ k)⊕ A). The result is sharp and complements the previous finite product rigidity property found in [16]. Using this we provide an uncountable family of restricted wreath products Γ≅ Σ≀ Δ of icc, property (T) groups Σ, Δ whose wreath product structure is recognizable, up to a normal amenable subgroup, from their von Neumann algebras L (Γ). Along the way we highlight several applications of these results to the study of rigidity in the C⁎-algebra setting.
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