Von Neumann algebras of sofic groups with β(2)1=0 are strongly 1-bounded

Von Neumann algebras of sofic groups with β(2)1=0 are strongly 1-bounded
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β(2)1=0 的 sofic 群的冯诺依曼代数是强 1 有界的

DOI:
10.7900/jot.2019oct21.2270
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发表时间:
2016
影响因子:
0.8
通讯作者:
D. Shlyakhtenko
D. Shlyakhtenko
中科院分区:
数学2区
文献类型:
--
作者:
D. Shlyakhtenko

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证明了:如果Γ是一个第一L2-Betti数为零的生成的可表示sofic群,则vonNeumann代数L(Γ)在Jung意义下是强1-有界的.特别地,如果Λ是自由熵维数>1的任何群,例如自由群,则L(r)<$L(Λ)。关键的技术结果是一个简短的证明荣格的估计
We show that if Γ is a finitely generated finitely presented sofic group with zero first L2-Betti number, then the von Neumann algebra L(Γ) is strongly 1-bounded in the sense of Jung. In particular, L(Γ)≆L(Λ) if Λ is any group with free entropy dimension >1, for example a free group. The key technical result is a short proof of an estimate of Jung