Weak Notions of Normality and Vanishing up to Rank in L2-Cohomology

Weak Notions of Normality and Vanishing up to Rank in L2-Cohomology
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DOI:
10.1093/imrn/rnt029
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发表时间:
2012-06
影响因子:
1
通讯作者:
U. Bader;A. Furman;Roman Sauer
U. Bader;A. Furman;Roman Sauer
中科院分区:
数学1区
文献类型:
--
作者:
U. Bader;A. Furman;Roman Sauer

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我们研究在满足某些弱正态性条件的子群存在的情况下可数群的 L 2 -上同调的消失结果。因此,我们证明任何无限积分域 R 的 SLn(R) 的 L 2 -Betti 数在 n 1 次以下消失。另一个应用是 Thompson 群 F 和 T 的所有 L2-Betti 数的消失。
We study vanishing results for L 2 -cohomology of countable groups under the presence of subgroups that satisfy some weak normality condition. As a consequence we show that the L 2 -Betti numbers of SLn(R) for any infinite integral domain R vanish below degree n 1. Another application is the vanishing of all L2-Betti numbers for Thompson's groups F and T.