中文

由双曲群任意作用产生的II_1因子的唯一Cartan分解

算子代数 2014-09-15 v3 动力系统 群论

摘要

我们证明,对于非初等双曲群或秩一单李群中格点的任意自由遍历保测度作用Γ\actson(X,μ)\Gamma \actson (X,\mu),相应的群测度空间II_1因子L(X)ΓL^\infty(X) \rtimes \Gamma在酉共轭意义下具有唯一的Cartan子代数L(X)L^\infty(X)

关键词

引用

@article{arxiv.1201.2824,
  title  = {Unique Cartan decomposition for II_1 factors arising from arbitrary actions of hyperbolic groups},
  author = {Sorin Popa and Stefaan Vaes},
  journal= {arXiv preprint arXiv:1201.2824},
  year   = {2014}
}

备注

v3: Considerably simplified proof of the main result. v2: Improved exposition; new result proving uniqueness of Cartan for crossed products by irreducible lattices in products of rank one Lie groups