中文

关于 $C^*$-单群作用的居中 $C^*$-子代数

算子代数 2019-02-08 v2

摘要

我们证明对于一大类 CC^*-单群 Γ\Gamma 在单位 CC^*-代数 A\mathcal{A} 上的作用 ΓA\Gamma \curvearrowright \mathcal{A}(包括具有平凡顺从根的双曲群的任何不忠实作用),每一个居中 CC^*-子代数 B\mathcal{B}Cλ(Γ)BArΓC_{\lambda}^*(\Gamma)\subseteq \mathcal{B} \subseteq \mathcal{A}\rtimes_{r}\Gamma,都具有形式 A1rΓ\mathcal{A}_1\rtimes_{r}\Gamma,其中 A1\mathcal{A}_1A\mathcal{A} 的单位 Γ\Gamma-CC^*-子代数。

关键词

引用

@article{arxiv.1811.11381,
  title  = {On Intermediate $C^*$-subalgebras of $C^*$-simple Group Actions},
  author = {Tattwamasi Amrutam},
  journal= {arXiv preprint arXiv:1811.11381},
  year   = {2019}
}

备注

We have added more examples of plump subgroups, in particular showed that every non-elementary subgroup of a non-torsion convergence group is plump. We have also proved a similar result in von Neumann algebraic setting. This version also includes an appendix with Yongle Jiang containing an example of a faithful action of a $C^*$-simple group, for which every intermediate $C^*$-algebra splits