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arXiv 0807.2030math.GR
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局部紧群的闭子群空间

Spaces of closed subgroups of locally compact groups

Pierre de la Harpe

摘要:

局部紧群$G$的闭子群的集合$\Cal C(G)$有一个自然拓扑,使它成为一个紧空间。这种拓扑结构已被定义在各种情况下的Vietoris,Chabauty,费尔,瑟斯顿,格罗莫夫,Grigorchuk,和许多其他人。谈话的目的是描述空间$\Cal C(G)$首先为几个基本的例子,然后为$G$复平面,在这种情况下,$\Cal C(G)$是一个4-球(一个结果的哈伯德和Pourezza),最后为3-维海森堡群$H$,在这种情况下,$\Cal C(H)$是一个6-维奇异空间最近调查马丁布赖森,维克多Kleptsyn和作者\cite{BrHK}。这些是为几个地方的演讲准备的略有扩展的笔记:2008年5月26- 30日的Kortrijk { \it离散群和几何结构及其应用III}研讨会; 2008年6月13日的里昂高等师范学校{ \it Tripode 14};以及洛桑洛桑联邦理工学院和雷恩第一大学的研讨会。注释不包含除\cite{BrHK}中的结果外的任何其他结果,并且不打算用于出版。

英文摘要:

The set $\Cal C(G)$ of closed subgroups of a locally compact group $G$ has a natural topology which makes it a compact space. This topology has been defined in various contexts by Vietoris, Chabauty, Fell, Thurston, Gromov, Grigorchuk, and many others. The purpose of the talk was to describe the space $\Cal C(G)$ first for a few elementary examples, then for $G$ the complex plane, in which case $\Cal C(G)$ is a 4--sphere (a result of Hubbard and Pourezza), and finally for the 3--dimensional Heisenberg group $H$, in which case $\Cal C(H)$ is a 6--dimensional singular space recently investigated by Martin Bridson, Victor Kleptsyn and the author \cite{BrHK}. These are slightly expanded notes prepared for a talk given at several places: the Kortrijk workshop on {\it Discrete Groups and Geometric Structures, with Applications III,} May 26--30, 2008; the {\it Tripode 14,} École Normale Supérieure de Lyon, June 13, 2008; and seminars at the EPFL, Lausanne, and in the Université de Rennes 1. The notes do not contain any other result than those in \cite{BrHK}, and are not intended for publication.

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