Uniformly recurrent subgroups

Eli Glasner, Benjamin Weiss

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

33 Scopus citations

Abstract

We define the notion of uniformly recurrent subgroup, URS in short, which is a topological analog of the notion of invariant random subgroup (IRS), introduced in Abert, Glasner, and Virag (2014). Our main results are as follows. (i) It was shown in Weiss (2012) that for an arbitrary countable infinite group G, any free ergodic probability measure preserving G-system admits a minimal model. In contrast we show here, using URS’s, that for the lamplighter group there is an ergodic measure preserving action which does not admit a minimal model. (ii) For an arbitrary countable group G, every URS can be realized as the stability system of some topologically transitive G-system.

Original languageEnglish
Title of host publicationContemporary Mathematics
PublisherAmerican Mathematical Society
Pages63-75
Number of pages13
DOIs
StatePublished - 2015

Publication series

NameContemporary Mathematics
Volume631
ISSN (Print)0271-4132
ISSN (Electronic)1098-3627

Keywords

  • Essentially free action
  • Free group
  • IRS
  • Invariant minimal subgroups
  • Stability group
  • Stability system
  • URS

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