Allosteric actions of surface groups

  • Date:


  • Speaker:

    Matthieu Joseph

  • Time:

    16:00 - 17:30

  • Abstract

    In a recent work, I introduced the notion of allosteric actions: a minimal action of a countable group on a compact space, with an ergodic invariant measure, is allosteric if it is topologically free but not essentially free. In the first part of my talk I will explain some properties of allosteric actions, and their link with Invariant Random Subgroups (IRS) and Uniformly Recurrent Subgroups (URS). In the second part, I will explain a recent result of mine: the fundamental group of a closed hyperbolic surface admits allosteric actions. 


  • Place:

    20.30 SR 2.058