L2-invisibility and a class of local similarity groups

  • Datum:

    18.04.2013

  • Referent:

    Werner Thumann 

  • Zeit:

    14:00 Uhr

  • In this talk we present a certain class of local similarity groups which are L^2-invisible, i.e. the (non-reduced) group homology of the regular unitary representation vanishes in all degrees. This class contains groups of type FP_\infty, e.g. Thompson's group V and Nekrashevych-Röver groups. They yield counterexamples to a generalized zero-in-the-spectrum conjecture for groups of type FP_\infty. This is joint work with Roman Sauer. 
  • Ort:

    Raum 1C-04 
    im Allianzgebäude (05.20)