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Farber sequences of lattices

Farber sequences of lattices
Datum:

26.04.2018

Ort:

2.059 (20.30)

Referent:

Alessandro Carderi

Zeit:

15:45

Abstract: A sequence of lattices in a locally compact group G is said Farber if for every neighborhood of the identity U in G the proportion of conjugates of the lattices which intersect trivially U tends to 1. In this talk I will explain how one can use ultraproducts of actions of locally compact groups to obtain an easy proof that sequences of lattices whose covolume tends to infinity are automatically Farber for many property (T) groups for which the Nevo-Stuck-Zimmer theorem holds.