Algebra Seminar

Title: The measurable Kesten theorem
Speaker: Miklos Abert
Speaker Info:
Brief Description:
Special Note:

Let Gamma be a finitely generated group and N be a normal subgroup. Kesten's theorem (essentially his thesis) says that a random walk of Gamma sees N with exponentially larger probability than it sees the identity, if and only if N is a non-amenable group. It is easy to see that this theorem is false when one omits the normality condition. In the talk I will extend Kesten's result in the measurable setting and show what this implies on the geometry of Ramanujan graphs. This is joint work with Yair Glasner and Balint Virag.
Date: Wednesday, December 5, 2012
Time: 2:00pm
Where: Lunt 104
Contact Person: Nir Avni
Contact email: nir@math.northwester.edu
Contact Phone:
Copyright © 1997-2024 Department of Mathematics, Northwestern University.