[Binghamton Geometry Topology Seminar] (no subject)

[Cary Malkiewich]

Hi everyone,

A quick reminder about the seminar and coffee hour today. See you there!

On Mon, May 3, 2021 at 10:54 AM Matthew R Haulmark <haulmark at binghamton.edu>
wrote:

> Hi everyone,
>
> This week our speaker will be Wouter Van Limbeek from the University of
> Illinois-Chicago. Here are the details.
>
> *Title: *Do thin groups have discrete commensurators?
>
> *Abstract: *Let G be a simple Lie group and \Gamma < G a lattice. In
> 1974, Margulis proved that if the commensurator of \Gamma is dense, then
> \Gamma is arithmetic. In 2015, Shalom asked if the same is true only
> assuming \Gamma is Zariski-dense in G. I will report on recent progress on
> this question for normal subgroups of lattices in rank 1 (e.g. hyperbolic
> space) using ideas from infinite ergodic theory, Brownian motion, random
> walks and harmonic maps. I will attempt to give a picture of how all these
> ideas combine to give information on commensurators. This is joint work
> with D. Fisher and M. Mj.
>
>
> Zoom link for the seminar, 2:50 - 3:50:
> https://binghamton.zoom.us/j/94057178271
>
> Zoom link for the coffee, 12:30 - 1:30:
> https://binghamton.zoom.us/j/96674397432
>
> Best,
>
> Matt
> _______________________________________________
> Seminar web page:
> http://www2.math.binghamton.edu/p/seminars/topsem
> topsem mailing list:
> http://www1.math.binghamton.edu/mailman/listinfo/topsem
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