Geometry Seminar
Winter 2021
Thursdays (and sometimes Tuesdays) 3:40-4:30pm, in
Ryerson 358 (currently on zoom)
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- Thursday January 21 at 3:40-4:30pm in Zoom
- Kevin Schreve, University of Chicago
- Invariant random subgroups
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Abstract: This talk is intended to provide some
background for Mikolaj Fraczyk's talk next week. I will
introduce the Chabauty topology, Benjamini-Schramm
convergence, and invariant random subgroups.
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- Thursday January 28 at 3:40-4:30pm in Zoom
- Mikolaj Fraczyk, University of Chicago
- Injectivity radius of discrete subgroups of higher rank groups
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Abstract: Let G be a simple higher rank Lie group
and let X be the associated symmetric space. Margulis
conjectured that any discrete subgroup Gamma of G such that
X/Gamma has uniformly bounded injectivity radius must be a
lattice. I will present the proof of this conjecture and
explain how stationary random subgroups play the central
role in the argument. The talk will be based on a recent
joint work with Tsachik Gelander.
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- Thursday February 4 at 3:40-4:30pm in Zoom
- Kasia Jankiewicz, University of Chicago
- TBA
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Abstract: TBA
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- Thursday February 11 at 3:40-4:30pm in Zoom
- Alexander Olshanskiy, Vanderbilt University
- TBA
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Abstract: TBA
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- Thursday February 18 at 3:40-4:30pm in Zoom
- Danny Calegari, University of Chicago
- TBA
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Abstract: TBA
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- Thursday February 25 at 3:40-4:30pm in Zoom
- Daniil Rudenko, University of Chicago
- TBA
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Abstract: TBA
Due to the high number of requests, we are no longer accepting speakers via self-invitations.
For questions, contact