Organizers: Spencer Dowdall, Dan Margalit, Denis Osin

Time: Wednesdays, 4:10–5:00pm  

Location: SC 1432

Mailing List: If you would like to be added to the seminar mailing list and receive regular announcements, please contact one of the organizers.

Fall 2026

Wednesday, September 2

TBA

Wednesday, September 9

TBA

Wednesday, September 16

Noah Caplinger (University of Chicago)

Title: Groups acting on horocyclic products

Abstract:  Horocyclic products are a well-studied class of metric spaces that provide models for various solvable groups. Key examples include the universal cover of mapping tori of expanding maps or Anosov maps on nilmanifolds. Horocyclic products have played a key role in many quasi-isometric rigidity results in the past few decades. In this talk, I will give lots of examples of groups acting on horocyclic products and explain a theorem of mine and Daniel Levitin's, which says that essentially all examples of finitely presented groups acting on horocyclic products come from expanding or Anosov maps.

Host: Denis Osin

Wednesday, September 23

TBA

Wednesday, September 30

TBA

Wednesday, October 7

TBA

Wednesday, October 14

TBA

Wednesday, October 28

TBA

Wednesday, November 4

TBA

Wednesday, November 11

TBA

Wednesday, November 18

TBA

Wednesday, December 2

TBA

Spring 2027

Wednesday, January 20

TBA

Wednesday, January 27

TBA

Wednesday, February 3

TBA

Wednesday, February 10

TBA

Wednesday, February 17

TBA

Wednesday, February 24

TBA

Wednesday, March 3

TBA

Wednesday, March 10

TBA

Wednesday, March 24

TBA

Wednesday, March 31

TBA

Wednesday, April 7

TBA

Wednesday, April 14

TBA

Wednesday, April 21

TBA