Topology and Geometric Group Theory Seminars at the Ohio State University

Aug 27 -

Sep 1 - 

Sep 3 - Francesco Lin (Columbia)

Adjunction inequalities and the Davis hyperbolic four-manifold

LeBrun conjectured that the Seiberg-Witten invariants of closed hyperbolic four-manifolds vanish. After discussing context and consequences, I will provide an overview of what is known, and then focus on the proof (joint work with Bruno Martelli) that the conjecture holds for the Davis manifold.

Sep 8 - 

Sep 10 - Yu-Chan Chang (OSU)

Isomorphism Problems for Bestvina--Brady Groups

Bestvina--Brady groups are subgroups of right-angled Artin groups, and both families of groups are defined on finite simple graphs. This talk will address two isomorphism problems concerning Bestvina--Brady groups. Specifically, I will discuss how that tree spanners and matroids come into play when answering these questions. This is joint work with Lorenzo Ruffoni.

Sep 15 - 

Sep 17 - Maya Verma (OSU)

Torsion-free lattices in Baumslag-Solitar complexes 

For the Cayley 2-complex X_{m,n}​ of a Baumslag-Solitar group BS(m,n), one can consider the group of combinatorial automorphisms, denoted Aut(X_{m,n}​). In this talk, we explore torsion-free uniform lattices in the locally compact group Aut(X_{m,n}​). We classify the pairs of nonzero integers (m,n) for which Aut(X_{m,n}​) contains torsion-free incommensurable lattices.

Sep 22 - 

Sep 24 - Yukun Du (University of Georgia)

Sep 29 - 

Oct 1 -

Oct 6 -

Oct 8 - Zhihao Mu (CUNY)

Oct 13 - Chloé Postel-Vinay (U Chicago)

Oct 15 - Autumn Break

Oct 20 - 

Oct 22 - Matt Zaremsky (SUNY Albany)

Oct 27 - Meenakshy Jyothis (U of Oklahoma)

Oct 29 - 

Nov 3 - 

Nov 5 - Emily Stark (Wesleyan)

Nov 10 - 

Nov 12 - Christopher Cericola (Oregon State)

Nov 17 - Rado Lectures

Nov 19 - 

Nov 24 - Amy Tao (UW-Madison)

Nov 26 - Thanksgiving break

Dec 1 - 

Dec 3 - 

Dec 8 -