Speaker: Lei Chen
University of Maryland
Will give a Topology Seminar entitled:
Mapping class groups of circle bundles over a surface
Abstract: In this talk, we study the algebraic structure of mapping class group Mod(M) of 3-manifolds M that fiber as a circle bundle over a surface. We prove an exact sequence, relate this to the Birman exact sequence, and determine when this sequence splits. We will also discuss the Nielsen realization problem for such manifolds and give a partial answer. This is joint work with Bena Tshishiku and Alina Beaini.
Date: 04-02-2024
Time: 2:30 pm
Location: 258 Hurley Bldg