### Ribbon homology cobordism

- Series
- Geometry Topology Seminar
- Time
- Monday, October 19, 2020 - 14:00 for 1 hour (actually 50 minutes)
- Location
- Speaker
- Shea Vela Vick – Louisiana State University – shea@math.lsu.edu

A cobordism between 3-manifolds is ribbon if it is built from handles of index no greater than 2. Such cobordisms arise naturally from several different topological and geometric contexts. In this talk, we discuss these objects and present a few obstructions to their existence, from Thurston geometries, character varieties, and instanton and Heegaard Floer homologies. This is joint work with Aliakbar Daemi, Tye Lidman, and Mike Wong.