Remote Nordic HET seminar: Matthew Buican

Speaker: Matthew Buican

Title: aXb=c in 2+1D TQFT

Abstract: I will start by giving a gentle introduction to 2+1D topological quantum field theory (TQFT), the fusion of line operators in these theories, and how 1-form symmetry arises. I will then discuss recent work in which we study fusions that are, in a sense I will explain, generalizations of 1-form symmetry and reveal much about global properties of TQFT. I will illustrate the discussion with various examples from 2+1D discrete gauge theories to Chern-Simons theories with continuous gauge groups and mention various open problems.