SPS Journal Club: “Applications of categorical symmetries in two dimensions”

Strings, Pheno and the Swampland (SPS) Journal Club. Every Thursday at 12:00 in the Red Room.

Title: “Applications of categorical symmetries in two dimensions”

Venue & Time: Red Room / 12:00

Speaker:

Abstract: The goal of this talk is to give a quick overview of some of my recent work during the last years. I will begin with a lightning review of what generalised symmetries are and why it might be sensible
to relax the group multiplication structure. I will then discuss two applications:

1) In Non Linear Sigma Models, the presence of such symmetries protects some of the coupling constants from receiving any quantum corrections. From a target space point of view, this means some of the parameters of the background cannot receive \alpha’ corrections.

2) In systems of free chiral fermions, they give rise to the phenomenon of ‘twisted scattering’ (an incoming local operator that gets scattered into a point operator attached to a topological line), which help explain some long standing puzzles of the fermion-monopole scattering problem.