Refined Vafa-Witten invariants for projective surfaces

Speaker:

Richard Thomas

Affiliation:

Imperial College London

Date:

Thu, 14/06/2018 - 10:30 - 12:00

Location:

MPIM Lecture Hall [2]

Parent event:

Seminar Algebraic Geometry (SAG) [3]

I'll describe how to define Vafa-Witten invariants -- and refined Vafa-Witten invariants -- of projective surfaces. Then I'll explain how to calculate some parts of the theory via degeneracy loci and "Carlsson-Okounkov operators". The talk describes different projects joint with Yuuji Tanaka, Davesh Maulik and Amin Gholampour.