Starts 16 Feb 2022 16:00
Ends 16 Feb 2022 17:00
Central European Time
Leonardo Building - Luigi Stasi Seminar Room
Please Register in advance for this meeting:
After registering, you will receive a confirmation email containing information about joining the meeting.

ICTP Leonardo Da Vinci Building - Budinich Lecture Hall (only if provided with a green pass)

Abstract: In the last lecture we introduced moduli spaces of sheaves on surface and then defined perfect obstruction theories and virtual invariants. We start this lecture by applying this to define the virtual Euler numbers of moduli spaces of sheaves, and their refinement by the virtual chi_y-genus. We will then introduce the moduli space of Higgs pairs and use it to define Vafa-Witten invariants. This also requires a review of localization and virtual localization with respect to $C^*$-actions.
This will be a hybrid seminar. All are very welcome to join either online or in person (if provided with a green pass). Venue: Luigi Stasi seminar room, for those wishing to attend in person.