Topic: Gopakumar-Vafa type invariants for Calabi-Yau 4-folds
Speaker: Yalong Cao (Kavli IPMU, University of Tokyo)
Time: 16:00-17:30, Monday, March 20, 2017
Venue: Room 403, School of Mathematics, Guangzhou South Campus, SYSU

Abstract: 
As an analogy of Gopakumar-Vafa conjecture for CY 3-folds, Klemm-Pandharipande proposed GV type invariants on CY 4-folds using GW theory and conjectured their integrality. In this talk, we propose a sheaf theoretical interpretation to these invariants using Donaldson-Thomas theory on CY 4-folds. This is a joint work with Davesh Maulik and Yukinobu Toda.