Organizers: Lin Chen, Will Donovan, Penghui Li, Henry Liu, Peng Shan, Changjian Su, Wenbin Yan, Qixian Zhao

Time:  Friday, 3:30 pm -- 4:30 pm

Place: C654, Shuangqing Complex Building（双清综合楼C654教室), Yau Mathematical Sciences Center,  Tsinghua University

双清综合楼地址：北京市海淀区逸清南路西延6号院1号，双清公寓马路对面、清华附小（双清校区）西侧。

official seminar webpage,  which contains the zoom information for online talks

• 09/18 Henry Liu (YMSC)

A blow-up formula for Vafa-Witten theory

I will explain how to use 3-Calabi-Yau wall-crossing techniques to obtain a relationship between the refined Vafa-Witten partition functions (in the sense of Tanaka and Thomas) of a smooth projective surface vs. its blow-up at a point. This is a powerful constraint on the structure of Vafa-Witten partition functions. Previously, such blow-up formulas were only proven for the so-called "instanton branch" where the Higgs field is zero.

• 09/25

• 10/09

• 10/16

• 10/23 Alyosha Latyntsev (Bimsa)

• 10/30 Yukinobu Toda (Kavli IPMU)

• 11/06

• 11/13

• 11/20

• 11/27

• 12/04

• 12/11

• 12/18

• 12/25

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seminar arxiv: 2026 Spring, 2025 Fall, 2025 Spring, 2024 Fall, 2024 Spring, 2023 Fall, 2023 Spring, 2022 Fall, official page