Ramification of nearby cycles over a geometric base

Time：Mon., 10:00- 11:00 am, Oct. 20, 2025

Venue：B627, Shuangqing Complex Building A

Organizer：Hansheng Diao, Heng Du, Yueke Hu, Bin Xu, Yihang Zhu

Speaker：Haoyu Hu

BIMSA-YMSC Tsinghua Number Theory Seminar

Organizers：

Hansheng Diao, Heng Du, Yueke Hu, Bin Xu, Yihang Zhu

Speaker：

Haoyu Hu

Nanjing University

Time：

Mon., 10:00- 11:00 am, Oct. 20, 2025

Venue：

B627, Shuangqing Complex Building A

Title:

Ramification of nearby cycles over a geometric base

Abstract:

In this talk, we discuss a ramification bound of nearby cycle complexes for étale sheaves over a DVR base of equal characteristic with imperfect residue field. We also explain an application of the boundedness result to Betti numbers of étale sheaves on affine spaces. This is a joint work with Jean-Baptiste Teyssier.

DATEOctober 19, 2025

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