Number Theory Seminar

Fall 2026: Thursday 1:30-2:30 PM (Pretalk at 10:00-11:30 AM)

Location: (Zhihua Building, Wang Xuan Seminar Room) 智华楼，王选报告厅

Click on "Toggle Abstract" to view or hide the abstract for each scheduled talk.

Schedule

Date	Speaker	Topic
September 10	Jack Sempliner (UCLA)	On a cohomological Jacquet-Langlands correspondence for Shimura varieties (Toggle abstract) Pretalk by Peihang Wu on Introduction to Shimura varieties and Igusa varieties
We will discuss a new result on the p-adic geometry of Igusa stacks, which allows one to relate the p-adic geometry of Shimura varieties for a pair of groups $G, G'$ which are global extended pure inner forms. Using this geometric input and the spectral action of Fargues-Scholze, we will discuss how this input may be used to prove the existence of Hecke-equivariant cohomological "Jacquet-Langlands" maps between the cohomology (even with integral or torsion coefficients) of the two Shimura varieties of abelian type associated to $G, G'$. Pretalk at 10:00-11:30, by Peihang Wu on Introduction to Shimura varieties and Igusa varieties Outline of the pretalk: We will briefly discuss Shimura varieties by examples, and explain what Igusa varieties are, again by examples.
September 17	TBD	TBD (Toggle Abstract)
Abstract to be announced.
September 24	TBD	TBD (Toggle Abstract)
Abstract to be announced.
October 1 and 8	No speakers	National Day Holiday - No seminars this week
October 15	TBD	TBD (Toggle Abstract)
Abstract to be announced.
October 22	TBD	TBD (Toggle Abstract)
Abstract to be announced.
October 29	TBD	TBD (Toggle Abstract)
Abstract to be announced.
November 5	TBD	TBD (Toggle Abstract)
Abstract to be announced.
November 12	TBD	TBD (Toggle Abstract)
Abstract to be announced.
November 19	TBD	TBD (Toggle Abstract)
Abstract to be announced.
November 26	TBD	TBD (Toggle Abstract)
Abstract to be announced.
December 3	TBD	TBD (Toggle Abstract)
Abstract to be announced.
December 10	TBD	TBD (Toggle Abstract)
Abstract to be announced.
December 17	TBD	TBD (Toggle Abstract)
Abstract to be announced.

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Liang Xiao

Beijing International Center for Mathematical Research, Peking University

Number Theory Seminar

Fall 2026: Thursday 1:30-2:30 PM (Pretalk at 10:00-11:30 AM)

Schedule