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BIMSA-YMSC Tsinghua Number Theory Seminar
BIMSA-YMSC Tsinghua Number Theory Seminar
On semi-stable integral models for Shimura varieties
On semi-stable integral models for Shimura varieties
Organizers
Peiyi Cui
, Hansheng Diao
, Heng Du
, Yueke Hu
, Huajie Li
,
Max Wenqiang Xu
, Bin Xu
, Yihang Zhu
Speaker
Jie Yang
Time
Monday, November 16, 2026 10:00 AM - 11:00 AM
Venue
Shuangqing-C654
Abstract
We construct (potentially) semi-stable integral models for a class of Shimura varieties with maximal parahoric level at an odd prime. The main input is an explicit construction of semi-stable equivariant modifications of the relevant canonical local models, where the underlying groups are Weil restrictions of unramified unitary similitude groups, symplectic similitude groups, or even orthogonal similitude groups. Via the local model diagram, these constructions give (potentially) semi-stable integral models of the corresponding Shimura varieties. In particular, the resulting models are regular and have reduced special fiber with normal crossings. As an application, we deduce the unipotence of the inertia action on nearby cycles and the l-adic cohomology of the geometric generic fibers. This is joint work with Ioannis Zachos and Zhihao Zhao.