崔沛仪 , 刁晗生 , 杜衡 , 胡悦科 , ‌李华杰 , 徐文强 , 徐斌 , 朱艺航

杨杰

2026年11月16日 10:00 至 11:00

Shuangqing-C654

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.