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愛知数論セミナー

第一講演: 14:30 〜 15:30

講演者: 南 範彦 氏  (大和大学理工学部数理科学専攻, OCAMI)

講演題目:サイクル写像とその仲間たちから得られる,高次余次元双有理不変量

講演概要: 

25-0208_minami_abstract.pdf

第二講演: 15:45 〜 16:45

講演者: Joseph Muller 氏  (東京大学大学院数理科学研究科)

講演題目:Nearby cycles of the PEL GU(1,n-1) Shimura variety over a ramified prime

講演概要:Shimura varieties associated to groups of unitary similitudes have a classical description as moduli spaces of polarized abelian varieties with extra structures. In the case of signature (1,n-1), Pappas built a flat integral model of this Shimura variety over primes which ramify in the reflex field. This model has isolated singularities located inside the special fiber. In this talk, I will explain how to compute the cohomology sheaves of the l-adic nearby cycles complex of this integral model. Our computations rely on Krämer's explicit description of the local model and of its blow-up at the singular points. Since the blow-up has semi-stable reduction, the nearby cycles can now be computed by proper base change.  

会場

名古屋大学 多元数理科学棟 109教室

住所:〒464-8602 愛知県名古屋市千種区不老町

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