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p -adic Differential Operators on Automorphic Forms on Unitary Groups

Ellen E. Eischen (2012)

Annales de l’institut Fourier

The goal of this paper is to study certain p -adic differential operators on automorphic forms on U ( n , n ) . These operators are a generalization to the higher-dimensional, vector-valued situation of the p -adic differential operators constructed for Hilbert modular forms by N. Katz. They are a generalization to the p -adic case of the C -differential operators first studied by H. Maass and later studied extensively by M. Harris and G. Shimura. The operators should be useful in the construction of certain p -adic...

Points rationnels sur les quotients d’Atkin-Lehner de courbes de Shimura de discriminant p q

Florence Gillibert (2013)

Annales de l’institut Fourier

Soient p et q deux nombres premiers distincts et X p q / w q le quotient de la courbe de Shimura de discriminant p q par l’involution d’Atkin-Lehner w q . Nous décrivons un moyen permettant de vérifier un critère de Parent et Yafaev en grande généralité pour prouver que si p et q satisfont des conditions de congruence explicites, connues comme les conditions du cas non ramifié de Ogg, et si p est assez grand par rapport à q , alors le quotient X p q / w q n’a pas de point rationnel non spécial.

Purity of level m stratifications

Marc-Hubert Nicole, Adrian Vasiu, Torsten Wedhorn (2010)

Annales scientifiques de l'École Normale Supérieure

Let k be a field of characteristic p > 0 . Let D m be a BT m over k (i.e., an m -truncated Barsotti–Tate group over k ). Let S be a k -scheme and let X be a BT m over S . Let S D m ( X ) be the subscheme of S which describes the locus where X is locally for the fppf topology isomorphic to D m . If p 5 , we show that S D m ( X ) is pure in S , i.e. the immersion S D m ( X ) S is affine. For p { 2 , 3 } , we prove purity if D m satisfies a certain technical property depending only on its p -torsion D m [ p ] . For p 5 , we apply the developed techniques to show that all level m ...

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