Relevement de formes modulaires de Siegel

Details Relevement de formes modulaires de Siegel Relevement de formes modulaires de Siegel

2008-12-17

arxiv.org/abs/0812.3231v3

Mathematics

Number Theory

Scientific paper

Dans cette note, nous montrons que certaines formes modulaires de Siegel de caract\'eristique p et de genre 2 ou 3 se rel\`event en caract\'eristique 0. Ce r\'esultat g\'en\'eralise un th\'eor\`eme classique obtenu par Katz pour les formes de genre 1. Nous utilisons des r\'esultats de Shepherd-Barron et de Hulek et Sankaran, ainsi que des th\'eor\`emes d'annulation de la cohomologie coh\'erente d\^us \`a Deligne, Illusie et Raynaud et \`a Esnault et Viehweg. ----- In this note, we show that cuspidal Siegel modular forms of characteristic p and genus 2 or 3 can be lifted to characteristic 0. This result extends a classical theorem proved by Katz for genus 1 modular forms. We use ampleness results due to Shepherd-Barron, Hulek and Sankaran, and vanishing theorems due to Deligne, Illusie, Raynaud, Esnault and Viehweg.

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