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Integral canonical models for Spin Shimura varieties

Part of: Arithmetic algebraic geometry

Published online by Cambridge University Press:  07 December 2015

Keerthi Madapusi Pera
Keerthi Madapusi Pera*
Affiliation:
Department of Mathematics, 1 Oxford St, Harvard University, Cambridge, MA 02118, USA email keerthi@math.harvard.edu
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Abstract

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We construct regular integral canonical models for Shimura varieties attached to Spin and orthogonal groups at (possibly ramified) primes $p>2$ where the level is not divisible by $p$. We exhibit these models as schemes of ‘relative PEL type’ over integral canonical models of larger Spin Shimura varieties with good reduction at $p$. Work of Vasiu–Zink then shows that the classical Kuga–Satake construction extends over the integral models and that the integral models we construct are canonical in a very precise sense. Our results have applications to the Tate conjecture for K3 surfaces, as well as to Kudla’s program of relating intersection numbers of special cycles on orthogonal Shimura varieties to Fourier coefficients of modular forms.

Keywords

Shimura varietiesintegral canonical modelsSpin groups

MSC classification

Primary: 11G18: Arithmetic aspects of modular and Shimura varieties
Type
Research Article
Information
Compositio Mathematica , Volume 152 , Issue 4 , April 2016 , pp. 769 - 824
Copyright
© The Author 2015 

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