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Unitary cycles on Shimura curves and the Shimura lift II

Part of: Discontinuous groups and automorphic forms Arithmetic problems. Diophantine geometry Arithmetic algebraic geometry

Published online by Cambridge University Press:  15 September 2014

Siddarth Sankaran
Siddarth Sankaran*
Affiliation:
Mathematisches Institut der Universität Bonn, Endenicher Allee 60, 53115 Bonn, Germany email [email protected]
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Abstract

We consider two families of arithmetic divisors defined on integral models of Shimura curves. The first was studied by Kudla, Rapoport and Yang, who proved that if one assembles these divisors in a formal generating series, one obtains the $q$-expansion of a modular form of weight 3/2. The present work concerns the Shimura lift of this modular form: we identify the Shimura lift with a generating series comprising divisors arising in the recent work of Kudla and Rapoport regarding cycles on Shimura varieties of unitary type. In the prequel to this paper, the author considered the geometry of the two families of cycles. These results are combined with the Archimedean calculations found in this work in order to establish the theorem. In particular, we obtain new examples of modular generating series whose coefficients lie in arithmetic Chow groups of Shimura varieties.

Keywords

Shimura curvesspecial cyclesArakelov geometrymodular formsShimura lift

MSC classification

Primary: 11G18: Arithmetic aspects of modular and Shimura varieties 14G40: Arithmetic varieties and schemes; Arakelov theory; heights 11F30: Fourier coefficients of automorphic forms
Type
Research Article
Information
Compositio Mathematica , Volume 150 , Issue 12 , December 2014 , pp. 1963 - 2002
Copyright
© The Author 2014 

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