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arXiv · 1303.0549

Heights of Kudla-Rapoport divisors and derivatives of L-functions

Jan Hendrik Bruinier·Benjamin Howard·Tonghai Yang
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Abstract

We study special cycles on integral models of Shimura varieties associated with unitary similitude groups of signature (n-1,1). We construct an arithmetic theta lift from harmonic Maass forms of weight 2-n to the arithmetic Chow group of the integral model of a unitary Shimura variety, by associating to a harmonic Maass form f a linear combination of Kudla-Rapoport divisors, equipped with the Green function given by the regularized theta lift of f. Our main result is an equality of two complex numbers: (1) the height pairing of the arithmetic theta lift of f against a CM cycle, and (2) the central derivative of the convolution L-function of a weight n cusp form (depending on f) and the theta function of a positive definite hermitian lattice of rank n-1. When specialized to the case n=2, this result can be viewed as a variant of the Gross-Zagier formula for Shimura curves associated to unitary groups of signature (1,1). The proof relies on, among other things, a new method for computing improper arithmetic intersections.

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Jan Hendrik Bruinier, Benjamin Howard, Tonghai Yang. 2014-10-19. Heights of Kudla-Rapoport divisors and derivatives of L-functions. https://doi.org/10.1007/s00222-014-0545-9

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