Intersection theory on Shimura surfaces

Details Intersection theory on Shimura surfaces Intersection theory on Shimura surfaces

2012-02-28

arxiv.org/abs/1202.6378v1

Compos. Math. 145, No. 2 (2009), 423-475

Mathematics

Number Theory

Scientific paper

Kudla has proposed a general program to relate arithmetic intersection multiplicities of special cycles on Shimura varieties to Fourier coefficients of Eisenstein series. The lowest dimensional case, in which one intersects two codimension one cycles on the integral model of a Shimura curve, has been completed by Kudla-Rapoport-Yang. In the present paper we prove results in a higher dimensional setting. On the integral model of a Shimura surface we consider the intersection of a Shimura curve with a codimension two cycle of complex multiplication points, and relate the intersection to certain cycles classes constructed by Kudla-Rapoport-Yang. As a corollary we deduce that our intersection multiplicities appear as Fourier coefficients of a Hilbert modular form of half-integral weight.

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