Lattice Polarized K3 Surfaces and Siegel Modular Forms

Details Lattice Polarized K3 Surfaces and Siegel Modular Forms Lattice Polarized K3 Surfaces and Siegel Modular Forms

2010-04-20

arxiv.org/abs/1004.3503v1

Mathematics

Algebraic Geometry

Scientific paper

The goal of the present paper is two-fold. First, we present a classification of algebraic K3 surfaces polarized by the lattice H+E_8+E_7. Key ingredients for this classification are: a normal form for these lattice polarized K3 surfaces, a coarse moduli space and an explicit description of the inverse period map in terms of Siegel modular forms. Second, we give explicit formulas for a Hodge correspondence that relates these K3 surfaces to principally polarized abelian surfaces. The Hodge correspondence in question underlies a geometric two-isogeny of K3 surfaces.

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