On Shimura curves in the Schottky locus

Details On Shimura curves in the Schottky locus On Shimura curves in the Schottky locus

2007-05-30

arxiv.org/abs/0705.4432v2

Mathematics

Algebraic Geometry

23 pages, shortened version of my PhD thesis

Scientific paper

We show that a given rational Shimura curve Y with strictly maximal Higgs field in the moduli space of g-dimensional abelian varieties does not generically intersect the Schottky locus for large g. We achieve this by using a result of Viehweg and Zuo which says that if Y parameterizes a family of curves of genus g, then the corresponding family of Jacobians is isogenous over Y to the g-fold product of a modular family of elliptic curves. After reducing the situation from the field of complex numbers to a finite field, we will see, combining the Weil and Sato-Tate conjectures, that this is impossible for large genus g.

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