Gauss Composition for P^1, and the universal Jacobian of the Hurwitz space of double covers

Details Gauss Composition for P^1, and the universal Jacobian of the Hurwitz space of double covers Gauss Composition for P^1, and the universal Jacobian of the Hurwitz space of double covers

2011-11-02

arxiv.org/abs/1111.0498v1

Mathematics

Algebraic Geometry

32 pages, 4 figures

Scientific paper

We investigate the universal Jacobian of degree n line bundles over the Hurwitz stack of double covers of P^1 by a curve of genus g. Our main results are: the construction of a smooth, irreducible, universally closed (but not separated) moduli compactification of this universal Jacobian; a description of the global geometry and moduli properties of these stacks; and a computation of the Picard groups of these stacks in the cases when n-g is even. An important ingredient of our work is the parametrization of line bundles on double covers by binary quadratic forms. This parametrization generalizes the classical number theoretic correspondence between ideal classes of quadratic rings and integral binary quadratic forms, which in particular gives the group law on integral binary quadratic forms first discovered by Gauss.

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