A new model for the theta divisor of the cubic threefold

Details A new model for the theta divisor of the cubic threefold A new model for the theta divisor of the cubic threefold

2004-03-15

arxiv.org/abs/math/0403245v1

Mathematics

Algebraic Geometry

Scientific paper

In this paper we give a birational model for the theta divisor of the intermediate Jacobian of a generic cubic threefold $X$. We use the standard realization of $X$ as a conic bundle and a $4-$dimensional family of plane quartics which are totally tangent to the discriminant quintic curve of such a conic bundle structure. The additional data of an even theta characteristic on the curves in the family gives us a model for the theta divisor.

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