A new model for the theta divisor of the cubic threefold

A new model for the theta divisor of the cubic threefold
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三次三次θ除数的新模型

DOI:
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发表时间:
2004
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通讯作者:
M. Pacini
M. Pacini
中科院分区:
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文献类型:
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作者:
M. Artebani;R. Kloosterman;M. Pacini

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本文给出了一般三次三重X的中间Jacobian的θ因子的双有理模型。我们使用X的标准实现作为一个圆锥丛和一个四维平面四次曲线族,这些平面四次曲线族与这样一个圆锥丛结构的判别五次曲线完全相切。该系列曲线上的偶数θ特性的附加数据为我们提供了θ因子的模型。
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.