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arXiv 1502.02723math.AG
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极化Enriques曲面的模量

Moduli of polarized Enriques surfaces

Valery Gritsenko, Klaus Hulek

摘要:

本文研究了极化和数值极化Enriques曲面的模空间。数值极化Enriques曲面的模空间可以描述为10维正交模簇的开子集。我们的描述的后果之一是,只有100多个同构类的模空间的极化和数值极化的恩里克斯曲面。我们使用模形式证明了一些小的程度,Kodaira尺寸的模空间的数值极化恩里克表面是负的。最后证明了存在无穷多个极化子,使得数值极化Enriques曲面的模空间与具有2阶结构的非极化Enriques曲面的模空间是双有理的.

英文摘要:

In this paper we consider moduli spaces of polarized and numerically polarized Enriques surfaces. The moduli spaces of numerically polarized Enriques surfaces can be described as open subsets of orthogonal modular varieties of dimension 10. One of the consequences of our description is that there are only finitely many isomorphism classes of moduli spaces of polarized and numerically polarized Enriques surfaces. We use modular forms to prove for a number of small degrees that the Kodaira dimension of the moduli space of numerically polarized Enriques surfaces is negative. Finally we prove that there are infinitely many polarizatons for which the moduli space of numerically polarized Enriques surfaces is birational to the moduli space of unpolarized Enriques surfaces with a level 2 structure.

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