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arXiv 1012.4242math.AG
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三次曲面的重覆盖沿其Hessian分支

The double cover of cubic surfaces branched along their Hessian

Atsushi Ikeda

摘要:

证明了非奇异三次曲面沿其Hessian分支的双覆盖的Hodge结构与沿三次曲面分支的周围射影空间的三覆盖的Hodge结构之间的关系.并介绍了一种研究三次曲面的二重覆盖的Hodge结构的无穷小变分的方法。利用这些结果,我们计算了一般三次曲面和Fermat三次曲面的双重覆盖的Néron-Severi格.

英文摘要:

We prove the relation between the Hodge structure of the double cover of a nonsingular cubic surface branched along its Hessian and the Hodge structure of the triple cover of the ambient projective space branched along the cubic surface. And we introduce a method to study the infinitesimal variations of Hodge structure of the double cover of the cubic surface. Using these results, we compute the Néron-Severi lattices for the double cover of a generic cubic surface and the Fermat cubic surface.

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