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arXiv 0812.3670math.AG
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关于素数Fano三重10次周期映射

On the period map for prime Fano threefolds of degree 10

O. Debarre, A. Iliev, L. Manivel

摘要:

我们证明了一个光滑的复杂的Fano三倍X皮卡德数为1,指数为1,度为10的变形,是通畅的。周期映射的微分具有二维核。我们构造了周期映射通过X的纤维的两个二维分支:一个是同构于X中的二次曲线簇,模对合,另一个是双有理同构于X上的半稳定秩2无挠层的模空间,模对合.对应于这些分量的点的三重通过圆锥和线(双有理)变换从X获得。

英文摘要:

We prove that the deformations of a smooth complex Fano threefold X with Picard number 1, index 1, and degree 10, are unobstructed. The differential of the period map has two-dimensional kernel. We construct two two-dimensional components of the fiber of the period map through X: one is isomorphic to the variety of conics in X, modulo an involution, another is birationally isomorphic to a moduli space of semistable rank-2 torsion-free sheaves on X, modulo an involution. The threefolds corresponding to points of these components are obtained from X via conic and line (birational) transformations.

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