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arXiv math/0608497math.AGmath.NT
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具正特征的Kuga-Satake阿贝尔簇

Kuga-Satake Abelian Varieties in Positive Characteristic

Jordan Rizov

摘要:

Kuga和Satake将每个极化复K3曲面(X,L)与一个复阿贝尔簇相关联,称为(X,L)的Kuga-Satake阿贝尔簇。我们使用这个构造来定义具有某些能级结构的极化K3曲面的模空间与C上具有水平结构的极化阿贝尔簇的模空间之间的态射。本文研究了这些态射。我们首先证明它们定义在Q的有限扩张上。然后我们证明了它们的正特性。用这种方法我们给出了任意基上Kuga-Satake阿贝尔簇的一个间接构造。我们也给出了一些应用程序,这种建设的正则升降机的普通K3曲面。

英文摘要:

Kuga and Satake associate with every polarized complex K3 surface (X,L) a complex abelian variety called the Kuga-Satake abelian variety of (X,L). We use this construction to define morphisms between moduli spaces of polarized K3 surface with certain level structures and moduli spaces of polarized abelian varieties with level structure over C. In this note we study these morphisms. We prove first that they are defined over finite extensions of Q. Then we show that they extend in positive characteristic. In this way we give an indirect construction of Kuga-Satake abelian varieties over an arbitrary base. We also give some applications of this construction to canonical lifts of ordinary K3 surfaces.

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