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arXiv 2202.04788math.AG
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阿贝叶覆盖的Prym变种和Shimura变种的科

Families of Prym varieties of abelian coverings and Shimura varieties

Abolfazl Mohajer

摘要:

在Prym映射在特征$p$中内射的条件下,证明了由$¶^1$的交换覆盖族所产生的维数为$l$、极化型为$D$的交换簇的模空间中的特殊子簇$A_{l,D}$具有严格的限制性.换句话说,如果族是一维的,或者如果它包含纤维上同调的群作用的某种类型的本征空间,那么由这样的族产生的Shimura簇只能由族的群作用构造。

英文摘要:

Under the condition that the Prym map is injective in characteristic $p$, we prove that the special subvarieties in the moduli space of abelian varieties of dimension $l$ and polarization type $D$, $A_{l,D}$, arising from families of abelian covers of $¶^1$ are of a very restrictive nature. In other words, if the family is one-dimensional or if it contains an eigenspace of certain type for the group action on the cohomology of fibers, then the Shimura varieties arising from such families can only be constructed by the group action of the family.

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