arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.0973math.AG
收藏

通过伽罗瓦覆盖在Torelli轨迹上的Shimura簇

Shimura varieties in the Torelli locus via Galois coverings

Paola Frediani, Alessandro Ghigi, Matteo Penegini

摘要:

给出了一个简单的充分条件,保证了一族射影线的Galois覆盖的象通过周期映射的闭包是A_g中的特殊(或Shimura)子簇.通过计算机程序得到了满足条件的8个属内所有科的列表。8属中无科,全部为7属。这些例子与奥尔特的一个猜想有关。其中我们得到了由不同作者(Shimura,Mostow,De Jong-Noot,Rohde,Moonen等)构造的循环例子和Moonen-Oort发现的交换非循环例子。我们得到了7个新的非阿贝尔例子。

英文摘要:

Given a family of Galois coverings of the projective line we give a simple sufficient condition ensuring that the closure of the image of the family via the period mapping is a special (or Shimura) subvariety in A_g. By a computer program we get the list of all families in genus up to 8 satisfying our condition. There is no family in genus 8, all of them are in genus at most 7. These examples are related to a conjecture of Oort. Among them we get the cyclic examples constructed by various authors (Shimura, Mostow, De Jong-Noot, Rohde, Moonen and others) and the abelian non-cyclic examples found by Moonen-Oort. We get 7 new non-abelian examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑