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arXiv 2009.07441math.NT
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阿贝尔簇单值群的确定

Determining monodromy groups of abelian varieties

David Zywina

摘要:

与数域上的阿贝尔簇相关联的是几个有趣且相关的群:motivic伽罗瓦群、Mumford-Tate群、$\ell$ -adic monodromy群和Sato-Tate群。假设Mumford-Tate猜想,我们表明,从我们的阿贝尔簇的两个精心挑选的Frobenius多项式,我们可以恢复这些群体的单位连通区(或至少是一个内部形式),直到同构,以及它们的自然表示。我们还得到了一个实用的概率算法来计算这些群体考虑越来越多的Frobenius多项式,这些群体是连接和还原,因此可以表示为根数据。这些群体是degradularly与代数圈,特别是我们得到了一个概率算法来计算我们的阿贝尔簇的霍奇类的尺寸为任何固定的程度。

英文摘要:

Associated to an abelian variety over a number field are several interesting and related groups: the motivic Galois group, the Mumford-Tate group, $\ell$-adic monodromy groups, and the Sato-Tate group. Assuming the Mumford-Tate conjecture, we show that from two well chosen Frobenius polynomials of our abelian variety, we can recover the identity component of these groups (or at least an inner form), up to isomorphism, along with their natural representations. We also obtain a practical probabilistic algorithm to compute these groups by considering more and more Frobenius polynomials; the groups are connected and reductive and thus can be expressed in terms of root datum. These groups are conjecturally linked with algebraic cycles and in particular we obtain a probabilistic algorithm to compute the dimension of the Hodge classes of our abelian variety for any fixed degree.

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