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arXiv 2210.04450math.NTmath.AG
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分圆栈上的高度模空间与函数域上椭圆曲线的计数

Height moduli on cyclotomic stacks and counting elliptic curves over function fields

Dori Bejleri, Jun-Yong Park, Matthew Satriano

AI总结:

本文利用twisted stable maps和stacky height functions理论,构造了参数化cyclotomic stacks上固定高度有理点的有限型模空间,解释了函数域上椭圆曲线计数中的低阶主项,回答了Venkatesh的问题。

摘要:

对于proper stack,与scheme不同,其有理点与整点之间存在区别。此外,有理点具有额外的自同构群。我们证明,这些区别恰好解释了在函数域上椭圆曲线的精确计数中出现的低阶主项,从而在此情形下回答了Venkatesh的问题。更一般地,利用twisted stable maps理论以及Ellenberg、Zureick-Brown和第三作者近期引入的stacky height functions,我们构造了有限型模空间,用于参数化一大类栈(即所谓的cyclotomic stacks)上固定高度的有理点。主要工具是有理点、twisted maps与weighted linear series之间的对应关系。在此过程中,我们得到了Northcott性质以及Tate's algorithm在cyclotomic stacks上的推广,并计算了weighted projective stacks的这些模空间的精确motives。

英文摘要:

For proper stacks, unlike schemes, there is a distinction between rational and integral points. Moreover, rational points have extra automorphism groups. We show that these distinctions exactly account for the lower order main terms appearing in precise counts of elliptic curves over function fields, answering a question of Venkatesh in this case. More generally, using the theory of twisted stable maps and the stacky height functions recently introduced by Ellenberg, Zureick-Brown, and the third author, we construct finite type moduli spaces which parametrize rational points of fixed height on a large class of stacks, so-called cyclotomic stacks. The main tool is a correspondence between rational points, twisted maps and weighted linear series. Along the way, we obtain the Northcott property as well as a generalization of Tate's algorithm for cyclotomic stacks, and compute the exact motives of these moduli spaces for weighted projective stacks.

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。

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