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arXiv 2507.02483math.AG
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函数域上的类域理论与有限阿贝尔 torsors

Class field theory for function fields and finite abelian torsors

The University of Arizona(亚利桑那大学);Nagoya Institute of Technology(名古屋工业大学)

Bryden Cais, Shusuke Otabe

AI总结:

本文将经典几何类域理论推广到函数域,通过一般化雅可比簇的同态来分类fppf torsors,并用塞雷-奥尔特基本群描述阿贝尔化诺伊基本群。

摘要:

设$U$为一个光滑连通曲线,其光滑紧致化为$X$,本文将经典几何类域理论推广,以一般化雅可比簇的同态来分类$U$上的fppf $G$-torsors,其中$G$为有限阿贝尔群方案。随后,本文将此分类应用于以一般化雅可比簇的塞雷-奥尔特基本群来描述$U$的阿贝尔化诺伊基本群方案;当$U=X$为射影时,恢复了$X$的阿贝尔化基本群方案作为其雅可比簇所有 torsion 子方案的极限描述。

英文摘要:

Let $U$ be a smooth and connected curve over an algebraically closed field of positive characteristic, with smooth compactification $X$. We generalize classical Geometric Class Field theory to provide a classification of fppf $G$-torsors over $U$ in terms of isogenies of generalized Jacobians, for any finite abelian group scheme $G$. We then apply this classification to give a novel description of the abelianized Nori fundamental group scheme of $U$ in terms of the Serre--Oort fundamental groups of generalized Jacobians of $X$; when $U=X$ is projective, we recover a well known description of the abelianized fundamental group scheme of $X$ as the projective limit of all torsion subgroup schemes of its Jacobian.

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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