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arXiv 2008.09060math.AGmath.NT
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关于覆盖和曲线的有界分歧

Bounding ramification by covers and curves

Hélène Esnault, Vasudevan Srinivas

摘要:

证明了定义在特征为$p\neq \ell$的代数闭域$k$上的光滑簇$X$上的有界秩和分枝的$\bar {\mathbb Q}_\ell$ -局部系统在余维$2$外被有界度的有限可分覆盖所tamified.在秩1中,有一条曲线保持它们的单值性。有一条曲线定义在满足莱夫谢茨定理的有限次$k$的纯超越扩张的代数闭包上。最后一个版本:纠正了轻微的错别字。

英文摘要:

We prove that $\bar {\mathbb Q}_\ell$-local systems of bounded rank and ramification on a smooth variety $X$ defined over an algebraically closed field $k$ of characteristic $p\neq \ell$ are tamified outside of codimension $2$ by a finite separable cover of bounded degree. In rank one, there is a curve which preserves their monodromy. There is a curve defined over the algebraic closure of a purely transcendental extension of $k$ of finite degree which fulfills the Lefschetz theorem. Last version: minor typos corrected.

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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