Newton Polygon Stratification of the Torelli Locus in Unitary Shimura Varieties

Newton Polygon Stratification of the Torelli Locus in Unitary Shimura Varieties
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酉志村品种 Torelli 轨迹的牛顿多边形分层

DOI:
10.1093/imrn/rnaa306
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发表时间:
2020
影响因子:
1
通讯作者:
Tang, Yunqing
Tang, Yunqing
中科院分区:
数学1区
文献类型:
--
作者:
Li, Wanlin;Mantovan, Elena;Pries, Rachel;Tang, Yunqing

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本文研究了若干Shimura类的模约化的牛顿多边形分层与Torelli轨迹的交点。我们发展了一种紧抓法来证明开托雷利轨迹与某些牛顿多边形地层的交点是非空的。这使我们能够在某些相容条件下,对奥尔特关于其牛顿多边形为合并和的特征光滑曲线的问题给出一个肯定的答案。作为一个应用,我们给出了无限多个牛顿多边形的新例子,这些例子出现在投影线的循环覆盖的光滑曲线上。其中大多数出现在归纳系统中,这些系统在西格尔模变体中表现出开放的Torelli轨迹与牛顿多边形分层的不太可能相交。此外,对于Moonen工作中发现的20个特殊的Shimura变异体,我们证明了所有牛顿多边形地层都与开放的Torelli轨迹相交(在超奇异情况下)。
We study the intersection of the Torelli locus with the Newton polygon stratification of the moduloreduction of certain Shimura varieties. We develop a clutching method to show that the intersection of the open Torelli locus with some Newton polygon strata is non-empty. This allows us to give a positive answer, under some compatibility conditions, to a question of Oort about smooth curves in characteristicwhose Newton polygons are an amalgamate sum. As an application, we produce infinitely many new examples of Newton polygons that occur for smooth curves that are cyclic covers of the projective line. Most of these arise in inductive systems that demonstrate unlikely intersections of the open Torelli locus with the Newton polygon stratification in Siegel modular varieties. In addition, for the 20 special Shimura varieties found in Moonen’s work, we prove that all Newton polygon strata intersect the open Torelli locus (ifin the supersingular cases).
由射影线循环覆盖的特殊族产生的牛顿多边形
DOI: 10.1007/s40993-018-0149-3
发表时间: 2019
影响因子: 0.8
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Li, Wanlin;Mantovan, Elena;Pries, Rachel;Tang, Yunqing
通讯作者: Tang, Yunqing
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