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arXiv 2101.07510math.AG
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关于$B_{dR}^+$ -格拉斯曼阶的牛顿地层

On Newton strata in the $B_{dR}^+$-Grassmannian

Eva Viehmann

摘要:

本文研究了任意约化群G在Festives-Fontaine曲线上的抛物约化和G-丛的Newton点,以及在$B_{dR}^+$ -Grassmannian上的Newton分层.令$Bun_G$是Festives-Fontaine曲线上G-丛的堆叠。我们的第一个主要结果是证明了在$Bun_G$的点与Kottwitz集B(G)相同的情况下,拓扑空间$|Bun_G|$上的闭包关系与B(G)上通常的偏序的相反关系是一致的.进一步证明了$B_{dR}^+$ -Grassmannian中极小仿射Schubert胞腔中的每个非Hodge-Newton可分解的Newton层与弱容许轨迹相交,从而证明了Chen的一个猜想.同时,我们研究了$G$ -丛的抛物约化的一些有趣的性质,并确定了哪些牛顿层具有经典点。

英文摘要:

We study parabolic reductions and Newton points of G-bundles on the Fargues-Fontaine curve and the Newton stratification on the $B_{dR}^+$-Grassmannian for any reductive group G. Let $Bun_G$ be the stack of G-bundles on the Fargues-Fontaine curve. Our first main result is to show that under the identification of the points of $Bun_G$ with Kottwitz's set B(G), the closure relations on the topological space $|Bun_G|$ coincide with the opposite of the usual partial order on B(G). Furthermore, we prove that every non-Hodge-Newton decomposable Newton stratum in a minuscule affine Schubert cell in the $B_{dR}^+$-Grassmannian intersects the weakly admissible locus, proving a conjecture of Chen. On the way, we study several interesting properties of parabolic reductions of $G$-bundles, and determine which Newton strata have classical points.

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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