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arXiv 2203.12293math.AG
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p-adic Hodge理论中的弱容许轨迹与Newton分层

Weakly admissible locus and Newton stratification in p-adic Hodge theory

Miaofen Chen, Jilong Tong

摘要:

标志簇$\mathcal{F}(G, μ)$内的基本容许轨迹$\mathcal{F}(G, μ, b)^a$,附着于一个约化群$G$,其极小余特征标$μ$为$G$,是复解析周期空间的$p$ -adic模拟。它有一个代数近似$\mathcal{F}(G, μ, b)^{wa}$内的标志品种,称为弱容许轨迹。在旗簇$\mathcal{F}(G, μ)$上,我们有牛顿分层,它的唯一开层是容许轨迹。本文研究了牛顿层与弱容许轨迹之间的关系。我们证明了$\mathcal{F}(G, μ, b)^{wa}$是极大的(在它是Newton分层的并集的意义上)等价于$(G, μ)$弱完全HN-可分解,它也等价于Newton分层比Harder-Narasimhan分层更细的条件.这些等价条件是完全HN-可分解条件和弱可达条件的推广。此外,我们还给出了一个判定Newton层是否完全包含在Festeres-Fontaine曲线上涉及$G$ -丛作为$M$ -丛扩张的弱容许轨迹中的判据,其中$M$是$G$的Levi子群.当$G=\mathrm{GL}_n$时,我们还给出了一个组合归纳准则来判定Festhes-Fontaine曲线上的向量丛是否是两个给定向量丛的扩张.

英文摘要:

The basic admissible locus $\mathcal{F}(G, μ, b)^a$ inside the flag variety $\mathcal{F}(G, μ)$, attached to a reductive group $G$ with a minuscule cocharacter $μ$ of $G$, is a $p$-adic analogue of the complex analytic period spaces. It has an algebraic approximation $\mathcal{F}(G, μ, b)^{wa}$ inside the flag variety, called the weakly admissible locus. On the flag variety $\mathcal{F}(G, μ)$, we have the Newton stratification which has the admissible locus as its unique open stratum. In this paper, we study the relation between the Newton strata and the weakly admissible locus. We show that $\mathcal{F}(G, μ, b)^{wa}$ is maximal (in the sense that it's a union of Newton strata) is equivalent to $(G, μ)$ weakly fully HN-decomposable, it's also equivalent to the condition that the Newton stratification is finer than the Harder-Narasimhan stratification. These equivalent conditions are generalizations of the fully HN-decomposable condition and the weakly accessible condition. Moreover, we give a criterion to determine whether a Newton stratum is completely contained in the weakly admissible locus involving $G$-bundles as extensions of $M$-bundles over the Fargues-Fontaine curve, where $M$ is a Levi subgroup of $G$. When $G=\mathrm{GL}_n$, we also give a combinatorial inductive criterion to determine whether a vector bundle over the Fargues-Fontaine curve is an extension of two given vector bundles.

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