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算法通用平展$(φ,Γ)$-模

Algorithmic universal étale $(φ,Γ)$-modules

Zhongyipan Lin

arXiv 2608.01567首次发表:更新:

AI 中文总结

针对满足$p>h_{\breve{G}}$的连通约化群$\breve{G}$,通过引入模$p$韦伊-德莱恩栈算法计算约化Emerton-Gee栈的不可约分支,确立其等维性与晶态提升存在性,且已在$\text{F}_4$等情形验证该算法。

AI 中文摘要

设$F/\boldsymbol{\text{Q}}_p$为有限扩张,$\breve{G}$为满足$p>h_{\breve{G}}$($h_{\breve{G}}$为Coxeter数)的连通中心的连通约化群。我们通过引入约化族中捕获$(φ,Γ)$-模导出结构的模$p$韦伊-德莱恩栈,写出约化Emerton-Gee栈(共同覆盖整个$\boldsymbol{\text{X}}_{\breve{G},\text{red}}^{\text{EG}}$的Borel版本与扭曲Borel版本)的显式多项式方程。这使我们能算法计算$\boldsymbol{\text{X}}_{\breve{G},\text{red}}^{\text{EG}}$的不可约分支集合,从而确立其等维性,并通过不可约分支总数等于(模$p$)晶态(或潜在半稳定)分支数证明晶态提升的存在性。论证最后一步是插值刚性解析韦伊-德莱恩栈与模$p$韦伊-德莱恩栈以推导潜在半稳定分支数。基于Gröbner基的算法初始实现,确立了$\breve{G}=\text{F}_4$时所有$F/\boldsymbol{\text{Q}}_p$的晶态提升存在性,以及$\breve{G}=\text{E}_6、\text{E}_7、\text{E}_8$时除有限个$F/\boldsymbol{\text{Q}}_p$外的晶态提升存在性。

英文摘要

Let $F/\mathbb{Q}_p$ be a finite extension and let $\breve{G}$ be a connected reductive group with connected center satisfying $p>h_{\breve{G}}$ (the Coxeter number). We write down explicit polynomial equations for the reduced Emerton-Gee stacks (the Borel and the twisted Borel versions that jointly cover the entire $\mathcal{X}_{\breve{G},\mathrm{red}}^{\mathrm{EG}}$), by introducing the mod $p$ Weil-Deligne stacks capturing derived structures of $(φ, Γ)$-modules in reduced families. This allows us to algorithmically compute the set of irreducible components of $\mathcal{X}_{\breve{G},\mathrm{red}}^{\mathrm{EG}}$, thereby establishing its equidimensionality, and the existence of crystalline lifts by showing the total number of irreducible components equals the number of (mod $p$) crystalline (or potentially semistable) components. The last step of the arguments is to interpolate the rigid analytic Weil-Deligne stacks and the mod $p$ Weil-Deligne stacks to deduce the number of potentially semistable components. An initial implementation of the algorithms based on Gröbner basis establishes the existence of crystalline lifts in the $\breve{G}=\mathrm{F}_4$ case for all $F/\mathbb{Q}_p$, and in the remaining $\breve{G}=\mathrm{E}_6, \mathrm{E}_7$, and $\mathrm{E}_8$ cases for all but finitely many $F/\mathbb{Q}_p$.

Comments68 pages

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