中文

Shimura簇上标准$\ell$-进局部系统的相容性

数论 2024-10-08 v2 代数几何

摘要

对于超刚性 regime 中的Shimura簇(G,X)(G, X)和整齐水平子群K0K_0,我们证明与数域点yShK0(G,X)(F)y \in \mathrm{Sh}_{K_0}(G, X)(F)相关的标准\ell-进表示族,{ρy, ⁣:Gal(Q/F)Gad(Q)}\left\{ \rho_{y, \ell} \colon \mathrm{Gal}(\overline{\mathbb{Q}}/F) \to G^{\mathrm{ad}}(\mathbb{Q}_{\ell}) \right\}_{\ell},构成Gad(Q)G^{\mathrm{ad}}(\mathbb{Q}_{\ell})-表示的一个相容系统:存在整数N(y)N(y)使得对所有\ellρy,\rho_{y, \ell}N(y)N(y) \ell之外非分歧,且对所有\ell \neq \ell'vN(y)v \nmid N(y)\ell \ell'ρy,(Frobv)\rho_{y, \ell}(\mathrm{Frob}_v)ρy,(Frobv)\rho_{y, \ell'}(\mathrm{Frob}_v)的共轭类的半单部分(是Q\mathbb{Q}-有理且)相等。我们从ShK0(G,X)\mathrm{Sh}_{K_0}(G, X)内连通Shimura簇上标准G(Q)G(\mathbb{Q}_{\ell})-值局部系统的一个更强的相容性结果推导出这一点。我们的定理尤其适用于非阿贝尔型的Shimura簇,并代表了非阿贝尔型中首个此类与\ell无关的结果。

关键词

引用

@article{arxiv.2303.03863,
  title  = {Compatibility of canonical $\ell$-adic local systems on Shimura varieties},
  author = {Christian Klevdal and Stefan Patrikis},
  journal= {arXiv preprint arXiv:2303.03863},
  year   = {2024}
}

备注

At referee's advice, the preliminary section on tame specialization has been deleted, and the abstract results for superrigid local systems have been presented in less generality. A few small corrections (especially the end of Prop 2.3) and other minor expository changes have been made