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arXiv 1802.04682math.AGmath.NT
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关于Shimura簇的子簇的几何Mumford-Tate猜想

On the geometric Mumford-Tate conjecture for subvarieties of Shimura varieties

Gregorio Baldi

摘要:

我们研究图像的$\ell$ -进表示重视子品种的志村品种$Sh_K(G,X)$,不包含在一个较小的志村子品种,并没有isotrivial组件。我们表明,$\ell$足够大(取决于志村基准$(G,X)$和子品种),这样的图像包含的$\mathbb{Z}_\ell$ -点来自单连通覆盖的派生子群$G$。这可以被看作是积分$\ell$ -adic Mumford-Tate猜想的几何版本。

英文摘要:

We study the image of $\ell$-adic representations attached to subvarieties of Shimura varieties $Sh_K(G,X)$ that are not contained in a smaller Shimura subvariety and have no isotrivial components. We show that, for $\ell$ large enough (depending on the Shimura datum $(G,X)$ and the subvariety), such image contains the $\mathbb{Z}_\ell$-points coming from the simply connected cover of the derived subgroup of $G$. This can be regarded as a geometric version of the integral $\ell$-adic Mumford-Tate conjecture.

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