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arXiv 1306.2070math.NTmath.AGmath.RT
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关于局部对称簇的上同调的挠

On torsion in the cohomology of locally symmetric varieties

Peter Scholze

摘要:

本文的主要结果是全实域或CM域上的局部对称空间的$\GL_n$的模$p$(或模$p^m$)上同调的伽罗瓦表示的存在性,证明了Ash等人的结论.根据Clozel的旧建议,最近由Harris-Lan-Taylor-Thorne实现了特征0上同调类,人们实现了$\GL_n$的局部对称空间的上同调作为辛或酉Shimura簇的上同调的边界贡献,因此关键问题是理解Shimura簇的上同调中的挠。从而证明了Shimura簇(Hodge型)的$p$ -adic几何的新结果.也就是说,志村品种成为perfectoid时,通过对所有水平的逆极限在$p$,和一个新的周期地图对国旗品种存在于他们,所谓的Hodge-Tate周期地图。它大致类似于埃尔米特对称域(这大致是志村簇的复点的所有水平上的逆极限)嵌入其紧对偶。Hodge-Tate周期映射有几个有利的性质,最重要的是它与远离$p$的Hecke算子交换(因为这些Hecke算子在旗簇上的平凡作用),并且自守向量丛来自旗簇的拉回。

英文摘要:

The main result of this paper is the existence of Galois representations associated with the mod $p$ (or mod $p^m$) cohomology of the locally symmetric spaces for $\GL_n$ over a totally real or CM field, proving conjectures of Ash and others. Following an old suggestion of Clozel, recently realized by Harris-Lan-Taylor-Thorne for characteristic 0 cohomology classes, one realizes the cohomology of the locally symmetric spaces for $\GL_n$ as a boundary contribution of the cohomology of symplectic or unitary Shimura varieties, so that the key problem is to understand torsion in the cohomology of Shimura varieties. Thus, we prove new results on the $p$-adic geometry of Shimura varieties (of Hodge type). Namely, the Shimura varieties become perfectoid when passing to the inverse limit over all levels at $p$, and a new period map towards the flag variety exists on them, called the Hodge-Tate period map. It is roughly analogous to the embedding of the hermitian symmetric domain (which is roughly the inverse limit over all levels of the complex points of the Shimura variety) into its compact dual. The Hodge-Tate period map has several favorable properties, the most important being that it commutes with the Hecke operators away from $p$ (for the trivial action of these Hecke operators on the flag variety), and that automorphic vector bundles come via pullback from the flag variety.

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