Shimura varieties at level and Galois representations
Shimura varieties at level and Galois representations
复制标题
水平上的志村簇和伽罗瓦表示
DOI:
10.1112/s0010437x20007149
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发表时间:
2020
影响因子:
1.8
通讯作者:
Sheng
中科院分区:
文献类型:
--
作者:
A. Caraiani;Daniel R. Gulotta;Chi;C. Johansson;Lucia Mocz;Emanuel Reinecke;Sheng
We show that the compactly supported cohomology of certain $\text{U}(n,n)$- or $\text{Sp}(2n)$-Shimura varieties with $\unicode[STIX]{x1D6E4}_{1}(p^{\infty })$-level vanishes above the middle degree. The only assumption is that we work over a CM field $F$ in which the prime $p$ splits completely. We also give an application to Galois representations for torsion in the cohomology of the locally symmetric spaces for $\text{GL}_{n}/F$. More precisely, we use the vanishing result for Shimura varieties to eliminate the nilpotent ideal in the construction of these Galois representations. This strengthens recent results of Scholze [On torsion in the cohomology of locally symmetric varieties, Ann. of Math. (2) 182 (2015), 945–1066; MR 3418533] and Newton–Thorne [Torsion Galois representations over CM fields and Hecke algebras in the derived category, Forum Math. Sigma 4 (2016), e21; MR 3528275].
影响因子:
3.1
作者:
Calegari, Frank;Geraghty, David
通讯作者:
Geraghty, David