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arXiv 1407.4595math.NT
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函数Hecke代数与p-adic GL_n的单Bernstein块(英文)

Functional Hecke algebras and simple Bernstein blocks of a p-adic GL_n in non-defining characteristic

David-Alexandre Guiraud

摘要:

设$G_{n}=\operatorname{GL}_{n}(F)$,其中$F$是具有剩余特征$p$的非阿基米德局部域,并且其中$n=2k$是偶数。在这篇文章中,我们研究了一个问题发生在分解的范畴$\ell$ -模光滑表示的$G_n$到伯恩斯坦块(其中$\ell\neq p$)。在\cite{guiraud}中没有研究过的最简单的块是由标准抛物子群和Levi因子$M=\GL_k(F) \times \GL_k(F)$以及形式为$π_0 \boxtimes π_0$的$M$ -表示和超尖点$\GL_k(F)$ -表示定义的块。这个块是Morita等价于一个Hecke代数,我们可以把它描述为一个有限Hecke代数的扭曲张量积(即,e.一种Hecke代数,出现在非定义特征$\ell$中的有限群$\GL_k(p^α)$的表示论中)和$\mathbb{Z}^2$的群环中。这使我们能够描述有限Hecke代数之间的一个固定连接(类似于Broué在\cite{Broue}中假设的一个连接)如何导致所描述的块与$\operatorname{GL}_2(F^k)$的幂幺块之间的等价,其中$F^k$是$k$在$F$上的非分歧扩张。

英文摘要:

Let $G_{n}=\operatorname{GL}_{n}(F)$, where $F$ is a non-archimedean local field with residue characteristic $p$ and where $n=2k$ is even. In this article, we investigate a question occurring in the decomposition of the category of $\ell$-modular smooth representations of $G_n$ into Bernstein blocks (where $\ell\neq p$). The easiest block not investigated in \cite{guiraud} is the one defined by the standard parabolic subgroup with Levi factor $M=\GL_k(F) \times \GL_k(F)$ and by an $M$-representation of the form $π_0 \boxtimes π_0$ with $π_0$ a supercuspidal $\GL_k(F)$-representation. This block is Morita equivalent to a Hecke algebra which we can describe as a twisted tensor product of a finite Hecke algebra (i. e. a Hecke algebra occurring in the representation theory of the finite group $\GL_k(p^α)$ in non-defining characteristic $\ell$) and the group ring of $\mathbb{Z}^2$. This enables us to describe how a conjectured connection between finite Hecke algebras (which is similar to a connection postulated by Broué in \cite{Broue}) would lead to an equivalence between the described block and the unipotent block of $\operatorname{GL}_2(F^k)$, where $F^k$ is the unramified extension of degree $k$ over $F$.

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