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arXiv 1111.4731math.RT
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关于由超尖点表示产生的有限辛模

On finite symplectic modules arising from supercuspidal representations

Geo Kam-Fai Tam

摘要:

设$F$是具有有限剩余域的非阿基米德局部域.设$\mathcal{A}^{et}_n(F)$是Bushnell-Henniart研究的$\mathrm{GL}_n(F)$的本质驯服不可约超尖点表示的同构类的集合。已知我们可以通过容许对$(E, ξ)$的等价类的集合$P_n(F)$来参数化$\mathcal{A}^{et}_n(F)$,所述容许对$(E, ξ)$由度$n$的tamely分歧扩张$E/F$和$E^\times$的$F$ -容许特征$ξ$组成。我们感兴趣的是一个有限辛模$V = V(ξ)$所产生的超尖表示的建设,从字符$ξ$。已知该模块$V$允许关于依赖于$ξ$的辛形式的正交分解。我们与一个固定的环境模块$U$包含$V$和$U$分解的方式类似于根空间分解的李代数$\mathfrak{gl}_n(F)$。然后,我们得到了一个完全的正交分解的子模块$V$的限制。这种分解将超尖点的有限辛模与L-群的某些容许嵌入联系起来。这种关系对本质上驯服的局部朗兰兹对应提供了不同的解释。

英文摘要:

Let $F$ be a non-Archimedean local field with finite residue field. Let $\mathcal{A}^{et}_n(F)$ be the collection of isomorphism classes of essentially tame irreducible supercuspidal representations of $\mathrm{GL}_n(F)$ studied by Bushnell-Henniart. It is known that we can parameterize $\mathcal{A}^{et}_n(F)$ by the collection $P_n(F)$ of equivalence classes of admissible pairs $(E, ξ)$ consisting of a tamely ramified extension $E/F$ of degree $n$ and an $F$-admissible character $ξ$ of $E^\times$. We are interested in a finite symplectic module $V = V(ξ)$ arising from the construction of the supercuspidal representation from the character $ξ$. This module $V$ is known to admit an orthogonal decomposition with respect to a symplectic form depending on $ξ$. We work with a fixed ambient module $U$ containing $V$ and show that $U$ decomposes in a way analogous to the root space decomposition of the Lie algebra $\mathfrak{gl}_n(F)$. We then obtain a complete orthogonal decomposition of the submodule $V$ by restriction. Such decomposition relates the finite symplectic module of a supercuspidal and certain admissible embedding of L-groups. This relation provides a different interpretation on the essentially tame local Langlands correspondence.

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