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arXiv 1408.3370math.RTmath.NT
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关于$p$-进约化群的特殊表示

On special representations of $p$-adic reductive groups

Elmar Grosse-Klönne

摘要:

设$F$是非阿基米德局部紧域,$G$是$F$上的可裂连通约化群.对于抛物子群$Q\subset G$和环$L$,我们考虑$L$-模$$(*)\quad\quad\quad\quad C^{\infty}(G/Q,L)/\sum_{Q'\supsetneq Q}C^{\infty}(G/Q',L).$$上的$G$-表示.设$I\subset G$表示Iwahori子群.我们定义了一个自由有限秩$L$-模${\mathfrak M}$(依赖于$Q$;如果$Q$是Borel子群,那么$(*)$是Steinberg表示,${\mathfrak M}$是秩1的),并构造了$(*)$到$C^{\infty}(I,{\mathfrak M})$的$I$-等变嵌入.这允许在$(*)$中计算$I$-不变量。然后,我们证明,如果$L$是一个字段的特征等于剩余特征的$F$,如果$G$是一个典型的组,那么$G$-表示$(*)$是不可约的。这是类似的一个定理的Casselman(其中说同样的$L={\mathbb C}$);它已澄清的Vignéras。Herzig(对于$G={\rm GL}_n(F)$)和Abe(对于一般$G$)给出了$G$的不可约容许模$p$表示的超奇异表示的分类定理。他们的一些论点依赖于目前的工作。

英文摘要:

Let $F$ be a non-Archimedean locally compact field, let $G$ be a split connected reductive group over $F$. For a parabolic subgroup $Q\subset G$ and a ring $L$ we consider the $G$-representation on the $L$-module$$(*)\quad\quad\quad\quad C^{\infty}(G/Q,L)/\sum_{Q'\supsetneq Q}C^{\infty}(G/Q',L).$$Let $I\subset G$ denote an Iwahori subgroup. We define a certain free finite rank $L$-module ${\mathfrak M}$ (depending on $Q$; if $Q$ is a Borel subgroup then $(*)$ is the Steinberg representation and ${\mathfrak M}$ is of rank one) and construct an $I$-equivariant embedding of $(*)$ into $C^{\infty}(I,{\mathfrak M})$. This allows the computation of the $I$-invariants in $(*)$. We then prove that if $L$ is a field with characteristic equal to the residue characteristic of $F$ and if $G$ is a classical group, then the $G$-representation $(*)$ is irreducible. This is the analog of a theorem of Casselman (which says the same for $L={\mathbb C}$); it had been conjectured by Vignéras. Herzig (for $G={\rm GL}_n(F)$) and Abe (for general $G$) have given classification theorems for irreducible admissible modulo $p$ representations of $G$ in terms of supersingular representations. Some of their arguments rely on the present work.

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