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arXiv 1810.06910math.RT
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Steinberg表示的分支律:秩1情形

Branching laws for the Steinberg representation: the rank 1 case

Paul Broussous

摘要:

设$G/H$是$p$ -adic域$F$上的约化对称空间,代数群$G$和$H$是相对秩$1$的半单. $G$的Steinberg表示$\St_G$的分支问题之一是确定交织空间${\rm Hom}_H (\St_G ,π)$的维数,对于$H$的任何不可约表示$π$。在这项工作中,我们不计算这个维度,但显示它是如何与其他一些交织空间${\rm Hom}_{K_i} ({\tilde π} ,1)$的维度,为一定的有限家庭$K_i$,$i=1,...,r$,各向异性子群的$H$(这里${\tilde π}$表示contradient表示,$1$平凡字符)。换句话说,我们表明,有一种'互惠法'有关两个不同的分支问题。

英文摘要:

Let $G/H$ be a reductive symmetric space over a $p$-adic field $F$, the algebraic groups $G$ and $H$ being assumed semisimple of relative rank $1$. One of the branching problems for the Steinberg representation $\St_G$ of $G$ is the determination of the dimension of the intertwining space ${\rm Hom}_H (\St_G ,π)$, for any irreducible representation $π$ of $H$. In this work we do not compute this dimension, but show how it is related to the dimensions of some other intertwining spaces ${\rm Hom}_{K_i} ({\tilde π} ,1)$, for a certain finite family $K_i$, $i=1,...,r$, of anisotropic subgroups of $H$ (here ${\tilde π}$ denote the contragredient representation, and $1$ the trivial character). In other words we show that there is a sort of `reciprocity law' relating two different branching problems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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