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arXiv 1607.04486math.RT
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Harish-Chandra函子的一个变体

A variant of Harish-Chandra functors

Tyrone Crisp, Ehud Meir, Uri Onn

摘要:

Harish-Chandra归纳和限制函子在有限域上约化群的表示论中起着关键作用。在本文中,扩展早期的工作,我们介绍和研究这些函子适用于广泛的有限和投射有限群,典型的例子是紧凑的开子群的约化群在非阿基米德局部域的推广。我们证明,这些概括是兼容的两个常用的工具来研究(光滑,复杂)表示这样的群体,即克利福德理论和轨道方法。作为一个测试案例,我们详细研究了长度为2的有限局部主理想环上的辛群Sp(4)的Siegel Levi子群的表示的归纳和表示的限制。在这种情况下,我们得到一个麦基型公式的组成,这些感应和限制函子,这是一个完美的模拟著名的公式组成的哈里什-钱德拉函子。在另一个方向上,我们研究了GL(n,F)的Iwahori子群I(n)的表示,其中F是非阿基米德局部域.我们建立了I(n)的不可约表示集合与较小Iwahori子群的本原不可约表示元组之间的双射,其中双射性由合适的限制函子的消失来定义.

英文摘要:

Harish-Chandra induction and restriction functors play a key role in the representation theory of reductive groups over finite fields. In this paper, extending earlier work of Dat, we introduce and study generalisations of these functors which apply to a wide range of finite and profinite groups, typical examples being compact open subgroups of reductive groups over non-archimedean local fields. We prove that these generalisations are compatible with two of the tools commonly used to study the (smooth, complex) representations of such groups, namely Clifford theory and the orbit method. As a test case, we examine in detail the induction and restriction of representations from and to the Siegel Levi subgroup of the symplectic group Sp(4) over a finite local principal ideal ring of length two. We obtain in this case a Mackey-type formula for the composition of these induction and restriction functors which is a perfect analogue of the well-known formula for the composition of Harish-Chandra functors. In a different direction, we study representations of the Iwahori subgroup I(n) of GL(n,F), where F is a non-archimedean local field. We establish a bijection between the set of irreducible representations of I(n) and tuples of primitive irreducible representations of smaller Iwahori subgroups, where primitivity is defined by the vanishing of suitable restriction functors.

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