Translator Disclaimer
2018 Jordan blocks of cuspidal representations of symplectic groups
Corinne Blondel, Guy Henniart, Shaun Stevens
Algebra Number Theory 12(10): 2327-2386 (2018). DOI: 10.2140/ant.2018.12.2327


Let G be a symplectic group over a nonarchimedean local field of characteristic zero and odd residual characteristic. Given an irreducible cuspidal representation of G, we determine its Langlands parameter (equivalently, its Jordan blocks in the language of Mœglin) in terms of the local data from which the representation is explicitly constructed, up to a possible unramified twist in each block of the parameter. We deduce a ramification theorem for G, giving a bijection between the set of endoparameters for G and the set of restrictions to wild inertia of discrete Langlands parameters for G, compatible with the local Langlands correspondence. The main tool consists in analyzing the Hecke algebra of a good cover, in the sense of Bushnell–Kutzko, for parabolic induction from a cuspidal representation of G× GLn, seen as a maximal Levi subgroup of a bigger symplectic group, in order to determine reducibility points; a criterion of Mœglin then relates this to Langlands parameters.


Download Citation

Corinne Blondel. Guy Henniart. Shaun Stevens. "Jordan blocks of cuspidal representations of symplectic groups." Algebra Number Theory 12 (10) 2327 - 2386, 2018.


Received: 30 May 2017; Revised: 2 June 2018; Accepted: 20 July 2018; Published: 2018
First available in Project Euclid: 14 February 2019

zbMATH: 07026820
MathSciNet: MR3911133
Digital Object Identifier: 10.2140/ant.2018.12.2327

Primary: 22E50
Secondary: 11F70

Keywords: $p$-adic group , endoparameter , Jordan block , local Langlands correspondence , symplectic group , types and covers

Rights: Copyright © 2018 Mathematical Sciences Publishers


This article is only available to subscribers.
It is not available for individual sale.

Vol.12 • No. 10 • 2018
Back to Top