On the reducibility of induced representations for classical p-adic groups and related affine Hecke algebras

Autor: Dan Ciubotaru, Volker Heiermann
Přispěvatelé: University of Oxford [Oxford], Institut de Mathématiques de Marseille (I2M), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), ANR-13-BS01-0012,FERPLAY,Formule des Traces Relative, Périodes, Fonctions L et Analyse Harmonique(2013), University of Oxford
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Israël Journal of Mathematics
Israël Journal of Mathematics, Hebrew University Magnes Press, 2019, ⟨10.1007/s11856-019-1857-7⟩
Israel Journal of Mathematics
Israel Journal of Mathematics, 2019, ⟨10.1007/s11856-019-1857-7⟩
ISSN: 0021-2172
1565-8511
DOI: 10.1007/s11856-019-1857-7⟩
Popis: Let $\pi $ be an irreducible smooth complex representation of a general linear $p$-adic group and let $\sigma $ be an irreducible complex supercuspidal representation of a classical $p$-adic group of a given type, so that $\pi\otimes\sigma $ is a representation of a standard Levi subgroup of a $p$-adic classical group of higher rank. We show that the reducibility of the representation of the appropriate $p$-adic classical group obtained by (normalized) parabolic induction from $\pi\otimes\sigma $ does not depend on $\sigma $, if $\sigma $ is "separated" from the supercuspidal support of $\pi $. (Here, "separated" means that, for each factor $\rho $ of a representation in the supercuspidal support of $\pi $, the representation parabolically induced from $\rho\otimes\sigma $ is irreducible.) This was conjectured by E. Lapid and M. Tadi\'c. (In addition, they proved, using results of C. Jantzen, that this induced representation is always reducible if the supercuspidal support is not separated.) More generally, we study, for a given set $I$ of inertial orbits of supercuspidal representations of $p$-adic general linear groups, the category $\CC _{I,\sigma}$ of smooth complex finitely generated representations of classical $p$-adic groups of fixed type, but arbitrary rank, and supercuspidal support given by $\sigma $ and $I$, show that this category is equivalent to a category of finitely generated right modules over a direct sum of tensor products of extended affine Hecke algebras of type $A$, $B$ and $D$ and establish functoriality properties, relating categories with disjoint $I$'s. In this way, we extend results of C. Jantzen who proved a bijection between irreducible representations corresponding to these categories. The proof of the above reducibility result is then based on Hecke algebra arguments, using Kato's exotic geometry.
Comment: 21 pages, the results of the paper have been improved thanks to the remarks and encouragements of the anonymous referee
Databáze: OpenAIRE
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