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SUR LES PAQUETS D’ARTHUR DE $\mathbf{Sp}(2n,\mathbb{R})$ CONTENANT DES MODULES UNITAIRES DE PLUS HAUT POIDS, SCALAIRES

Part of: Lie groups

Published online by Cambridge University Press:  13 June 2019

COLETTE MOEGLIN  and
DAVID RENARD
COLETTE MOEGLIN
Affiliation:
CNRS, Institut mathématique de Jussieu email [email protected]
DAVID RENARD
Affiliation:
Centre de mathématiques Laurent Schwartz, École polytechnique email [email protected]
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Abstract

Soit $\unicode[STIX]{x1D70B}$ un module de plus haut poids unitaire du groupe $G=\mathbf{Sp}(2n,\mathbb{R})$. On s’intéresse aux paquets d’Arthur contenant $\unicode[STIX]{x1D70B}$. Lorsque le plus haut poids est scalaire, on détermine les paramètres de ces paquets, on établit la propriété de multiplicité $1$ de $\unicode[STIX]{x1D70B}$ dans le paquet, et l’on calcule le caractère $\unicode[STIX]{x1D70C}_{\unicode[STIX]{x1D70B}}$ (du groupe des composantes connexes du centralisateur du paramètre dans le groupe dual) associé à $\unicode[STIX]{x1D70B}$ et qui joue un grand rôle dans la théorie d’Arthur. On fait de même pour certains modules de plus haut poids unitaires unipotents $\unicode[STIX]{x1D70E}_{n,k}$, ou bien lorsque le caractère infinitésimal est régulier.

Let $\unicode[STIX]{x1D70B}$ be an irreducible unitary highest weight module for $G=\mathbf{Sp}(2n,\mathbb{R})$. We would like to determine the Arthur packets containing $\unicode[STIX]{x1D70B}$. When the highest weight is scalar, we determine the Arthur parameter of these packets, we establish the multiplicity one property of $\unicode[STIX]{x1D70B}$ in the packet and we compute the character $\unicode[STIX]{x1D70C}_{\unicode[STIX]{x1D70B}}$ (of the group of connected components of the centralizer of $\unicode[STIX]{x1D713}$ in the dual group) associated to $\unicode[STIX]{x1D70B}$ which plays an important role in Arthur’s theory. We also deal with the case of some unipotent unitary highest weight modules $\unicode[STIX]{x1D70E}_{n,k}$, or when the infinitesimal character is regular.

MSC classification

Primary: 22E50: Representations of Lie and linear algebraic groups over local fields
Type
Article
Information
Nagoya Mathematical Journal , Volume 241 , March 2021 , pp. 44 - 124
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Copyright
© 2019 Foundation Nagoya Mathematical Journal

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Footnotes

Le second auteur a bénéficié d’une aide de l’Agence nationale de la recherche ANR-13-BS01-0012 FERPLAY.

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