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International Mathematics Research Notices Advance Access published online on October 23, 2009

International Mathematics Research Notices, doi:10.1093/imrn/rnp150
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Correspondance de Langlands et Fonctions L des carrés Extérieur et Symétrique

Guy Henniart

Guy Henniart, Université Paris–Sud, Département de Mathématiques et UMR 8628 du CNRS, Orsay Cedex F–91405, France

Correspondence: Correspondence to be sent to: guy.henniart{at}math.u-psud.fr

Soient p un nombre premier, F une extension finie de Qp, et {psi} un caractère additif non trivial de F. La correspondance de Langlands donne une bijection {sigma} ↦ {pi} ({sigma}) entre les représentations {Phi}–semisimples de dimension n du groupe de Weil–Deligne de F, à isomorphisme près, et les représentations lisses irréductibles de Formula , à isomorphisme près. Pour certaines représentations r du groupe dual Formula de Formula , on sait associer, par voie globale, à une représentation lisse irréductible {pi} de Formula , des facteurs L({pi}, r, s) et {varepsilon} ({pi}, r, s, {psi}). On conjecture l’égalité L({pi} ({sigma}), r, s) = L (r {circ} {sigma}, s), et de même pour les facteurs {varepsilon}, quand {sigma} est une représentation de dimension n du groupe de Weil–Deligne de F. Répondant à une question de D. Jiang et D. Soudry, nous prouvons que si r = {Lambda}2 ou Formula , on a L({pi} ({sigma}), r, s) = L (r {circ} {sigma}, s) et {varepsilon} ({pi} ({sigma}), r, s, {psi}) = {alpha} {varepsilon} (r {circ} {sigma}, s, {psi}), où {alpha} est une racine de l’unité.

(Langlands correspondence and L–functions for the exterior and symmetric squares) Let p be a prime number, F a finite extension of Qp and {psi} a non trivial additive character of F. The Langlands correspondence is a bijection {sigma} ↦ {pi} ({sigma}) between {Phi}-semisimple degree n representations of the Weil–Deligne group of F, up to isomorphism, and smooth irreducible representations of Formula , up to isomorphism. For some representations r of the dual group Formula of Formula , local-global methods attach factors L({pi}, r, s) and {varepsilon} ({pi}, r, s, {psi}) to any smooth irreducible representation {pi} of Formula . Conjecturally we have L({pi} ({sigma}), r, s) = L (r {circ} {sigma}, s), and similarly for the {varepsilon}-factors, when {sigma} is a degree n representation of the Weil–Deligne group of F.


Communicated by Prof. Freydoon Shahidi


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