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Search: MSC category 22E50 ( Representations of Lie and linear algebraic groups over local fields [See also 20G05] )

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26. CJM 2006 (vol 58 pp. 1229)

Henniart, Guy; Lemaire, Bertrand
Intégrales orbitales tordues sur $\GL(n,F)$ et corps locaux proches\,: applications
Soient $F$ un corps commutatif localement compact non archim\'edien, $G=\GL (n,F)$ pour un entier $n\geq 2$, et $\kappa$ un caract\`ere de $F^\times$ trivial sur $(F^\times)^n$. On prouve une formule pour les $\kappa$-int\'egrales orbitales r\'eguli\`eres sur $G$ permettant, si $F$ est de caract\'eristique $>0$, de les relever \`a la caract\'eristique nulle. On en d\'eduit deux r\'esultats nouveaux en caract\'eristique $>0$\,: le ``lemme fondamental'' pour l'induction automorphe, et une version simple de la formule des traces tordue locale d'Arthur reliant $\kappa$-int\'egrales orbitales elliptiques et caract\`eres $\kappa$-tordus. Cette formule donne en particulier, pour une s\'erie $\kappa$-discr\`ete de $G$, les $\kappa$-int\'egrales orbitales elliptiques d'un pseudo-coefficient comme valeurs du caract\`ere $\kappa$-tordu.

Keywords:corps local, représentation lisse, intégrale orbitale tordue, induction automorphe, lemme fondamental, formule des traces locale, pseudo-coefficient

27. CJM 2006 (vol 58 pp. 1203)

Heiermann, Volker
Orbites unipotentes et pôles d'ordre maximal de la fonction $\mu $ de Harish-Chandra
Dans un travail ant\'erieur, nous avions montr\'e que l'induite parabolique (normalis\'ee) d'une repr\'esentation irr\'eductible cuspidale $\sigma $ d'un sous-groupe de Levi $M$ d'un groupe $p$-adique contient un sous-quotient de carr\'e int\'egrable, si et seulement si la fonction $\mu $ de Harish-Chandra a un p\^ole en $\sigma $ d'ordre \'egal au rang parabolique de $M$. L'objet de cet article est d'interpr\'eter ce r\'esultat en termes de fonctorialit\'e de Langlands.

Categories:11F70, 11F80, 22E50

28. CJM 2006 (vol 58 pp. 1095)

Sakellaridis, Yiannis
A Casselman--Shalika Formula for the Shalika Model of $\operatorname{GL}_n$
The Casselman--Shalika method is a way to compute explicit formulas for periods of irreducible unramified representations of $p$-adic groups that are associated to unique models (i.e., multiplicity-free induced representations). We apply this method to the case of the Shalika model of $GL_n$, which is known to distinguish lifts from odd orthogonal groups. In the course of our proof, we further develop a variant of the method, that was introduced by Y. Hironaka, and in effect reduce many such problems to straightforward calculations on the group.

Keywords:Casselman--Shalika, periods, Shalika model, spherical functions, Gelfand pairs
Categories:22E50, 11F70, 11F85

29. CJM 2006 (vol 58 pp. 344)

Goldberg, David
Reducibility for $SU_n$ and Generic Elliptic Representations
We study reducibility of representations parabolically induced from discrete series representations of $SU_n(F)$ for $F$ a $p$-adic field of characteristic zero. We use the approach of studying the relation between $R$-groups when a reductive subgroup of a quasi-split group and the full group have the same derived group. We use restriction to show the quotient of $R$-groups is in natural bijection with a group of characters. Applying this to $SU_n(F)\subset U_n(F)$ we show the $R$ group for $SU_n$ is the semidirect product of an $R$-group for $U_n(F)$ and this group of characters. We derive results on non-abelian $R$-groups and generic elliptic representations as well.

Categories:22E50, 22E35

30. CJM 2005 (vol 57 pp. 159)

Jantzen, Chris
Duality and Supports of Induced Representations for Orthogonal Groups
In this paper, we construct a duality for $p$-adic orthogonal groups.


31. CJM 2003 (vol 55 pp. 353)

Silberger, Allan J.; Zink, Ernst-Wilhelm
Weak Explicit Matching for Level Zero Discrete Series of Unit Groups of $\mathfrak{p}$-Adic Simple Algebras
Let $F$ be a $p$-adic local field and let $A_i^\times$ be the unit group of a central simple $F$-algebra $A_i$ of reduced degree $n>1$ ($i=1,2$). Let $\mathcal{R}^2 (A_i^\times)$ denote the set of irreducible discrete series representations of $A_i^\times$. The ``Abstract Matching Theorem'' asserts the existence of a bijection, the ``Jacquet-Langlands'' map, $\mathcal{J} \mathcal{L}_{A_2,A_1} \colon \mathcal{R}^2 (A_1^\times) \to \mathcal{R}^2 (A_2^\times)$ which, up to known sign, preserves character values for regular elliptic elements. This paper addresses the question of explicitly describing the map $\mathcal{J} \mathcal{L}$, but only for ``level zero'' representations. We prove that the restriction $\mathcal{J} \mathcal{L}_{A_2,A_1} \colon \mathcal{R}_0^2 (A_1^\times) \to \mathcal{R}_0^2 (A_2^\times)$ is a bijection of level zero discrete series (Proposition~3.2) and we give a parameterization of the set of unramified twist classes of level zero discrete series which does not depend upon the algebra $A_i$ and is invariant under $\mathcal{J} \mathcal{L}_{A_2,A_1}$ (Theorem~4.1).

Categories:22E50, 11R39

32. CJM 2002 (vol 54 pp. 92)

Mezo, Paul
Comparisons of General Linear Groups and their Metaplectic Coverings I
We prepare for a comparison of global trace formulas of general linear groups and their metaplectic coverings. In particular, we generalize the local metaplectic correspondence of Flicker and Kazhdan and describe the terms expected to appear in the invariant trace formulas of the above covering groups. The conjectural trace formulas are then placed into a form suitable for comparison.

Categories:11F70, 11F72, 22E50

33. CJM 2001 (vol 53 pp. 1141)

Bushnell, Colin J.; Henniart, Guy
Sur le comportement, par torsion, des facteurs epsilon de paires
Soient $F$ un corps commutatif localement compact non archim\'edien et $\psi$ un caract\`ere additif non trivial de $F$. Soient $n$ et $n'$ deux entiers distincts, sup\'erieurs \`a $1$. Soient $\pi$ et $\pi'$ des repr\'esentations irr\'eductibles supercuspidales de $\GL_n(F)$, $\GL_{n'}(F)$ respectivement. Nous prouvons qu'il existe un \'el\'ement $c= c(\pi,\pi',\psi)$ de $F^\times$ tel que pour tout quasicaract\`ere mod\'er\'e $\chi$ de $F^\times$ on ait $\varepsilon(\chi\pi\times \pi',s,\psi) = \chi(c)^{-1}\varepsilon(\pi\times\pi',s,\psi)$. Nous examinons aussi certains cas o\`u $n=n'$, $\pi'=\pi^\vee$. Les r\'esultats obtenus forment une \'etape vers une d\'emonstration de la conjecture de Langlands pour $F$, qui ne fasse pas appel \`a la g\'eom\'etrie des vari\'et\'es modulaires, de Shimura ou de Drinfeld. Let $F$ be a non-Archimedean local field, and $\psi$ a non-trivial additive character of $F$. Let $n$ and $n'$ be distinct positive integers. Let $\pi$, $\pi'$ be irreducible supercuspidal representations of $\GL_n(F)$, $\GL_{n'}(F)$ respectively. We prove that there is $c= c(\pi,\pi',\psi)\in F^\times$ such that for every tame quasicharacter $\chi$ of $F^\times$ we have $\varepsilon(\chi\pi\times \pi',s,\psi) = \chi(c)^{-1}\varepsilon(\pi\times\pi',s,\psi)$. We also treat some cases where $n=n'$ and $\pi'=\pi^\vee$. These results are steps towards a proof of the Langlands conjecture for $F$, which would not use the geometry of modular---Shimura or Drinfeld---varieties.

Keywords:corps local, correspondance de Langlands locale, facteurs epsilon de paires

34. CJM 2001 (vol 53 pp. 675)

Ban, Dubravka
Jacquet Modules of Parabolically Induced Representations and Weyl Groups
The representation parabolically induced from an irreducible supercuspidal representation is considered. Irreducible components of Jacquet modules with respect to induction in stages are given. The results are used for consideration of generalized Steinberg representations.


35. CJM 2001 (vol 53 pp. 244)

Goldberg, David; Shahidi, Freydoon
On the Tempered Spectrum of Quasi-Split Classical Groups II
We determine the poles of the standard intertwining operators for a maximal parabolic subgroup of the quasi-split unitary group defined by a quadratic extension $E/F$ of $p$-adic fields of characteristic zero. We study the case where the Levi component $M \simeq \GL_n (E) \times U_m (F)$, with $n \equiv m$ $(\mod 2)$. This, along with earlier work, determines the poles of the local Rankin-Selberg product $L$-function $L(s, \tau' \times \tau)$, with $\tau'$ an irreducible unitary supercuspidal representation of $\GL_n (E)$ and $\tau$ a generic irreducible unitary supercuspidal representation of $U_m (F)$. The results are interpreted using the theory of twisted endoscopy.

Categories:22E50, 11S70

36. CJM 2000 (vol 52 pp. 804)

Kottwitz, Robert E.; Rogawski, Jonathan D.
The Distributions in the Invariant Trace Formula Are Supported on Characters
J.~Arthur put the trace formula in invariant form for all connected reductive groups and certain disconnected ones. However his work was written so as to apply to the general disconnected case, modulo two missing ingredients. This paper supplies one of those missing ingredients, namely an argument in Galois cohomology of a kind first used by D.~Kazhdan in the connected case.

Categories:22E50, 11S37, 10D40

37. CJM 2000 (vol 52 pp. 449)

Adler, Jeffrey D.; Roche, Alan
An Intertwining Result for $p$-adic Groups
For a reductive $p$-adic group $G$, we compute the supports of the Hecke algebras for the $K$-types for $G$ lying in a certain frequently-occurring class. When $G$ is classical, we compute the intertwining between any two such $K$-types.

Categories:22E50, 20G05

38. CJM 2000 (vol 52 pp. 539)

Jantzen, Chris
On Square-Integrable Representations of Classical $p$-adic Groups
In this paper, we use Jacquet module methods to study the problem of classifying discrete series for the classical $p$-adic groups $\Sp(2n,F)$ and $\SO(2n+1,F)$.


39. CJM 2000 (vol 52 pp. 306)

Cunningham, Clifton
Characters of Depth-Zero, Supercuspidal Representations of the Rank-2 Symplectic Group
This paper expresses the character of certain depth-zero supercuspidal representations of the rank-2 symplectic group as the Fourier transform of a finite linear combination of regular elliptic orbital integrals---an expression which is ideally suited for the study of the stability of those characters. Building on work of F.~Murnaghan, our proof involves Lusztig's Generalised Springer Correspondence in a fundamental way, and also makes use of some results on elliptic orbital integrals proved elsewhere by the author using Moy-Prasad filtrations of $p$-adic Lie algebras. Two applications of the main result are considered toward the end of the paper.

Categories:22E50, 22E35

40. CJM 1999 (vol 51 pp. 130)

Savin, Gordan; Gan, Wee Teck
The Dual Pair $G_2 \times \PU_3 (D)$ ($p$-Adic Case)
We study the correspondence of representations arising by restricting the minimal representation of the linear group of type $E_7$ and relative rank $4$. The main tool is computations of the Jacquet modules of the minimal representation with respect to maximal parabolic subgroups of $G_2$ and $\PU_3(D)$.

Categories:22E35, 22E50, 11F70

41. CJM 1999 (vol 51 pp. 164)

Tan, Victor
Poles of Siegel Eisenstein Series on $U(n,n)$
Let $U(n,n)$ be the rank $n$ quasi-split unitary group over a number field. We show that the normalized Siegel Eisenstein series of $U(n,n)$ has at most simple poles at the integers or half integers in certain strip of the complex plane.

Categories:11F70, 11F27, 22E50

42. CJM 1998 (vol 50 pp. 1105)

Roberts, Brooks
Tempered representations and the theta correspondence
Let $V$ be an even dimensional nondegenerate symmetric bilinear space over a nonarchimedean local field $F$ of characteristic zero, and let $n$ be a nonnegative integer. Suppose that $\sigma \in \Irr \bigl(\OO (V)\bigr)$ and $\pi \in \Irr \bigl(\Sp (n,F)\bigr)$ correspond under the theta correspondence. Assuming that $\sigma$ is tempered, we investigate the problem of determining the Langlands quotient data for $\pi$.

Categories:11F27, 22E50
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