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In [HJLLZ24], we proposed a new conjecture on the structure of the unitary dual of connected reductive groups over non-Archimedean local fields of characteristic zero based on their Arthur representations and verified it for all the known…

Representation Theory · Mathematics 2025-05-26 Alexander Hazeltine , Dihua Jiang , Baiying Liu , Chi-Heng Lo , Qing Zhang

This article is part of a project which consists of investigating Arthur packets for real classical groups. Our goal is to give an explicit description of these packets and to establish the multiplicity one property (which is known to hold…

Representation Theory · Mathematics 2019-01-11 Colette Moeglin , David Renard

In this paper, we highlight and state precisely the local Langlands correspondence for quasi-split O_{2n} established by Arthur. We give two applications: Prasad's conjecture and Gross--Prasad conjecture for O_{n}. Also, we discuss the…

Number Theory · Mathematics 2016-02-04 Hiraku Atobe , Wee Teck Gan

Arthur packets have been defined for pure real forms of symplectic and special orthogonal groups following two different approaches. The first approach, due to Arthur, Moeglin and Renard uses harmonic analysis. The second approach, due to…

Representation Theory · Mathematics 2026-01-14 Nicolas Arancibia Robert , Paul Mezo

We present a finite algorithm for computing the set of irreducible unitary representations of a real reductive group G. The Langlands classification, as formulated by Knapp and Zuckerman, exhibits any representation with an invariant…

Representation Theory · Mathematics 2017-10-16 Jeffrey Adams , Marc van Leeuwen , Peter Trapa , David A. Vogan

We determine the number of local Arthur packets containing a certain fixed tempered representation for classical $p$-adic groups. More specifically, given a tempered extended multi-segment supported in the integers, we determine a count for…

Representation Theory · Mathematics 2026-02-16 Alexander Hazeltine , Aarya Kumar , Andrew Tung

We compute special unipotent Arthur packets for real reductive groups in many cases. We list the cases that lead to incomplete answers, and in those cases, provide a suitable set of representations that could lead to a complete description…

Representation Theory · Mathematics 2018-11-16 Jonathan Fernandes

In [J14], a conjecture was proposed on a relation between the global Arthur parameters and the structure of Fourier coefficients of the automorphic representations in the corresponding global Arthur packets. In this paper, we discuss the…

Number Theory · Mathematics 2014-12-25 Dihua Jiang , Baiying Liu

If one proposes to use the theory of Eisenstein cohomology to prove algebraicity results for the special values of automorphic L-functions as in my work with Harder for Rankin-Selberg L-functions, or its generalizations as in my work with…

Number Theory · Mathematics 2021-06-03 A. Raghuram

The theme of the article is the study of the unipotent part of Arthur's trace formula for general linear groups. The case of regular (or "regular by blocks") unipotent orbits has been essentially done in a previous paper. Here we are…

Representation Theory · Mathematics 2014-11-13 Pierre-Henri Chaudouard

The set of special unipotent representations of a semisimple Lie group was defined by Barbasch and Vogan. According to predictions of Arthur (established by Adams, Barbasch, and Vogan), this set is an overlapping union of Arthur packets.…

Representation Theory · Mathematics 2011-06-22 Dan M. Barbasch , Peter E. Trapa

In this paper we prove Vogan's conjecture on local Arthur packets, for Arthur parameters of $p$-adic general linear groups that are irreducible as representations of $W_F \times SL_2(\mathbb{C}) \times SL_2(\mathbb{C})$ - we refer to such…

Representation Theory · Mathematics 2022-10-11 Clifton Cunningham , Mishty Ray

Let G be an even orthogonal or unitary group over a number field. Based on the same observation used in arXiv:1705.10106, we prove the Arthur's multiplicity formula for the generic part of the automorphic discrete spectrum of G by using the…

Number Theory · Mathematics 2024-10-22 Rui Chen , Jialiang Zou

Let $F$ be a $p$-adic field, and let $G$ be either the split special orthogonal group $\mathrm{SO}_{2n+1}(F)$ or the symplectic group $\mathrm{Sp}_{2n}(F)$, with $n \geq 0$. We prove that a smooth irreducible representation of good parity…

Representation Theory · Mathematics 2025-05-16 Hiraku Atobe , Alberto Minguez

Nous \'etendons aux groupes orthogonaux et unitaires non quasi-d\'eploy\'es sur un corps local des r\'esultats de J. Arthur et de la premi\`ere auteure \'etablis dans le cas quasi-d\'eploy\'e. En particulier, nous obtenons une…

Representation Theory · Mathematics 2018-03-22 Colette Moeglin , David Renard

We classify the unitary representations with integral infinitesimal character in Lusztig's category of unipotent representations in the case when the geometric parameter space comes from the action of a Levi subgroup on the abelian…

Representation Theory · Mathematics 2025-10-15 Dan Ciubotaru

This paper serves as an attempt towards the Jiang conjecture on the upper bound nilpotent orbits in the wavefront sets of representations in local Arthur packets of quasi-split classical groups, which is a natural generalization of the…

Representation Theory · Mathematics 2026-05-07 Baiying Liu , Freydoon Shahidi

In the paper we begin to explore relation between the question of unitarizability of classical p-adic groups, and Arthur packets.

Number Theory · Mathematics 2024-02-19 Marko Tadic

In this paper we prove the forward direction of the conjecture of Gross-Prasad that an L-packet $\Pi_\phi(G)$ contains a generic representation if and only if $L(s, \phi, \Ad)$ is regular at $s=1$, by assuming the local Langlands…

Representation Theory · Mathematics 2025-06-03 Kristaps Balodis , Clifton Cunningham , Andrew Fiori , Qing Zhang

We establish a fine expansion for the geometric part of the Arthur-Selberg trace formula (as it was conjectured by Werner Hoffmann). For the general linear group, we deduce an expression for the contributions of regular by blocks unipotent…

Representation Theory · Mathematics 2015-10-12 Pierre-Henri Chaudouard