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We prove a conjecture of Hiraga-Ichino-Ikeda relating formal degrees of square-integrable representations to adjoint gamma factors for symplectic and even orthogonal groups over characteristic zero non-Archimedean local fields. The proof is…

Representation Theory · Mathematics 2025-08-13 Raphaël Beuzart-Plessis

In this article, we will prove that the formal degree conjecture is compatible with the Deligne-Kazhdan correspondence for quasi-split groups, assuming that the local Langlands correspondence is compatible with the Deligne-Kazhdan…

Representation Theory · Mathematics 2026-05-26 Anantha Krishna B

The formal degree conjecture relates the formal degree of an irreducible square-integrable representation of a reductive group over a local field to the special value of the adjoint $\gamma$-factor of its $L$-parameter. In this paper, we…

Number Theory · Mathematics 2017-10-18 Atsushi Ichino , Erez Lapid , Zhengyu Mao

Let (G,H) be one of the equal rank reductive dual pairs (Mp_{2n},O_{2n+1}) or (U_n,U_n) over a non-archimedean local field of characteristic zero. It is well-known that the theta correspondence establishes a bijection between certain…

Representation Theory · Mathematics 2024-07-18 Bram Mesland , Mehmet Haluk Sengun

We complete the proof of the Howe duality conjecture in the theory of local theta correspondence by treating the remaining case of quaternionic dual pairs in arbitrary residual characteristic.

Representation Theory · Mathematics 2015-07-17 Wee Teck Gan , Binyong Sun

We study the validity of the local theta correspondence over a non-archimedean local field in the context of modular representation theory \textit{i.e.} for representations with coefficient fields of positive characteristic. For a…

Representation Theory · Mathematics 2025-07-16 Justin Trias

Lapid and Mao formulated a conjecture on an explicit formula of Whittaker Fourier coefficients of automorphic forms on quasi-split classical groups and metaplectic groups as an analogue of Ichino-Ikeda conjecture. They also showed that this…

Number Theory · Mathematics 2019-02-14 Kazuki Morimoto

In this paper, we formulate a conjecture that describes the local theta correspondences in terms of the local Langland correspondences for rigid inner twists, which contain the correspondences for quaternionic dual pairs. Moreover, we…

Representation Theory · Mathematics 2025-04-16 Hirotaka Kakuhama

We study the algebraic framework in which one can define, in the manner of the theta correspondence, a correspondence between representations of two locally profinite groups $H_1$, $H_2$. In particular, we examine when and how such a…

Representation Theory · Mathematics 2021-03-05 Chun-Hui Wang

An "automatic continuity" question has naturally occurred since Roger Howe established the local theta correspondence over $\mathbb R$: does the algebraic version of local theta correspondence over $\mathbb R$ agrees with the smooth…

Representation Theory · Mathematics 2016-11-22 Yixin Bao , Binyong Sun

Let $\mathcal{G}$ be a quasi-split connected reductive group over a non-archimedean local field $F.$ In this paper, we prove the formal degree conjecture for discrete series representations contained in a principal series of…

Representation Theory · Mathematics 2026-04-17 Giulio Ricci

For square-integrable genuine Iwahori-spherical representations of central covers, we verify the Hiraga--Ichino--Ikeda formula for their formal degrees. We also compute the Whittaker dimensions of these representations, when their…

Representation Theory · Mathematics 2023-05-16 Ping Dong , Fan Gao , Runze Wang

Let V be a rational quadratic space of signature (m,2). A conjecture of Kudla relates the arithmetic degrees of top degree special cycles on an integral model of a Shimura variety associated with SO(V) to the coefficients of the central…

Number Theory · Mathematics 2019-11-27 Jan Hendrik Bruinier , Tonghai Yang

During the last two decades, great efforts have been devoted to the calculation of the local theta correspondence for reductive dual pairs. However, uniform formulas remain elusive for real dual pairs of type I. The purpose of this paper is…

Representation Theory · Mathematics 2018-01-04 Xiang Fan

The theta correspondence has been an important tool in studying cycles in locally symmetric spaces of orthogonal type. We generalize the Kudla-Millson relation between intersection numbers of cycles and Fourier coefficients of Siegel…

Number Theory · Mathematics 2007-05-23 Jens Funke , John Millson

In this article we prove an arithmetic level raising theorem for the symplectic group of degree four in the ramified case. This result is a key step towards the Beilinson-Bloch-Kato conjecture for certain Rankin-Selberg motives associated…

Number Theory · Mathematics 2026-05-15 Haining Wang

Let G be a reductive p-adic group which splits over an unramified extension of the ground field. Hiraga, Ichino and Ikeda conjectured that the formal degree of a square-integrable G-representation $\pi$ can be expressed in terms of the…

Representation Theory · Mathematics 2022-10-11 Yongqi Feng , Eric Opdam , Maarten Solleveld

We prove Kudla-Rallis conjecture on first occurrences of local theta correspondence, for all type I irreducible dual pairs and all local fields of characteristic zero.

Representation Theory · Mathematics 2014-06-03 Binyong Sun , Chen-Bo Zhu

We work out the exact relationship between algebraic modular forms for a two-by-two general unitary group over a definite quaternion algebra, and those arising from genera of positive-definite quinary lattices, relating stabilisers of local…

Number Theory · Mathematics 2021-12-08 Neil Dummigan , Ariel Pacetti , Gustavo Rama , Gonzalo Tornaría

Supercuspidal representations are usually infinite-dimensional, so the size of such a representation cannot be measured by its dimension; the formal degree is a better alternative. Hiraga, Ichino, and Ikeda conjectured a formula for the…

Representation Theory · Mathematics 2021-01-05 David Schwein
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