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We study the weight part of (a generalisation of) Serre's conjecture for mod l Galois representations associated to automorphic representations on rank two unitary groups for odd primes l. We propose a conjectural set of Serre weights,…

Number Theory · Mathematics 2011-06-29 Thomas Barnet-Lamb , Toby Gee , David Geraghty

We prove the compatibility of the local and global Langlands correspondences at places dividing l for the l-adic Galois representations associated to regular algebraic conjugate self-dual cuspidal automorphic representations of GL_n over an…

Number Theory · Mathematics 2011-05-12 Thomas Barnet-Lamb , Toby Gee , David Geraghty , Richard Taylor

We prove the weight part of Serre's conjecture for Galois representations valued in $\mathrm{GSp}_4$ that are tamely ramified with explicit genericity at places above $p$ as conjectured by Herzig--Tilouine and Gee--Herzig--Savitt. This…

Number Theory · Mathematics 2025-10-07 Daniel Le , Bao V. Le Hung , Heejong Lee

We show the Gersten's conjecture for \'etale cohomology over two dimensional henselian regular local rings without assuming equi-characteristic. As application, we obtain the local-global principle for Galois cohomology over mixed…

Number Theory · Mathematics 2020-03-31 Makoto Sakagaito

We formulate a Serre-type conjecture for n-dimensional Galois representations that are tamely ramified at p. The weights are predicted using a representation-theoretic recipe. For n = 3 some of these weights were not predicted by the…

Number Theory · Mathematics 2019-12-19 Florian Herzig

Drinfeld in 2010 proved the companions conjecture for smooth varieties over a finite field, generalizing L. Lafforgue's result for smooth curves. We study the obstruction to prove the conjecture for arbitrary normal varieties. To do this,…

Number Theory · Mathematics 2025-04-14 Marco D'Addezio

We prove some new cases of weight part of Serre's conjectures for mod $p$ Galois representations associated to automorphic representations on unitary groups $U(d)$. The approach is a generalization of the work of Gee-Liu-Savitt, namely, we…

Number Theory · Mathematics 2019-05-21 Hui Gao

Let F be a totally real field, and v a place of F dividing an odd prime p. We study the weight part of Serre's conjecture for continuous, totally odd, two-dimensional mod p representations rhobar of the absolute Galois group of F that are…

Number Theory · Mathematics 2015-06-10 Fred Diamond , David Savitt

Gouv\^ea-Mazur [GM] made a conjecture on the local constancy of slopes of modular forms when the weight varies $p$-adically. Since one may decompose the space of modular forms according to associated residual Galois representations, the…

Number Theory · Mathematics 2024-04-02 Rufei Ren

Here we follow on the proposed generalization of Maeda's conjecture made in [2]. We report on computations that suggest a relation between the number of local types and the number of non-CM newform Galois orbits. We extend the conjecture…

Number Theory · Mathematics 2016-08-19 Luis Dieulefait , Panagiotis Tsaknias

A generalization of Serre's Conjecture asserts that if $F$ is a totally real field, then certain characteristic $p$ representations of Galois groups over $F$ arise from Hilbert modular forms. Moreover it predicts the set of weights of such…

Number Theory · Mathematics 2017-12-13 Lassina Dembele , Fred Diamond , David P. Roberts

The conjecture of Serre referred in the title is the one about modularity of odd Galois representations into GL(2,F) where F is a finite field of characteristic p. We present an analogous conjecture where GL(2) is replaced by GL(n). We…

Number Theory · Mathematics 2007-05-23 Avner Ash , Warren Sinnott

We prove exceptional zero conjectures for $p$-ordinary regular algebraic cuspidal automorphic representations of $\mathrm{GL}_3(\mathbb{A})$ which are Steinberg at $p$. We make no self-duality assumptions. The paper has two parts. In Part…

Number Theory · Mathematics 2025-10-01 Daniel Barrera Salazar , Andrew Graham , Chris Williams

Let $\rho_1$ and $\rho_2$ be a pair of residual, odd, absolutely irreducible two-dimensional Galois representations of a totally real number field $F$. In this article we propose a conjecture asserting existence of "safe" chains of…

Number Theory · Mathematics 2014-08-29 Luis Dieulefait , Ariel Pacetti

Let p be a prime and F a totally real field in which p is unramified. We consider mod p Hilbert modular forms for F, defined as sections of automorphic line bundles on Hilbert modular varieties of level prime to p in characteristic p. For a…

Number Theory · Mathematics 2022-11-15 Fred Diamond , Shu Sasaki

In 1987 Serre conjectured that any mod l ("ell", not "1") two-dimensional irreducible odd representation of the absolute Galois group of the rationals came from a modular form in a precise way. We present a generalisation of this conjecture…

Number Theory · Mathematics 2019-12-19 Kevin Buzzard , Fred Diamond , Frazer Jarvis

In this paper we formulate a conjecture on the relationship between the equivariant \epsilon-constants (associated to a local p-adic representation V and a finite extension of local fields L/K) and local Galois cohomology groups of a Galois…

Number Theory · Mathematics 2013-09-19 Dmitriy Izychev , Otmar Venjakob

Under some technical assumptions of a global nature, we establish the weight part of Serre's conjecture for mod $p$ Galois representations for CM fields that are tamely ramified and sufficiently generic at $p$.

Number Theory · Mathematics 2025-09-24 Daniel Le , Bao V. Le Hung

We can associate an admissible unitary representation $\Pi(\rho_p)$ of $\GL_2(\Q_p)$ with every local Galois representation $\rho_p$ by the $p$-adic local Langlands correspondence. If $\rho_p$ is ordinary, we prove local and global…

Number Theory · Mathematics 2026-05-18 Debargha Banerjee , Srijan Das

The Local Converse Problem is to determine how the family of the local gamma factors $\gamma(s,\pi\times\tau,\psi)$ characterizes the isomorphism class of an irreducible admissible generic representation $\pi$ of $\mathrm{GL}_n(F)$, with…

Number Theory · Mathematics 2015-04-14 Dihua Jiang , Chufeng Nien , Shaun Stevens