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We establish a transfer of unitarity for a Bernstein component of the category of smooth representations of a reductive p-adic group to the associated Hecke algebra, in the framework of the theory of types, whenever the Hecke algebra is an…

Representation Theory · Mathematics 2011-04-11 Dan Barbasch , Dan Ciubotaru

We construct three-variable $p$-adic families of Galois cohomology classes attached to Rankin convolutions of modular forms, and prove an explicit reciprocity law relating these classes to critical values of L-functions. As a consequence,…

Number Theory · Mathematics 2023-11-23 Guido Kings , David Loeffler , Sarah Livia Zerbes

We study $p$-adic Hodge theory for families of Galois representations over pseudorigid spaces. Such spaces are non-archimedean analytic spaces which may be of mixed characteristic, and which arise naturally in the study of eigenvarieties at…

Number Theory · Mathematics 2022-11-07 Rebecca Bellovin

In this paper we extend a conjecture of Ash and Sinnott relating niveau one Galois representation to the mod p cohomology of congruence subgroups of SL(n,Z) to include Galois representations of higher niveau. We then present computational…

Number Theory · Mathematics 2007-05-23 Avner Ash , Darrin Doud , David Pollack

We derive an explicit upper bound for the number of systems of Hecke eigenvalues coming from Siegel modular forms (mod p) of dimension g and level N relatively prime to p. In the special case of elliptic modular forms (g=1), our result…

Number Theory · Mathematics 2007-05-23 Alexandru Ghitza

We identify the dominant part of the Frenkel-Reshetikhin $q$-character with a natural invariant arising from the Langlands/Zelevinsky parameterization for affine Hecke algebras. We introduce the reciprocal character of a module over a…

Representation Theory · Mathematics 2026-05-25 Maxim Gurevich , Angelina Vargulevich

We consider the Galois representation associated with a finite slope $p$-adic family of modular forms. We prove that the Lie algebra of its image contains a congruence Lie subalgebra of a non-trivial level. We describe the largest such…

Number Theory · Mathematics 2016-12-09 Andrea Conti , Adrian Iovita , Jacques Tilouine

We describe an algorithm for enumerating the set of level 1 systems of Hecke eigenvalues arising from modular forms (mod p).

Number Theory · Mathematics 2019-02-20 Craig Citro , Alexandru Ghitza

We prove that certain Galois-isotypic parts of the completed cohomology group for U(2) can be written as a completed tensor product of a representation coming from the p-adic Langlands correspondence for $GL_2(\mathbb{Q}_p)$ and a…

Number Theory · Mathematics 2014-06-10 Przemyslaw Chojecki , Claus Sorensen

We count points over a finite field on wild character varieties of Riemann surfaces for singularities with regular semisimple leading term. The new feature in our counting formulas is the appearance of characters of Yokonuma-Hecke algebras.…

Algebraic Geometry · Mathematics 2016-05-24 Tamas Hausel , Martin Mereb , Michael Lennox Wong

We survey some of the known results on the relation between the homology of the {\em full} Hecke algebra of a reductive $p$-adic group $G$, and the representation theory of $G$. Let us denote by $\CIc(G)$ the full Hecke algebra of $G$ and…

K-Theory and Homology · Mathematics 2007-05-23 Victor Nistor

We study deformation theory of mod $p$ Galois representations of $p$-adic fields with values in generalised reductive group schemes, such as $L$-groups and $C$-groups. We show that the corresponding deformation rings are complete…

Number Theory · Mathematics 2026-05-06 Vytautas Paškūnas , Julian Quast

We construct extensions of the field of rational numbers with the Galois group G_2(F_p) by reducing p-adic representations attached to automorphic representations.

Number Theory · Mathematics 2014-06-17 Kay Magaard , Gordan Savin

We equip the type $A$ diagrammatic Hecke category with a special derivation, so that after specialization to characteristic $p$ it becomes a $p$-dg category. We prove that the defining relations of the Hecke algebra are satisfied in the…

Representation Theory · Mathematics 2023-11-30 Ben Elias , You Qi

This article is the first part of a series of three articles about compatible systems of symplectic Galois representations and applications to the inverse Galois problem. In this first part, we determine the smallest field over which the…

Number Theory · Mathematics 2013-09-24 Sara Arias-de-Reyna , Luis Dieulefait , Gabor Wiese

We consider limits of p-adic Galois representations, study different notions of convergence for such representations, and prove Cebotarev-type density theorems for them.

Number Theory · Mathematics 2007-05-23 Joel Bellaiche , Gaetan Chenevier , Chandrashekhar Khare , Michael Larsen

In this paper we show that two dimensional (mod p) Galois representations satisfying mild hypotheses can be lifted to p-adic Galois representations ramified at infinitely many primes such that the characteristic polynomials of Frobenius at…

Number Theory · Mathematics 2007-05-23 Chandrashekhar Khare , Michael Larsen , Ravi Ramakrishna

Let $F$ be a totally real field in which $p$ is unramified. Let $\overline{r}: G_F \rightarrow \mathrm{GL}_2(\overline{\mathbb{F}}_p)$ be a modular Galois representation which satisfies the Taylor--Wiles hypotheses and is tamely ramified…

Number Theory · Mathematics 2023-04-25 Daniel Le , Stefano Morra , Benjamin Schraen

In 1976, Deligne and Lusztig realized the representation theory of finite groups of Lie type inside \'etale cohomology of certain algebraic varieties. Recently, a $p$-adic version of this theory started to emerge: there are $p$-adic…

Representation Theory · Mathematics 2024-10-10 Jakub Löwit

We classify and explicitly construct the irreducible graded representations of anti-spherical Hecke categories which are concentrated in one degree. Each of these homogeneous representations is one-dimensional and can be cohomologically…

Representation Theory · Mathematics 2023-01-20 Chris Bowman , Amit Hazi , Emily Norton
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