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Let $X$ be a smooth scheme over a finite field of characteristic $p$. Consider the coefficient objects of locally constant rank on $X$ in $\ell$-adic Weil cohomology: these are lisse Weil sheaves in \'etale cohomology when $\ell \neq p$,…

Number Theory · Mathematics 2025-12-17 Kiran S. Kedlaya

In this paper, we introduce the notion of parabolic log convergent isocrystals on smooth varieties endowed with a simple normal crossing divisor, which is a kind of $p$-adic analogue of the notion of parabolic bundles on smooth varieties…

Number Theory · Mathematics 2012-06-27 Atsushi Shiho

We show that, over a nonarchimedean local field, the rigid refined local Langlands correspondence and associated endoscopic character identities for connected reductive $G$ follow if one only has them for all such $G$ with connected center.…

Representation Theory · Mathematics 2024-04-16 Peter Dillery

This paper surveys what is known about (conjectural) $p$-adic and $p$-modular semisimple Langlands correspondences in the non-supercuspidal setting for the unramified quasi-split unitary group…

Number Theory · Mathematics 2024-02-16 Ramla Abdellatif , Agnès David , Beth Romano , Hanneke Wiersema

In 2010 de Jong proposed a $p$-adic version of Gieseker's conjecture: if $X$ is a smooth, simply connected projective variety, then any isocrystal on $X$ is constant. This was proven by Esnault and Shiho under some additional assumptions.…

Algebraic Geometry · Mathematics 2018-02-07 Efstathia Katsigianni

We establish several new properties of the $p$-adic Jacquet-Langlands functor defined by Scholze in terms of the cohomology of the Lubin-Tate tower. In particular, we reprove Scholze's basic finiteness theorems, prove a duality theorem, and…

Number Theory · Mathematics 2022-07-12 David Hansen , Lucas Mann

We prove the overholonomicity of overconvergent $F$-isocrystals over smooth varieties. This implies that the notions of overholonomicity and devissability in overconvergent $F$-isocrystals are equivalent. Then the overholonomicity is stable…

Algebraic Geometry · Mathematics 2008-03-17 Daniel Caro , Nobuo Tsuzuki

Berthelot's conjecture predicts that under a proper and smooth morphism of schemes in characteristic $p$, the higher direct images of an overconvergent $F$-isocrystal are overconvergent $F$-isocrystals. In this paper we prove that this is…

Number Theory · Mathematics 2022-06-07 Valentina Di Proietto , Fabio Tonini , Lei Zhang

The Milnor conjecture has been a driving force in the theory of quadratic forms over fields, guiding the development of the theory of cohomological invariants, ushering in the theory of motivic cohomology, and touching on questions ranging…

Algebraic Geometry · Mathematics 2014-06-17 Asher Auel

We show a Lefschetz theorem for irreducible overconvergent $F$-isocrystals on smooth varieties defined over a finite field. We derive several consequences from it.

Algebraic Geometry · Mathematics 2016-07-26 Tomoyuki Abe , Hélène Esnault

We prove that a strengthened form of the local Langlands conjecture is valid throughout the principal series of any connected split reductive $p$-adic group. The method of proof is to establish the presence of a very simple geometric…

Representation Theory · Mathematics 2013-05-21 Anne-Marie Aubert , Paul Baum , Roger Plymen , Maarten Solleveld

We introduce an analogue of the Mertens conjecture for elliptic curves over finite fields. Using a result of Waterhouse, we classify the isogeny classes of elliptic curves for which this conjecture holds in terms the size of the finite…

Number Theory · Mathematics 2019-02-20 Peter Humphries

The Langlands Programme predicts that a weight 2 newform f over a number field K with integer Hecke eigenvalues generally should have an associated elliptic curve E_f over K. In our previous paper, we associated, building on works of Darmon…

Number Theory · Mathematics 2015-01-15 Xavier Guitart , Marc Masdeu , Mehmet Haluk Sengun

We show all Laurent $F$-crystals over $p$-adic fields are overconvergent.

Number Theory · Mathematics 2022-11-29 Heng Du , Tong Liu

Let X be a smooth proper curve over a finite field of characteristic p. We prove a product formula for p-adic epsilon factors of arithmetic D-modules on X. In particular we deduce the analogous formula for overconvergent F-isocrystals,…

Algebraic Geometry · Mathematics 2014-05-14 Tomoyuki Abe , Adriano Marmora

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

Suppose $G$ is a tamely ramified $p$-adic reductive group. We construct a partial local Langlands correspondence between the set of irreducible smooth representations of $G$ having depth $r$ and a certain set of $G^\vee$-conjugacy classes…

Representation Theory · Mathematics 2025-09-10 Tsao-Hsien Chen , Stephen DeBacker , Cheng-Chiang Tsai

It is conjectured by de Jong that, if $X$ is a connected smooth projective variety over an algebraically closed field $k$ of characteristic $p>0$ with trivial \'etale fundamental group, any isocrystal on on $X/W$ is trivial. We prove this…

Algebraic Geometry · Mathematics 2016-04-13 Hélène Esnault , Atsushi Shiho

Motivated by the Langlands program in representation theory, number theory and geometry, the theory of representations of a reductive $p$-adic group over a coefficient ring different from the field of complex numbers has been widely…

Representation Theory · Mathematics 2022-05-05 Marie-France Vignéras

Deligne's conjecture that $\ell$-adic sheaves on normal schemes over a finite field admit $\ell'$-companions was proved by L. Lafforgue in the case of curves and by Drinfeld in the case of smooth schemes. In this paper, we extend Drinfeld's…

Algebraic Geometry · Mathematics 2019-06-24 Weizhe Zheng