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We provide a geometric Hodge-Tate map giving generic description of the overconvergent modular symbols of some p-adic (accessible) weight k, base-changed to C_p, in terms of overconvergent modular forms of weight k+2.

Number Theory · Mathematics 2014-01-14 Fabrizio Andreatta , Adrian Iovita , Glenn Stevens

We introduce the notion of H-equivariant Morita-Takeuchi theory for coalgebras with symmetries given by a Hopf algebra H. A cohomology theory is introduced which classifies the possible lifts of coactions on coalgebras to corresponding…

Representation Theory · Mathematics 2018-06-22 Bastian Seifert

The Hodge-Tate spectral sequence for a proper smooth variety over a p-adic field provides a framework for us to revisit Faltings' approach to p-adic Hodge theory and to fill in many details. The spectral sequence is obtained from the…

Algebraic Geometry · Mathematics 2015-09-14 Ahmed Abbes , Michel Gros

Lazard showed in his seminal work "Groupes analytiques $p$-adiques" that for rational coefficients continuous group cohomology of $p$-adic Lie-groups is isomorphic to Lie-algebra cohomology. We refine this result in two directions: firstly…

Number Theory · Mathematics 2019-02-20 Annette Huber , Guido Kings , Niko Naumann

Hodge Theory of $p$-adic analytic varieties was initiated by Tate in his 1967 paper on $p$-divisible groups, where he conjectured the existence of a Hodge-like decomposition for the $p$-adic \'etale cohomology of proper analytic varieties.…

Algebraic Geometry · Mathematics 2026-01-26 Pierre Colmez , Wiesława Nizioł

We compute the integral $p$-adic \'etale cohomology of Drinfeld symmetric spaces of any dimension. This refines the computation of the rational $p$-adic \'etale cohomology from Colmez-Dospinescu-Nizio{\l}. The main tools are: the…

Algebraic Geometry · Mathematics 2023-02-22 Pierre Colmez , Gabriel Dospinescu , Wiesława Nizioł

We show that for a noetherian algebra $A$ whose bounded dg derived category is smooth, the singular Hochschild cohomology (=Tate--Hochschild cohomology) is isomorphic, as a graded algebra, to the Hochschild cohomology of the dg singularity…

Representation Theory · Mathematics 2020-09-10 Bernhard Keller

We study the log version of the prismatic Dieudonn\'{e} theory established by Ansch\"{u}tz-Le Bras. By applying this result to the integral toroidal compactification of a Shimura variety of Hodge type, we extend the prismatic realization,…

Algebraic Geometry · Mathematics 2025-05-06 Kentaro Inoue

We construct the crystalline comparison isomorphisms for proper smooth formal schemes over an absolutely unramified base. Such isomorphisms hold for \'etale cohomology with nontrivial coefficients, as well as in the relative setting, i.e.…

Algebraic Geometry · Mathematics 2019-06-11 Fucheng Tan , Jilong Tong

We derive a relative version of the local monodromy theorem for ordinary differential equations on an annulus over a mixed-characteristic nonarchimedean field, and give several applications in $p$-adic cohomology and $p$-adic Hodge theory.…

Number Theory · Mathematics 2025-05-28 Kiran S. Kedlaya

We establish duality results for the cohomology of the Weil group of a $p$-adic field, analogous to, but more general than, results from Galois cohomology. We prove a duality theorem for discrete Weil modules, which implies Tate-Nakayama…

Number Theory · Mathematics 2012-05-30 David A. Karpuk

We prove the ordinary Hecke orbit conjecture for Shimura varieties of Hodge type at primes of good reduction. We make use of the global Serre-Tate coordinates of Chai as well as recent results of D'Addezio about the $p$-adic monodromy of…

Number Theory · Mathematics 2024-04-17 Pol van Hoften

In this paper we prove that the cohomology of smooth projective tropical varieties verify the tropical analogs of three fundamental theorems which govern the cohomology of complex projective varieties: Hard Lefschetz theorem, Hodge-Riemann…

Algebraic Geometry · Mathematics 2020-07-16 Omid Amini , Matthieu Piquerez

In this paper, we study the $p$-adic and $\ell$-adic monodromy operators associated with hyper-K\"ahler varieties over $p$-adic fields, in connection with Looijenga-Lunts-Verbitsky Lie algebras. We investigate a conjectural relation between…

Algebraic Geometry · Mathematics 2025-07-21 Kazuhiro Ito , Tetsushi Ito , Teruhisa Koshikawa , Teppei Takamatsu , Haitao Zou

We formulate characteristic $p$ analogues of the Mumford--Tate and the Andr\'e--Oort conjectures for ordinary mod $p$ Shimura varieties of Hodge type, and set up general frameworks for studying them. We prove the two conjectures for…

Number Theory · Mathematics 2025-12-02 Ruofan Jiang

In this paper, we are going to establish a simultaneous generalization of the relative Iwasawa theory proposed by Kedlaya-Pottharst and the relative $p$-adic Hodge theory after Kedlaya-Liu. We call this Hodge-Iwasawa theory in the sense…

Number Theory · Mathematics 2020-06-09 Xin Tong

In this paper, we show that the infinitesimal Torelli theorem implies the existence of deformations of automorphisms. In the first part, we use Hodge theory and deformation theory to study the deformations of automorphisms of complex…

Algebraic Geometry · Mathematics 2017-03-24 Xuanyu Pan

We extend the construction of A$_{\rm inf}$-cohomology by Bhatt-Morrow-Scholze to the context of log $p$-adic formal schemes over a log perfectoid base. In particular, using coordinates, we prove comparison theorems between log A$_{\rm…

Number Theory · Mathematics 2024-02-26 Hansheng Diao , Zijian Yao

The aim of this article is to investigate the cohomology (l-adic as well as Betti) of schemes, and more generally of certain algebraic stacks, that are proper and smooth over the integers and have the property that there exists a polynomial…

Algebraic Geometry · Mathematics 2008-11-03 Theo van den Bogaart , Bas Edixhoven

We construct functorial Igusa stacks for all Hodge-type Shimura varieties, proving a conjecture of Scholze and extending earlier results of the fourth-named author for PEL-type Shimura varieties. Using the Igusa stack, we construct a sheaf…

Number Theory · Mathematics 2026-05-01 Patrick Daniels , Pol van Hoften , Dongryul Kim , Mingjia Zhang