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Comparaison entre cohomologie cristalline et cohomologie étale p -adique sur certaines variétés de Shimura

Sandra Rozensztajn (2009)

Bulletin de la Société Mathématique de France

Soit X un modèle entier en un premier p d’une variété de Shimura de type PEL, ayant bonne réduction associée à un groupe réductif G . On peut associer aux p -représentations du groupe G deux types de faisceaux : des cristaux sur la fibre spéciale de X , et des systèmes locaux pour la topologie étale sur la fibre générique. Nous établissons un théorème de comparaison entre la cohomologie de ces deux types de faisceaux.

Comparison between the fundamental group scheme of a relative scheme and that of its generic fiber

Marco Antei (2010)

Journal de Théorie des Nombres de Bordeaux

We show that the natural morphism ϕ : π 1 ( X η , x η ) π 1 ( X , x ) η between the fundamental group scheme of the generic fiber X η of a scheme X over a connected Dedekind scheme and the generic fiber of the fundamental group scheme of X is always faithfully flat. As an application we give a necessary and sufficient condition for a finite, dominated pointed G -torsor over X η to be extended over X . We finally provide examples where ϕ : π 1 ( X η , x η ) π 1 ( X , x ) η is an isomorphism.

Comparison theorems between algebraic and analytic De Rham cohomology (with emphasis on the p -adic case)

Yves André (2004)

Journal de Théorie des Nombres de Bordeaux

We present a panorama of comparison theorems between algebraic and analytic De Rham cohomology with algebraic connections as coefficients. These theorems have played an important role in the development of 𝒟 -module theory, in particular in the study of their ramification properties (irregularity...). In part I, we concentrate on the case of regular coefficients and sketch the new proof of these theorems given by F. Baldassarri and the author, which is of elementary nature and unifies the complex...

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