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The class group of a one-dimensional affinoid space

Marius Van Der Put (1980)

Annales de l'institut Fourier

A curve X over a non-archimedean valued field is with respect to its analytic structure a finite union of affinoid spaces. The main result states that the class group of a one dimensional, connected, regular affinoid space Y is trivial if and only if Y is a subspace of P 1 . As a consequence, X has locally a trivial class group if and only if the stable reduction of X has only rational components.

The Schottky-Jung theorem for Mumford curves

Guido Van Steen (1989)

Annales de l'institut Fourier

The Schottky-Jung proportionality theorem, from which the Schottky relation for theta functions follows, is proved for Mumford curves, i.e. curves defined over a non-archimedean valued field which are parameterized by a Schottky group.

Théorie de Fontaine en égales caractéristiques

Alain Genestier, Vincent Lafforgue (2011)

Annales scientifiques de l'École Normale Supérieure

Les chtoucas locaux sont des analogues en égales caractéristiques des groupes p -divisibles — par exemple on leur associe un module de Tate, qui est un module libre sur l’anneau d’entiers d’un corps local K de caractéristique positive. Nous associons à un chtouca local une structure de Hodge (ou, plus précisément, une structure de Hodge-Pink), ce qui induit un morphisme de périodes analogue à celui construit par Rapoport et Zink. Pour les structures de Hodge-Pink définies sur une extension finie...

Torsors under tori and Néron models

Martin Bright (2011)

Journal de Théorie des Nombres de Bordeaux

Let R be a Henselian discrete valuation ring with field of fractions K . If X is a smooth variety over K and G a torus over K , then we consider X -torsors under G . If 𝒳 / R is a model of X then, using a result of Brahm, we show that X -torsors under G extend to 𝒳 -torsors under a Néron model of G if G is split by a tamely ramified extension of K . It follows that the evaluation map associated to such a torsor factors through reduction to the special fibre. In this way we can use the geometry of the special...

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