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On the zeta functions of prehomogeneous vector spaces for a pair of simple algebras

Takashi Taniguchi (2007)

Annales de l’institut Fourier

In this paper we consider the prehomogeneous vector space for a pair of simple algebras which are inner forms of the D 4 type and the E 6 type. We mainly study the non-split cases. The main purpose of this paper is to determine the principal parts of the global zeta functions associated with these spaces when the simple algebras are non-split. We also give a description of the sets of rational orbits of these spaces, which clarifies the expected density theorems arising from the properties of these...

Optimisation du théorème d’Ax-Sen-Tate et application à un calcul de cohomologie galoisienne p -adique

Jérémy Le Borgne (2010)

Annales de l’institut Fourier

Soit K un corps p -adique, G son groupe de Galois absolu et v la valuation sur C p . Dans sa démonstration du théorème d’Ax-Sen-Tate, Ax montre que si pour un A R , x C p vérifie v ( σ x - x ) A pour tout σ G , alors il existe y K tel que v ( x - y ) A - c , avec c = p / ( p - 1 ) 2 . Ax se pose la question de l’optimalité de la constante c , que nous étudions ici. En utilisant l’extension de K engendrée par les racines p m -es d’une uniformisante fixée de K , nous déterminons la constante optimale, ainsi que des informations supplémentaires sur les x C p tels que v ( σ x - x ) A pour...

Overconvergent modular symbols and p -adic L -functions

Robert Pollack, Glenn Stevens (2011)

Annales scientifiques de l'École Normale Supérieure

This paper is a constructive investigation of the relationship between classical modular symbols and overconvergent p -adic modular symbols. Specifically, we give a constructive proof of acontrol theorem (Theorem 1.1) due to the second author [19] proving existence and uniqueness of overconvergent eigenliftings of classical modular eigensymbols of non-critical slope. As an application we describe a polynomial-time algorithm for explicit computation of associated p -adic L -functions in this case. In...

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