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Formes compagnons et complexe BGG dual pour G S p 4

J. Tilouine (2012)

Annales de l’institut Fourier

On montre, sous certaines hypothèses un résultat en direction de la conjecture de Serre pour G S p 4 formulée dans un autre article avec F. Herzig : si la représentation résiduelle associée à une forme de Siegel de genre 2 , de niveau premier à p , p -ordinaire de poids p -petit, laisse stables deux droites (au lieu d’une) dans un plan lagrangien, alors cette forme possède une forme compagnon de poids prescrit. Notre méthode consiste à traduire, grâce au théorème de comparaison mod. p de Faltings, l’existence...

Formes de jacobi et formule de Weber p -adique

Abdelmejid Bayad (1999)

Journal de théorie des nombres de Bordeaux

Dans ce texte, on construit sur un corps local de caractéristique strictement positive, un analogue p -adique aux formes de Jacobi méromorphes complexes D L ( z ; ϕ ) , étudiées dans [3] et [4]. Le théorème principal établit que les formes de Jacobi p -adiques obtenues satisfont deux relations de distribution et d’inversion additives. L’analogue p -adique à une formule de Weber généralisée est prouvé comme corollaire du théorème principal.

Frobenius nonclassicality with respect to linear systems of curves of arbitrary degree

Nazar Arakelian, Herivelto Borges (2015)

Acta Arithmetica

For each integer s ≥ 1, we present a family of curves that are q -Frobenius nonclassical with respect to the linear system of plane curves of degree s. In the case s=2, we give necessary and sufficient conditions for such curves to be q -Frobenius nonclassical with respect to the linear system of conics. In the q -Frobenius nonclassical cases, we determine the exact number of q -rational points. In the remaining cases, an upper bound for the number of q -rational points will follow from Stöhr-Voloch...

Fundamental domains for Shimura curves

David R. Kohel, Helena A. Verrill (2003)

Journal de théorie des nombres de Bordeaux

We describe a process for defining and computing a fundamental domain in the upper half plane of a Shimura curve X 0 D ( N ) associated with an order in a quaternion algebra A / 𝐐 . A fundamental domain for X 0 D ( N ) realizes a finite presentation of the quaternion unit group, modulo units of its center. We give explicit examples of domains for the curves X 0 6 ( 1 ) , X 0 15 ( 1 ) , and X 0 35 ( 1 ) . The first example is a classical example of a triangle group and the second is a corrected version of that appearing in the book of Vignéras [13], due to Michon....

Galois actions on Néron models of Jacobians

Lars H. Halle (2010)

Annales de l’institut Fourier

Let X be a smooth curve defined over the fraction field K of a complete discrete valuation ring R . We study a natural filtration of the special fiber of the Néron model of the Jacobian of X by closed, unipotent subgroup schemes. We show that the jumps in this filtration only depend on the fiber type of the special fiber of the minimal regular model with strict normal crossings for X over R , and in particular are independent of the residue characteristic. Furthermore, we obtain information about...

Galois covers between K 3 surfaces

Gang Xiao (1996)

Annales de l'institut Fourier

We give a classification of finite group actions on a K 3 surface giving rise to K 3 quotients, from the point of view of their fixed points. It is shown that except two cases, each such group gives rise to a unique type of fixed point set.

Galois orbits and equidistribution: Manin-Mumford and André-Oort.

Andrei Yafaev (2009)

Journal de Théorie des Nombres de Bordeaux

We overview a unified approach to the André-Oort and Manin-Mumford conjectures based on a combination of Galois-theoretic and ergodic techniques. This paper is based on recent work of Klingler, Ullmo and Yafaev on the André-Oort conjecture, and of Ratazzi and Ullmo on the Manin-Mumford conjecture.

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