An arithmetic theory of Jacobi forms in higher dimensions.
Let G be a commutative algebraic group defined over a number field K that is disjoint over K from and satisfies the condition of semistability. Consider a linear form l on the Lie algebra of G with algebraic coefficients and an algebraic point u in a p-adic neighbourhood of the origin with the condition that l does not vanish at u. We give a lower bound for the p-adic absolute value of l(u) which depends up to an effectively computable constant only on the height of the linear form, the height...
Soit un revêtement ramifié de défini sur . Lorsqu’on s’intéresse aux propriétés de rationalité de sur les les corps de nombres, on peut soit exiger que la base soit , soit l’autoriser à être une courbe de genre . Nous comparons ces deux points de vue pour les revêtements non ramifiés en dehors de
We study the distribution of rational points on a certain exponential-algebraic surface and we prove, for this surface, a conjecture of A. J. Wilkie.
Let f ∈ ℚ [X] and deg f ≤ 3. We prove that if deg f = 2, then the diophantine equation f(x)f(y) = f(z)² has infinitely many nontrivial solutions in ℚ (t). In the case when deg f = 3 and f(X) = X(X²+aX+b) we show that for all but finitely many a,b ∈ ℤ satisfying ab ≠ 0 and additionally, if p|a, then p²∤b, the equation f(x)f(y) = f(z)² has infinitely many nontrivial solutions in rationals.
Let be a number field. Let be a finite set of places of containing all the archimedean ones. Let be the ring of -integers of . In the present paper we consider endomorphisms of of degree , defined over , with good reduction outside . We prove that there exist only finitely many such endomorphisms, up to conjugation by , admitting a periodic point in of order . Also, all but finitely many classes with a periodic point in of order are parametrized by an irreducible curve.
Nous donnons une démonstration du fait que le groupe des classes d’un schéma irréductible de type fini sur est de type fini. Cette preuve ne repose pas sur le théorème de Mordell-Weil-Néron, mais plutôt sur le théorème de Mordell-Weil classique, le théorème de Néron-Severi et les théorèmes de Hironaka et de Jong sur la résolution des singularités. Nous en déduisons quelques corollaires, parmi lesquels le théorème de Mordell-Weil-Néron lui-même.
In this paper we study the structure and the degeneracies of the Mumford-Tate group of a 1-motive defined over . This group is an algebraic - group acting on the Hodge realization of and endowed with an increasing filtration . We prove that the unipotent radical of , which is , injects into a “generalized” Heisenberg group. We then explain how to reduce to the study of the Mumford-Tate group of a direct sum of 1-motives whose torus’character group and whose lattice are both of rank 1....
On donne une nouvelle démonstration directe du théorème de Hilbert-Samuel arithmétique et on déduit un critère numérique pour l’existence de sections d’un fibré en droite sur une variété arithmétique de norme sup inférieure à un.