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Thetanullwerte: from periods to good equations.

Jordi Guàrdia (2007)

Publicacions Matemàtiques

We will show the utility of the classical Jacobi Thetanullwerte for the description of certain period lattices of elliptic curves, providing equations with good arithmetical properties. These equations will be the starting point for the construction of families of elliptic curves with everywhere good reduction.[Proceedings of the Primeras Jornadas de Teoría de Números (Vilanova i la Geltrú (Barcelona), 30 June - 2 July 2005)].

Torsion and Tamagawa numbers

Dino Lorenzini (2011)

Annales de l’institut Fourier

Let K be a number field, and let A / K be an abelian variety. Let c denote the product of the Tamagawa numbers of A / K , and let A ( K ) tors denote the finite torsion subgroup of A ( K ) . The quotient c / | A ( K ) tors | is a factor appearing in the leading term of the L -function of A / K in the conjecture of Birch and Swinnerton-Dyer. We investigate in this article possible cancellations in this ratio. Precise results are obtained for elliptic curves over or quadratic extensions K / , and for abelian surfaces A / . The smallest possible ratio...

Torsion des courbes elliptiques sur les corps cubiques

Pierre Parent (2000)

Annales de l'institut Fourier

On donne la liste (à un élément près) des nombres premiers qui sont l’ordre d’un point de torsion d’une courbe elliptique sur un corps de nombres de degré trois.

Twists of Hessian Elliptic Curves and Cubic Fields

Katsuya Miyake (2009)

Annales mathématiques Blaise Pascal

In this paper we investigate Hesse’s elliptic curves H μ : U 3 + V 3 + W 3 = 3 μ U V W , μ Q - { 1 } , and construct their twists, H μ , t over quadratic fields, and H ˜ ( μ , t ) , μ , t Q over the Galois closures of cubic fields. We also show that H μ is a twist of H ˜ ( μ , t ) over the related cubic field when the quadratic field is contained in the Galois closure of the cubic field. We utilize a cubic polynomial, R ( t ; X ) : = X 3 + t X + t , t Q - { 0 , - 27 / 4 } , to parametrize all of quadratic fields and cubic ones. It should be noted that H ˜ ( μ , t ) is a twist of H μ as algebraic curves because it may not always have any rational points...

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