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REDUCTIONS OF POINTS ON ALGEBRAIC GROUPS

  • Davide Lombardo (a1) and Antonella Perucca (a2)

Abstract

Let $A$ be the product of an abelian variety and a torus defined over a number field $K$ . Fix some prime number $\ell$ . If $\unicode[STIX]{x1D6FC}\in A(K)$ is a point of infinite order, we consider the set of primes $\mathfrak{p}$ of $K$ such that the reduction $(\unicode[STIX]{x1D6FC}\hspace{0.2em}{\rm mod}\hspace{0.2em}\mathfrak{p})$ is well-defined and has order coprime to $\ell$ . This set admits a natural density. By refining the method of Jones and Rouse [Galois theory of iterated endomorphisms, Proc. Lond. Math. Soc. (3)100(3) (2010), 763–794. Appendix A by Jeffrey D. Achter], we can express the density as an $\ell$ -adic integral without requiring any assumption. We also prove that the density is always a rational number whose denominator (up to powers of $\ell$ ) is uniformly bounded in a very strong sense. For elliptic curves, we describe a strategy for computing the density which covers every possible case.

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REDUCTIONS OF POINTS ON ALGEBRAIC GROUPS

  • Davide Lombardo (a1) and Antonella Perucca (a2)

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