On the $p$-adic closure of a subgroup of rational points on an Abelian variety

Details On the $p$-adic closure of a subgroup of rational points on an Abelian variety On the $p$-adic closure of a subgroup of rational points on an Abelian variety

2010-12-21

arxiv.org/abs/1012.4823v1

Mathematics

Number Theory

Scientific paper

In 2007, B. Poonen (unpublished) studied the $p$--adic closure of a subgroup of rational points on a commutative algebraic group. More recently, J. Bella\"iche asked the same question for the special case of Abelian varieties. These problems are $p$--adic analogues of a question raised earlier by B. Mazur on the density of rational points for the real topology. For a simple Abelian variety over the field of rational numbers, we show that the actual $p$--adic rank is at least the third of the expected value.

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