Abstract
G. Frey and M. Jarden (1974, Proc. London Math. Soc.28, 112–128) asked if every Abelian variety A defined over a number field k with dimA>0 has infinite rank over the maximal Abelian extension kab of k. We verify this for the Jacobians of cyclic covers of P1, with no hypothesis on the Weierstrass points or on the base field. We also derive an infinite rank criterion by analyzing the ramification of division points of an Abelian variety. As an application, we show that any d -dimensional Abelian variety A over k with a degree n projective embedding over k has infinite rank over the compositum of all extensions of k of degree <n(4d+2).
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