Abelian fibrations and rational points on symmetric products

Details Abelian fibrations and rational points on symmetric products Abelian fibrations and rational points on symmetric products

1999-09-14

arxiv.org/abs/math/9909074v1

Mathematics

Algebraic Geometry

17 pages, LaTeX

Scientific paper

Given a variety over a number field, are its rational points potentially dense, i.e., does there exist a finite extension over which rational points are Zariski dense? We study the question of potential density for symmetric products of surfaces. Contrary to the situation for curves, rational points are not necessarily potentially dense on a sufficiently high symmetric product. Our main result is that rational points are potentially dense for the Nth symmetric product of a K3 surface, where N is explicitly determined by the geometry of the surface. The basic construction is that for some N, the Nth symmetric power of a K3 surface is birational to an abelian fibration over P^N. It is an interesting geometric problem to find the smallest N with this property.

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