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Published online by Cambridge University Press: 20 November 2018
Let $V$ be a
$K3$ surface defined over a number field
$k$ . The Batyrev-Manin conjecture for
$V$ states that for every nonempty open subset
$U$ of
$V$ , there exists a finite set
${{Z}_{U}}$ of accumulating rational curves such that the density of rational points on
$U\,-\,{{Z}_{U}}$ is strictly less than the density of rational points on
${{Z}_{U}}$ . Thus, the set of rational points of
$V$ conjecturally admits a stratification corresponding to the sets
${{Z}_{U}}$ for successively smaller sets
$U$ .
In this paper, in the case that $V$ is a Kummer surface, we prove that the Batyrev-Manin conjecture for
$V$ can be reduced to the Batyrev-Manin conjecture for
$V$ modulo the endomorphisms of
$V$ induced by multiplication by
$m$ on the associated abelian surface
$A$ . As an application, we use this to show that given some restrictions on
$A$ , the set of rational points of
$V$ which lie on rational curves whose preimages have geometric genus 2 admits a stratification of Batyrev-Manin type.