Indecomposable translates and degree-$d$ points

Abstract

A curve over a number field has infinitely many degree-$d$ points if and only if there exists a degree-$d$ ${\mathbb{P}}^1$- or $AV$-parametrized point. We show that a ${\mathbb{P}}^1$-isolated $AV$-parametrized point arises only from an abelian translate satisfying a certain property, which we term ``indecomposable". We apply our results to a family of genus-7 curves for which we can show that every effective abelian translate in degree 5 is decomposable over the algebraic closure, giving a negative answer to a question of Viray and Vogt.

14 pages, comments welcome