Rank growth of abelian varieties over certain finite Galois extensions

Abstract

We prove that if $f:X \rightarrow A$ is a morphism from a smooth projective variety $X$ to an abelian variety $A$ over a number field $K$, and $G$ is a subgroup of automorphisms of $X$ satisfying certain properties, and if a prime $p$ divides the order of $G$, then the rank of $A$ increases by at least $p$ over infinitely many linearly disjoint $G$-extensions $L_i/K$. We also explore the conditions on such varieties $X$ and groups $G$, with applications to Jacobian varieties, and provide two infinite families of elliptic curves with rank growth of $2$ and $3$, respectively.