On Larsen's conjecture on the ranks of Elliptic Curves

Abstract

Let $E$ be an elliptic curve over $\mathbb{Q}$ and $G=\langle\sigma_1, \dots, \sigma_n\rangle$ be a finitely generated subgroup of $\operatorname{Gal}(\overline{\mathbb{Q}}/ \mathbb{Q})$. Larsen's conjecture claims that the rank of the Mordell-Weil group $E(\overline{\mathbb{Q}}^G)$ is infinite where ${\overline{\mathbb Q}}^G$ is the $G$-fixed sub-field of $\overline{\mathbb Q}$. In this paper we prove the conjecture for the case in which $\sigma_i$ for each $i=1, \dots, n$ is an element of some infinite families of elements of $\operatorname{Gal}(\overline{\mathbb{Q}}/ \mathbb{Q})$.