Bogomolov property for Galois representations with big local image
Abstract
An algebraic extension of the rational numbers is said to have the (B) if the absolute logarithmic Weil height of its non-torsion elements is uniformly bounded from below. Given a continuous representation of the absolute Galois group of a number field , one says that has (B) if the subfield of fixed by has (B). We prove that, if maps an inertia subgroup at a prime above surjectively onto an open subgroup of , then has (B). More generally, we show that if the image of inertia is open in the image of the decomposition group, the normal closure of the local image is sufficiently large in the global one, and a certain condition on the center of satisfied, then has (B). In particular, no assumption on the modularity of is needed, contrary to previous work of Habegger and Amoroso--Terracini. We provide several examples both in modular and non-modular cases. Our methods rely on a result of Sen comparing the ramification and Lie filtrations on the -adic Lie group .
Cite
@article{arxiv.2503.14052,
title = {Bogomolov property for Galois representations with big local image},
author = {Andrea Conti and Lea Terracini},
journal= {arXiv preprint arXiv:2503.14052},
year = {2025}
}
Comments
38 pages. Weakened the hypothesis of potential total ramifiedness to local potential total ramifiedness together with a normal closure assumption. Included some applications to elliptic curves over number fields and abelian varieties