Elliptic curves and finitely generated Galois groups
Number Theory
2025-10-02 v1
Abstract
Let be an extension of and an elliptic curve. If is finitely generated, then is of infinite rank over . In particular, this implies the case of the Junker-Koenigsmann conjecture. This "anti-Mordellic'' result follows from a new "Mordellic'' theorem, which asserts that if is finitely generated over , the points of an abelian variety over the compositum of all bounded-degree Galois extensions of form a virtually free abelian group. This, in turn, follows from a second Mordellic result, which asserts that the group of over the extension of defined by the torsion of is free modulo torsion.
Keywords
Cite
@article{arxiv.2510.00750,
title = {Elliptic curves and finitely generated Galois groups},
author = {Bo-Hae Im and Michael Larsen},
journal= {arXiv preprint arXiv:2510.00750},
year = {2025}
}
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16 pages