English

Elliptic curves with complex multiplication and abelian division fields

Number Theory 2023-08-02 v1

Abstract

Let KK be an imaginary quadratic field, and let OK,f\mathcal{O}_{K,f} be an order in KK of conductor f1f\geq 1. Let EE be an elliptic curve with CM by OK,f\mathcal{O}_{K,f}, such that EE is defined by a model over Q(jK,f)\mathbb{Q}(j_{K,f}), where jK,f=j(E)j_{K,f}=j(E). In this article, we classify the values of N2N\geq 2 and the elliptic curves EE such that (i) the division field Q(jK,f,E[N])\mathbb{Q}(j_{K,f},E[N]) is an abelian extension of Q(jK,f)\mathbb{Q}(j_{K,f}), and (ii) the NN-division field coincides with the NN-th cyclotomic extension of the base field.

Keywords

Cite

@article{arxiv.2308.00668,
  title  = {Elliptic curves with complex multiplication and abelian division fields},
  author = {Asimina S. Hamakiotes and Alvaro Lozano-Robledo},
  journal= {arXiv preprint arXiv:2308.00668},
  year   = {2023}
}
R2 v1 2026-06-28T11:45:44.409Z