Hopf-Galois Structures on Extensions Arising from Division Points on Elliptic Curves

Abstract

We provide a general construction of infinite Hopf-Galois extensions from a direct system of finite Hopf-Galois extensions. We then apply this framework to extensions generated by division points on elliptic curves. Specifically, for a number field $K$ and an elliptic curve $E/K$ of rank at least $1$ with $P\in E(K)$ of infinite order, we consider for each integer $n\ge 2$ the extension $L_n=K(Q_n)$, where $Q_n\in E(\overline{K})$ is such that $n{Q}_n=P$. We show that the finite-level extensions $L_n/K$ need not be Hopf-Galois, and we give sufficient conditions for them to be so. We then prove that the infinite extension $L_{\infty }={\bigcup }_{n\ge 2}{L}_n$ of $K$ is potentially Hopf-Galois, meaning it becomes Hopf-Galois after a finite extension of the base field.

arXiv comment17 pages, Comments are welcome