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Elliptic curves with complex multiplication and abelian division fields

Asimina Hamakiotes, University of Connecticut
Tuesday, January 23, 2024 - 11:00am to 11:50am

Let $K$ be an imaginary quadratic field, and let $\mathcal{O}_{K,f}$ be an order in $K$ of conductor $f \geq 1$. Let $E$ be an elliptic curve with complex multiplication by $\mathcal{O}_{K,f}$, such that $E$ is defined by a model over $\mathbb{Q}(j_{K,f})$, where $j_{K,f} = j(E)$. Let $N \geq 2$ be an integer. In this talk, we will see when $\mathbb{Q}(j_{K,f},E[N])$ is an abelian extension of $\mathbb{Q}(j_{K,f})$. Further, when the extension $\mathbb{Q}(j_{K,f},E[N])/\mathbb{Q}(j_{K,f})$ is not abelian, we will discuss what the possible maximal abelian subextensions are.

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