Elliptic curves with complex multiplication and abelian division fields
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 CM by $\mathcal{O}_{K,f}$, such that $E$ is defined by a model over $\mathbb{Q}(j_{K,f})$, where $j_{K,f}=j(E)$. In this article, we classify the values o...
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Zusammenfassung: | 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 CM by
$\mathcal{O}_{K,f}$, such that $E$ is defined by a model over
$\mathbb{Q}(j_{K,f})$, where $j_{K,f}=j(E)$. In this article, we classify the
values of $N\geq 2$ and the elliptic curves $E$ such that (i) the division
field $\mathbb{Q}(j_{K,f},E[N])$ is an abelian extension of
$\mathbb{Q}(j_{K,f})$, and (ii) the $N$-division field coincides with the
$N$-th cyclotomic extension of the base field. |
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DOI: | 10.48550/arxiv.2308.00668 |