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arXiv 2008.09087math.NT
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非阿贝尔纠缠的椭圆曲线

Elliptic curves with non-abelian entanglements

Nathan Jones, Ken McMurdy

摘要:

我们考虑四元组$(K,E,m_1,m_2)$的分类问题,其中$K$是数域,$E$是定义在$K$上的椭圆曲线,$(m_1,m_2)$是一对互质正整数,其交集$K(E[m_1]) \cap K(E[m_2])$是$K$的非阿贝尔扩张.有一个无限的模曲线集合$\mathcal{S}$,它的$K$ -有理点捕获了$K$上的所有椭圆曲线,而不需要复乘。我们的主要定理明确地描述了由亏格为零的模曲线组成的$\mathcal{S}$的(有限)子集。在$K = \mathbb{Q}$的情况下,这有应用程序的问题,确定何时伽罗瓦表示的扭转$E$是尽可能大的模规定的障碍,我们说明了这个应用程序的一个具体的例子。

英文摘要:

We consider the problem of classifying quadruples $(K,E,m_1,m_2)$ where $K$ is a number field, $E$ is an elliptic curve defined over $K$ and $(m_1,m_2)$ is a pair of relatively prime positive integers for which the intersection $K(E[m_1]) \cap K(E[m_2])$ is a non-abelian extension of $K$. There is an infinite set $\mathcal{S}$ of modular curves whose $K$-rational points capture all elliptic curves over $K$ without complex multiplication that have this property. Our main theorem explicitly describes the (finite) subset of $\mathcal{S}$ consisting of those modular curves having genus zero. In the case $K = \mathbb{Q}$, this has applications to the problem of determining when the Galois representation on the torsion of $E$ is as large as possible modulo a prescribed obstruction; we illustrate this application with a specific example.

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