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arXiv 2006.00883math.NT
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具有复乘的椭圆曲线除域族中的纠缠

Entanglement in the family of division fields of elliptic curves with complex multiplication

Francesco Campagna, Riccardo Pengo

摘要:

对定义在含有复乘(CM)的数域$F$上的椭圆曲线$E$,证明了当$E$的$p^{\infty}$-除域族中含有$p \in \mathbb{N}$素数时,去掉一个显式有限域族后,$E$的$p^{\infty}$-除域族在$F$上线性不交.然后,我们给出了一个必要条件,这个有限的子族是纠缠在$F$,这是总是满足时,$F = K$。在这种情况下,并进一步假设椭圆曲线$E$是从$\mathbb{Q}$基变得到的,我们详细描述了$E$分裂域族中的纠缠。

英文摘要:

For every elliptic curve $E$ which has complex multiplication (CM) and is defined over a number field $F$ containing the CM field $K$, we prove that the family of $p^{\infty}$-division fields of $E$, with $p \in \mathbb{N}$ prime, becomes linearly disjoint over $F$ after removing an explicit finite subfamily of fields. We then give a necessary condition for this finite subfamily to be entangled over $F$, which is always met when $F = K$. In this case, and under the further assumption that the elliptic curve $E$ is obtained as a base-change from $\mathbb{Q}$, we describe in detail the entanglement in the family of division fields of $E$.

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