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arXiv 1003.3000math.NTmath.AG
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固定有限域上椭圆曲线实现的群结构

On group structures realized by elliptic curves over a fixed finite field

Reza Rezaeian Farashahi, Igor E. Shparlinski

摘要:

我们得到了具有给定群结构(视为抽象阿贝尔群)的非同构椭圆曲线个数的显式公式。此外,我们给出了有限域上所有椭圆曲线的不同群结构个数的显式公式。我们使用这些公式得到了一些渐近估计和紧的上界和下界的各种计数函数有关的分类椭圆曲线根据其组结构。最后,我们提出了一些数值试验的结果,表现出几个有趣的现象,在群结构的分布。我们提出得到一个解释,这些作为一个开放的问题。

英文摘要:

We obtain explicit formulas for the number of non-isomorphic elliptic curves with a given group structure (considered as an abstract abelian group). Moreover, we give explicit formulas for the number of distinct group structures of all elliptic curves over a finite field. We use these formulas to derive some asymptotic estimates and tight upper and lower bounds for various counting functions related to classification of elliptic curves accordingly to their group structure. Finally, we present results of some numerical tests which exhibit several interesting phenomena in the distribution of group structures. We pose getting an explanation to these as an open problem.

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