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arXiv 2103.16672math.NT
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超椭圆曲线上点生成的域

Fields generated by points on superelliptic curves

Lea Beneish, Christopher Keyes

AI总结:

本文给出了超椭圆曲线上代数点生成的域扩张数量的渐近下界,并探讨了不同次数点的丰度差异及有限性条件。

摘要:

我们给出了一个渐近下界,关于由超椭圆曲线上代数点在 $\mathbb{Q}$ 上生成的、具有固定次数 $n$ 且判别式以 $X$ 为界的域扩张数量。对于由仿射方程 $y^m = f(x)$ 给定的固定此类曲线 $C$,其中 $m \geq 2$ 且 $d= \mathrm{deg}\ f (x) \geq m$,我们发现对于所有能被 $\gcd(m, d)$ 整除且足够大的次数 $n$,此类域的数量渐近下界为 $X^{δ_n}$,其中当 $n \to \infty$ 时 $δ_n \to 1/m^2$。随后,我们给出了几何启发式建议,指出对于不被 $\gcd(m, d)$ 整除的 $n$,次数为 $n$ 的点可能少于 $n$ 被 $\gcd(m,d)$ 整除的点,并提供了一个已知曲线在某些次数下具有有限多点的条件示例。

英文摘要:

We give an asymptotic lower bound on the number of field extensions generated by algebraic points on superelliptic curves over $\mathbb{Q}$ with fixed degree $n$ and discriminant bounded by $X$. For $C$ a fixed such curve given by an affine equation $y^m = f(x)$ where $m \geq 2$ and $d= \mathrm{deg}\ f (x) \geq m$, we find that for all degrees $n$ divisible by $\gcd(m, d)$ and sufficiently large, the number of such fields is asymptotically bounded below by $X^{δ_n}$, where $δ_n \to 1/m^2$ as $n \to \infty$. We then give geometric heuristics suggesting that for n not divisible by $\gcd(m, d)$, degree $n$ points may be less abundant than those for which $n$ is divisible by $\gcd(m,d)$ and provide an example of conditions under which a curve is known to have finitely many points of certain degrees.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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