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arXiv 1503.03276math.NT
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有限域上射影线的双二次覆盖的统计性质

Statistics for biquadratic covers of the projective line over finite fields

Elisa Lorenzo, Giulio Meleleo, Piermarco Milione, Alina Bucur

摘要:

研究了当曲线在模空间的不可约分支中变化时,作为$\mathbb{P}^{1}_{\mathbb{F}_{q}}$的四次非循环覆盖的亏格$g$曲线的Frobenius自同态的迹的分布.证明了当$q$固定时,Frobenius迹的极限分布等于$q + 1$独立随机离散变量之和.我们还表明,当这两个$g$和$q$去无穷大,规范化的轨迹有一个标准的复高斯分布。最后,我们将这些计算推广到一般情况下的任意覆盖的$\mathbb{P}^{1}_{\mathbb{F}_{q}}$与伽罗瓦群同构的$r$副本的$\mathbb{Z}/2\mathbb{Z}$。对于$r = 1$,我们恢复了已知的超椭圆情况。我们还包括一个附录,由Alina Bucur给出这些分布的启发式。

英文摘要:

We study the distribution of the traces of the Frobenius endomorphism of genus $g$ curves which are quartic non-cyclic covers of $\mathbb{P}^{1}_{\mathbb{F}_{q}}$, as the curve varies in an irreducible component of the moduli space. We show that for $q$ fixed, the limiting distribution of the trace of Frobenius equals the sum of $q + 1$ independent random discrete variables. We also show that when both $g$ and $q$ go to infinity, the normalized trace has a standard complex Gaussian distribution. Finally, we extend these computations to the general case of arbitrary covers of $\mathbb{P}^{1}_{\mathbb{F}_{q}}$ with Galois group isomorphic to $r$ copies of $\mathbb{Z}/2\mathbb{Z}$. For $r = 1$, we recover the already known hyperelliptic case. We also include an appendix by Alina Bucur giving the heuristic of these distributions.

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