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arXiv 1201.0822math.NT
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有限域上的随机Dieudonne模、随机p-可除群和随机曲线

Random Dieudonne modules, random p-divisible groups, and random curves over finite fields

Bryden Cais, Jordan S. Ellenberg, David Zureick-Brown

摘要:

本文描述了特征为p的有限域k上的主拟极化p-可除群的同构类的概率分布,它可以合理地被认为是“均匀分布”,并计算了各种统计量(p-corank,a-数等)的分布。从这个分布中抽取的p-可除群。然后自然会问,在多大程度上p-可除群附着于随机选择的超椭圆曲线(分别为曲线,阿贝尔簇)在这个意义上是均匀分布的。例如,我们可以问F_p上的亏格g曲线的比例,其雅可比矩阵是普通的,是否接近这种启发式预测的极限。这种启发式类似于Cohen-Lenstra型的代数,对于特征不是p的域k,在这种情况下,随机p-可除群由记录Frobenius作用的随机矩阵定义。广泛的数值研究揭示了一些情况下的启发式协议和一些有趣的差异。例如,F_3上的平面曲线看起来比F_3上的超椭圆曲线更不可能是普通的。

英文摘要:

We describe a probability distribution on isomorphism classes of principally quasi-polarized p-divisible groups over a finite field k of characteristic p which can reasonably be thought of as "uniform distribution," and we compute the distribution of various statistics (p-corank, a-number, etc.) of p-divisible groups drawn from this distribution. It is then natural to ask to what extent the p-divisible groups attached to a randomly chosen hyperelliptic curve (resp. curve, resp. abelian variety) over k are uniformly distributed in this sense. For instance, one can ask whether the proportion of genus-g curves over F_p whose Jacobian is ordinary approaches the limit that such a heuristic would predict. This heuristic is analogous to conjectures of Cohen-Lenstra type for fields k of characteristic other than p, in which case the random p-divisible group is defined by a random matrix recording the action of Frobenius. Extensive numerical investigation reveals some cases of agreement with the heuristic and some interesting discrepancies. For example, plane curves over F_3 appear substantially less likely to be ordinary than hyperelliptic curves over F_3.

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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