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arXiv 2007.12533math.NT
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单位根存在时的Cohen-Lenstra算法和双线性对

Cohen-Lenstra heuristics and bilinear pairings in the presence of roots of unity

Michael Lipnowski, Will Sawin, Jacob Tsimerman

摘要:

设$L/K$是整体域的二次扩张.研究了当$K$包含$\ell^n$次单位根时,相对类群$G_{L/K} := \textrm{Cl}(L/K)$的$\ell$ -部分的Cohen-Lenstra算法.虽然先前已经描述了这种情况下的几何分布的矩,但是没有已知的方法来计算给定矩的分布。我们解决这个问题,通过引入新的不变量相关联的类组,$ψ_{L/K}$和$ω_{L/K},$和研究的分布$(G_{L/K}, ψ_{L/K}, ω_{L/K})$使用线性随机矩阵模型。利用这个线性模型,我们计算了函数域情形下的分布(包括我们新的不变量),然后对分布在$\ell$和$\infty$上的素数进行局部调整,从而在数域情形下提出了一个猜想,这与一些数值实验相一致.

英文摘要:

Let $L/K$ be a quadratic extension of global fields. We study Cohen-Lenstra heuristics for the $\ell$-part of the relative class group $G_{L/K} := \textrm{Cl}(L/K)$ when $K$ contains $\ell^n$th roots of unity. While the moments of a conjectural distribution in this case had previously been described, no method to calculate the distribution given the moments was known. We resolve this issue by introducing new invariants associated to the class group, $ψ_{L/K}$ and $ω_{L/K},$ and study the distribution of $(G_{L/K}, ψ_{L/K}, ω_{L/K})$ using a linear random matrix model. Using this linear model, we calculate the distribution (including our new invariants) in the function field case, and then make local adjustments at the primes lying over $\ell$ and $\infty$ to make a conjecture in the number field case, which agrees with some numerical experiments.

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