arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1606.06103math.NT
收藏

数域类群中的$\ell$ -扭

On $\ell$-torsion in class groups of number fields

Jordan Ellenberg, Lillian B. Pierce, Melanie Matchett Wood

摘要:

对于每一个整数$\ell \geq 1$,我们证明了一个无条件的上界的大小的$\ell$ -扭转子群的类组,它适用于所有,但一个零密度集的域扩张的$\mathbb{Q}$的程度$d$,任何固定的$d \in \{2,3,4,5\}$(与额外的限制,在这种情况下$d=4$,该领域是非$D_4$)。对于足够大的$\ell$(明确指定),这些结果是作为一个先前已知的约束条件GRH一样强。作为我们的论点的一部分,我们开发了一个概率“切比雪夫筛”,并给出了统一的,节能的误差项的渐近四次(非$D_4$)和五次字段选择分裂类型在一个有限的素数。

英文摘要:

For each integer $\ell \geq 1$, we prove an unconditional upper bound on the size of the $\ell$-torsion subgroup of the class group, which holds for all but a zero-density set of field extensions of $\mathbb{Q}$ of degree $d$, for any fixed $d \in \{2,3,4,5\}$ (with the additional restriction in the case $d=4$ that the field be non-$D_4$). For sufficiently large $\ell$ (specified explicitly), these results are as strong as a previously known bound that is conditional on GRH. As part of our argument, we develop a probabilistic "Chebyshev sieve," and give uniform, power-saving error terms for the asymptotics of quartic (non-$D_4$) and quintic fields with chosen splitting types at a finite set of primes.

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。

↑