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arXiv 1902.02008math.NT
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数域类群中$\ell$ -挠的一个猜想:矩的观点

On a conjecture for $\ell$-torsion in class groups of number fields: from the perspective of moments

Lillian B. Pierce, Caroline L. Turnage-Butterbaugh, Melanie Matchett Wood

摘要:

证明了在任意数域的类群中,对每个整数$\ell \geq 1$,其$\ell$ -挠子群是非常小的(在适当的意义上,相对于数域的判别式).在几乎所有的情况下,这一猜想的全部力量仍然是开放的,甚至部分进展是有限的。最近,$\ell$ -torsion猜想的平均版本取得了重大进展,主要依赖于数域的计数,这引起了人们对这两种问题如何关联的兴趣。本文给出了$\ell$ -挠猜想与Cohen-Lenstra挠猜想、固定判别数域的计数、有界判别数域(或相关不变量)的计数以及导体固定的椭圆曲线的计数之间的定量关系.所有这些考虑都加强了我们期望$\ell$ -挠猜想是正确的,尽管进展有限。我们的观点集中在逐点界,平均值和高阶矩之间的关系,并证明了“矩量法”的广泛实用性。"

英文摘要:

It is conjectured that within the class group of any number field, for every integer $\ell \geq 1$, the $\ell$-torsion subgroup is very small (in an appropriate sense, relative to the discriminant of the field). In nearly all settings, the full strength of this conjecture remains open, and even partial progress is limited. Significant recent progress toward average versions of the $\ell$-torsion conjecture has crucially relied on counts for number fields, raising interest in how these two types of question relate. In this paper we make explicit the quantitative relationships between the $\ell$-torsion conjecture and other well-known conjectures: the Cohen-Lenstra heuristics, counts for number fields of fixed discriminant, counts for number fields of bounded discriminant (or related invariants), and counts for elliptic curves with fixed conductor. All of these considerations reinforce that we expect the $\ell$-torsion conjecture is true, despite limited progress toward it. Our perspective focuses on the relation between pointwise bounds, averages, and higher moments, and demonstrates the broad utility of the "method of moments."

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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