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

Publication ,  Journal Article
Pierce, LB; Turnage-Butterbaugh, CL; Wood, MM
Published in: Mathematical Research Letters
2021

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."

Duke Scholars

Published In

Mathematical Research Letters

ISSN

1073-2780

Publication Date

2021

Volume

28

Issue

2

Start / End Page

575 / 621

Publisher

International Press

Related Subject Headings

  • General Mathematics
  • 4904 Pure mathematics
  • 0101 Pure Mathematics
 

Citation

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MLA
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Pierce, L. B., Turnage-Butterbaugh, C. L., & Wood, M. M. (2021). On a conjecture for $\ell$-torsion in class groups of number fields: from the perspective of moments. Mathematical Research Letters, 28(2), 575–621.
Pierce, Lillian B., Caroline L. Turnage-Butterbaugh, and Melanie Matchett Wood. “On a conjecture for $\ell$-torsion in class groups of number fields: from the perspective of moments.” Mathematical Research Letters 28, no. 2 (2021): 575–621.
Pierce LB, Turnage-Butterbaugh CL, Wood MM. On a conjecture for $\ell$-torsion in class groups of number fields: from the perspective of moments. Mathematical Research Letters. 2021;28(2):575–621.
Pierce, Lillian B., et al. “On a conjecture for $\ell$-torsion in class groups of number fields: from the perspective of moments.” Mathematical Research Letters, vol. 28, no. 2, International Press, 2021, pp. 575–621.
Pierce LB, Turnage-Butterbaugh CL, Wood MM. On a conjecture for $\ell$-torsion in class groups of number fields: from the perspective of moments. Mathematical Research Letters. International Press; 2021;28(2):575–621.

Published In

Mathematical Research Letters

ISSN

1073-2780

Publication Date

2021

Volume

28

Issue

2

Start / End Page

575 / 621

Publisher

International Press

Related Subject Headings

  • General Mathematics
  • 4904 Pure mathematics
  • 0101 Pure Mathematics