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Conjectures for distributions of class groups of extensions of number fields containing roots of unity

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arxiv 2301.00791 v2 pith:OQZTLPHQ submitted 2023-01-02 math.NT

classification math.NT
keywords conjecturesclassnumberdistributionextensionsfieldgroupsroots
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abstract

Cohen, Lenstra, and Martinet have given conjectures for the distribution of class groups of extensions of number fields, but Achter and Malle have given theoretical and numerical evidence that these conjectures are wrong regarding the Sylow $p$-subgroups of the class group when the base number field contains $p$th roots of unity. We give complete conjectures of the distribution of Sylow $p$-subgroups of class groups of extensions of a number field when $p$ does not divide the degree of the Galois closure of the extension. These conjectures are based on $q\rightarrow\infty$ theorems on these distributions in the function field analog and use recent work of the authors on explicitly giving a distribution of modules from its moments. Our conjecture matches many, but not all, of the previous conjectures that were made in special cases taking into account roots of unity.

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  1. The second moment of the size of the $2$-class group of monogenized cubic fields

    math.NT 2025-06 conditional novelty 7.0 of 10

    The second moment of the size of the 2-class group of monogenized cubic fields is at most 3 for totally real fields and at most 6 for complex fields, with matching lower bounds conditional on a tail estimate.

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