Nonabelian Cohen–Lenstra distribution conjecture for pro-prime-to-roots-of-unity class groups
Nonabelian Cohen–Lenstra distribution conjecture for pro-prime-to-roots-of-unity class groups
Let or , and let be the group of roots of unity contained in . Let be the finite group and the cyclic subgroup governing the extensions under consideration. As varies over -extensions of , consider the pro-prime-to- completion of . For an admissible -group with and , let its -moment be the expected number of -equivariant surjections onto . Nonabelian Cohen–Lenstra conjecture. The distribution of the pro-prime-to- completion of is predicted by the probability measure defined by the random group model. Moreover, the -moment of the distribution of is
This is the main conjectural extension of the Cohen–Lenstra heuristics to nonabelian admissible -groups. The source gives no evidence that the distribution statement or the stated moments are resolved in the generality claimed.
Sources & referencesView supporting material
Primary source
Yuan Liu and Ken Willyard, “The imaginary case of the nonabelian Cohen–Lenstra heuristics”, arXiv:2507.21558 (2025).
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