Enhanced Cohen–Lenstra distribution conjecture

Let n=(n1,,nk)\mathbf{n}=(n_1,\ldots,n_k) be a tuple of distinct positive integers, and let SS be a finite collection of primes not containing pp. For a geometric family Fg\mathcal{F}_g of abelian varieties over Fp\mathbb{F}_p, suppose that the Cohen–Lenstra distribution CLS\mathrm{CL}_S accurately models the distribution of A(Fp)SA(\mathbb{F}_p)_S for randomly sampled AFgA\in\mathcal{F}_g as gg grows.

Enhanced Cohen–Lenstra conjecture. The n\mathbf{n}-Cohen–Lenstra distribution CLn,S\mathrm{CL}_{\mathbf{n},S} accurately models the joint distribution of

A(Fpn1)S,,A(Fpnk)SA(\mathbb{F}_{p^{n_1}})_S,\ldots,A(\mathbb{F}_{p^{n_k}})_S

for randomly sampled AFgA\in\mathcal{F}_g as gg grows.

This conjecture extends the Cohen–Lenstra heuristic from the group of rational points over Fp\mathbb{F}_p to joint distributions over several finite extensions. The source gives no evidence of a resolution.

Sources & referencesView supporting material

Primary source

Michael Lipnowski and Jacob Tsimerman, “How Large is A_g(F_q)?”, arXiv:1511.02212 (2015).

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