Kahle–Newman’s Cohen–Lenstra conjecture for determinantal hypertrees

Let TnT_n be a random 22-dimensional determinantal hypertree on the vertex set [n][n], and let pp be a prime. Write Γn,p\Gamma_{n,p} for the pp-torsion subgroup of H1(Tn,Z)H_1(T_n,\mathbb{Z}). For a finite abelian pp-group GG, let Aut(G)\operatorname{Aut}(G) denote its automorphism group. Kahle–Newman’s conjecture. The random group Γn,p\Gamma_{n,p} converges to the Cohen–Lenstra distribution: for every finite abelian pp-group GG,

limnP(Γn,pG)=1Aut(G)j=1(1pj).\lim_{n\to\infty}\mathbb{P}(\Gamma_{n,p}\cong G)=\frac{1}{|\operatorname{Aut}(G)|}\prod_{j=1}^{\infty}(1-p^{-j}).

The conjecture is false for p=2p=2, while it remains open for p>2p>2.

Sources & referencesView supporting material

Primary source

András Mészáros, “The 2-torsion of determinantal hypertrees is not Cohen-Lenstra”, arXiv:2404.02308 (2024).

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