Linial–Meshulam torsion-freeness conjecture for first homology

Let Yd(n,p)Y_d(n,p) denote the Linial–Meshulam random dd-dimensional simplicial complex, and let c2c_2 be the constant appearing in the homological phase transition. A sequence p=p(n)p=p(n) has npc2|np-c_2| bounded away from 00 if there is a positive constant ε\varepsilon such that npc2ε|np-c_2|\geq \varepsilon for all sufficiently large nn. Torsion-freeness conjecture. For every such p=p(n)p=p(n), H1(Yd(n,p);Z)H_{1}(Y_d(n,p);\mathbb{Z}) is torsion-free with high probability. The conjecture concerns the apparent absence of torsion in first homology away from the critical window around c2c_2; extensive experiments support it, but the statement is presented as unproved.

Sources & referencesView supporting material

Primary source

Andrew Newman, “On freeness of the random fundamental group”, arXiv:1601.07520 (2017).

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