Torsion-freeness conjecture for homology of random simplicial complexes

Let Yd(n,p)Y_d(n,p) be the random dd-dimensional simplicial complex, and let cdc_d^* be the real number such that p=cd/np=c_d^*/n is a one-sided sharp threshold for the non-triviality of Hd(Yd(n,p);R)H_d(Y_d(n,p);\mathbb R). For p=p(n)p=p(n), suppose that npcd|np-c_d^*| is bounded away from 00. Torsion-freeness conjecture. For every d2d\geq 2, the group Hd1(Yd(n,p);Z)H_{d-1}(Y_d(n,p);\mathbb Z) is torsion-free asymptotically almost surely. The conjecture predicts that torsion does not appear in random simplicial complexes in this regime; the source does not give a resolution.

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Primary source

Tomasz Łuczak and Yuval Peled, “Integral homology of random simplicial complexes”, arXiv:1607.06985 (2016).

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