Przytycki's phase-transition conjecture for random group actions on CAT(0) cube complexes

Let SS be a finite set of generators, let d(0,1)d\in(0,1) be a density, and consider a random group in the Gromov density model with density dd and relator length tending to infinity. A group acts without a global fixed point on a finite-dimensional CAT(0)\mathrm{CAT}(0) cube complex if it has no point fixed by the whole group. Przytycki's phase-transition conjecture. Random groups act without a global fixed point on finite-dimensional CAT(0)\mathrm{CAT}(0) cube complexes at densities d<14d<\frac14 and have property (T) at densities d>14d>\frac14, with overwhelming probability. The conjecture predicts a sharp phase transition at density 14\frac14, complementing the known positive results below 14\frac14 and the known property (T) results above 13\frac13; the intermediate range remains unresolved.

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Primary source

Zachary Munro, “Random Group Actions on CAT(0) Square Complexes”, arXiv:2210.06378 (2022).

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