Sharp and ordered phase transitions for giant homological cycles

Let dd be the dimension of the torus and let λ0,k\lambda_{0,k} and λ1,k\lambda_{1,k} denote the lower and upper thresholds for the appearance of giant kk-cycles, while λc\lambda_c and λˉc\bar \lambda_c are the thresholds for the giant component and the final giant cycle, respectively. For 0<k<d0<k<d, define λk:=λ0,k=λ1,k\lambda_k:=\lambda_{0,k}=\lambda_{1,k}. Sharp and ordered phase-transition conjecture. For all 0<k<d0<k<d we have λ0,k=λ1,k:=λk\lambda_{0,k}=\lambda_{1,k}:=\lambda_k, and, in addition,

λc=λ1<λ2<<λd1=λˉc.\lambda_c=\lambda_1<\lambda_2<\cdots<\lambda_{d-1}=\bar\lambda_c.

The conjecture strengthens the theorem's bounds by asserting sharpness of every phase transition and strict ordering of the thresholds at which giant cycles of successive dimensions appear; the paper states that proving this remains future work.

Sources & referencesView supporting material

Primary source

Omer Bobrowski and Primoz Skraba, “Homological Percolation: The Formation of Giant k-Cycles”, arXiv:2005.14011 (2020).

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