The post-FKG conjecture for connection probabilities

Let GG be a finite graph with arbitrary probabilities on its edges. Let 0,bG0,b\in G be vertices and let AGA\subset G be a set of vertices. The post-FKG conjecture.

P(0b)P(0A)min{P(ab):aA}.\mathbb{P}(0\leftrightarrow b)\ge \mathbb{P}(0\leftrightarrow A)\min\{\mathbb{P}(a\leftrightarrow b):a\in A\}.

This is an FKG-like inequality proposed as an approach to proving θ(pc)=0\theta(p_c)=0 in percolation. The authors state that they could neither prove nor disprove it, with only restricted numerical evidence and proofs in several special cases.

Sources & referencesView supporting material

Primary source

Gady Kozma and Shahaf Nitzan, “A reduction of the θ(p_c) = 0 problem to a conjectured inequality”, arXiv:2401.12397 (2024).

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