The automorphism-invariant positive-association percolation criterion

Let dd be the dimension, let Zd\mathbb{Z}^d carry a percolation measure P\mathbb{P}, let Λ2N,N,N\Lambda_{2N,N,N} denote the rectangular box appearing in the crossing event H(Λ2N,N,N)H(\Lambda_{2N,N,N}), and write 00 \leftrightarrow \infty for the event that the origin belongs to an infinite open cluster. A percolation measure is automorphism invariant if it is invariant under automorphisms of Zd\mathbb{Z}^d, and positively associated if increasing events are positively correlated.

Percolation criterion. There are an ϵ>0\epsilon>0 and an NNN \in \mathbb{N} such that, whenever P\mathbb{P} is an automorphism-invariant positively associated percolation measure on Zd\mathbb{Z}^d satisfying

P(H(Λ2N,N,N))1ϵ,\mathbb{P}\left(H\left(\Lambda_{2N,N,N}\right)\right)\geq 1-\epsilon,

then

P(0)>0.\mathbb{P}\left(0\leftrightarrow\infty\right)>0.

The conjecture is proposed as a sufficient criterion for proving continuity below the critical parameter in the enhancement-percolation setting; the supplied text gives no resolution, so its status remains open.

Sources & referencesView supporting material

Primary source

Paul Duncan, Benjamin Schweinhart and David Sivakoff, “On the Continuity of Enhancement Percolation”, arXiv:2509.10990 (2025).

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