Finite-reinforcement percolation conjecture for planar reinforced 2-out percolation

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Consider the finite-α\alpha reinforced kk-out percolation model on Zd\mathbb Z^d, and let E∞\mathcal E_\infty be the set of edges that are eventually reinforced in every round. In the limiting case α=∞\alpha=\infty, this is the corresponding infinitely reinforced-edge configuration.

Finite-reinforcement percolation conjecture. Assume that d=k=2d=k=2. Then there exists α0>0\alpha_0>0 such that

P(E∞ percolates)=1\mathbb P\big(\mathcal E_\infty\text{ percolates}\big)=1

whenever α>α0\alpha>\alpha_0.

This conjecture extends the limiting-model percolation conjecture to sufficiently large but finite reinforcement exponents. The paper presents it as plausible but does not prove it, so its resolution remains open.

References

Primary source

Gideon Amir, Markus Heydenreich and Christian Hirsch, “Planar reinforced k-out percolation”, arXiv:2407.12484 (2024).

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