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Fluctuation bounds for first-passage percolation

Scott Armstrong, Ahmed Bou-Rabee

Palomar Registrypalomar/PALOMAR-2026-11-01-000017Nov 1, 2026math.PRscore 0

A Lean 4 / Mathlib formalization of two papers of S. Armstrong and A. Bou-Rabee on the fluctuations of passage times in first-passage percolation. "Curvature and variance in lattice first-passage percolation": for independent, identically distributed edge weights on Z^d, d >= 2, whose law nu has an exponential moment and nu({0}) below the critical probability of bond percolation (Assumption (W)), and for constants delta in (0, 1], r > 0, Lambda >= 0 and lambda > 0, there are epsilon > 0 and C such that E exp(|T(0, x) - mu(x)| / (C |x|^((1 - epsilon)/2))) = 2, with chi smooth, radial and…

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