Abstract
In \(\mathbb {Z}^d\) with \(d\ge 5\), we consider the time constant \(\rho _u\) associated to the chemical distance in random interlacements at low intensity \(u \ll 1\). We prove an upper bound of order \(u^{-1/2}\) and a lower bound of order \(u^{-1/2+\varepsilon }\). The upper bound agrees with the conjectured scale in which \(u^{1/2}\rho _u\) converges to a constant multiple of the Euclidean norm, as \(u\rightarrow 0\). Along the proof, we obtain a local lower bound on the chemical distance between the boundaries of two concentric boxes, which might be of independent interest. For both upper and lower bounds, the paper employs probabilistic bounds holding as \(u\rightarrow 0\); these bounds can be relevant in future studies of the low-intensity geometry.
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Acknowledgements
We would like to thank the anonymous referee, whose extremely dedicated and thorough work has greatly improved this paper. We would like to thank Balázs Ráth for insightful discussions that were greatly instrumental for the proof of Theorem 1. We would like to thank Artëm Sapozhnikov for insightful discussions that were greatly instrumental for the proof of Theorem 2, and for typing some of the proofs in Sect. 3.3.
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Hernández-Torres, S., Procaccia, E.B. & Rosenthal, R. The Chemical Distance in Random Interlacements in the Low-Intensity Regime. Commun. Math. Phys. 400, 1697–1737 (2023). https://doi.org/10.1007/s00220-023-04634-8
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DOI: https://doi.org/10.1007/s00220-023-04634-8