Logarithmic corrections for four-dimensional loop percolation
Abstract
We study the one-arm probability of the discrete random-walk loop soup on ℤ4 at small positive intensity. Using the small-loop crossing and macroscopic attachment estimates of Gao, we prove that the expected capacity of the origin cluster formed by loops contained in a box grows at most as the square of the logarithm of the box radius. Consequently, there are constants α0,c,C,β>0 such that, for 0<α≤α0, cαR−2[log(R+2)]βα ≤ ℙα(0↔ BRc) ≤ CαR−2[log(R+2)]2. The interval (0,α0] is strictly subcritical. The upper bound rests on a simultaneous capacity estimate for neighborhoods of loop ranges, followed by an expansion over chains in which sufficiently small intermediate loops have been removed. A deterministic bound on the variation of the surviving scale sequences makes the expansion summable. The positive logarithmic-power lower bound is already known from work of Chang and Sapozhnikov; we give a proof using macroscopic attachments and a layer-cake argument, with constants uniform at small intensity. In particular, the one-arm exponent equals two, and the logarithm of its correction has order loglog R, for every fixed intensity in this interval. We also derive polynomial tail exponent one for the cardinality and capacity of the full cluster, determine their positive moment thresholds, and give an application to random wires.
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BibTeX
@misc{vogel2026logarithmic,
title = {{Logarithmic corrections for four-dimensional loop percolation}},
author = {Quirin Vogel},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06691},
eprint = {2611.06691},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06691},
}
RIS
TY - UNPB
TI - Logarithmic corrections for four-dimensional loop percolation
AU - Quirin Vogel
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06691
UR - https://arxiv.org/abs/2611.06691
AB - We study the one-arm probability of the discrete random-walk loop soup on ℤ^4 at small positive intensity. Using the small-loop crossing and macroscopic attachment estimates of Gao, we prove that the expected capacity of the origin cluster formed by loops contained in a box grows at most as the square of the logarithm of the box radius. Consequently, there are constants α_0,c,C,β>0 such that, for 0<α≤α_0, cαR^−2[log(R+2)]^βα ≤ ℙ_α(0↔ B_R^c) ≤ CαR^−2[log(R+2)]^2. The interval (0,α_0] is strictly subcritical. The upper bound rests on a simultaneous capacity estimate for neighborhoods of loop ranges, followed by an expansion over chains in which sufficiently small intermediate loops have been removed. A deterministic bound on the variation of the surviving scale sequences makes the expansion summable. The positive logarithmic-power lower bound is already known from work of Chang and Sapozhnikov; we give a proof using macroscopic attachments and a layer-cake argument, with constants uniform at small intensity. In particular, the one-arm exponent equals two, and the logarithm of its correction has order loglog R, for every fixed intensity in this interval. We also derive polynomial tail exponent one for the cardinality and capacity of the full cluster, determine their positive moment thresholds, and give an application to random wires.
ER -