UIMS origin-loop tail exponent conjecture

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Let (M,Γ)(\mathcal M,\Gamma) be the planar map and loop collection associated with the UIMS, and let ℓ0\ell_0 be the loop or infinite path in Γ\Gamma passing through 0∈Z0\in\mathbb Z. Write dd for the exponent appearing in the paper's graph-distance bound and set α=12(3−2)\alpha=\frac12(3-\sqrt2). UIMS origin-loop tail conjecture. As k→∞k\to\infty,

P\originalleft[diam⁡M(ℓ0)≥k\aftergroup\originalright]≥k−d(1−α)−o(1),\mathbb P\mathopen{}\mathclose\bgroup\originalleft[\operatorname{diam}_{\mathcal M}(\ell_0)\ge k\aftergroup\egroup\originalright]\ge k^{-d(1-\alpha)-o(1)},

and

P\originalleft[#{vertices in ℓ0}≥k\aftergroup\originalright]≥k−(1/α−1)−o(1).\mathbb P\mathopen{}\mathclose\bgroup\originalleft[\#\{\text{vertices in }\ell_0\}\ge k\aftergroup\egroup\originalright]\ge k^{-(1/\alpha-1)-o(1)}.

The paper states that the proven exponent is not expected to be optimal; these sharper lower-tail predictions remain open.

References

Primary source

Jacopo Borga, Ewain Gwynne and Minjae Park, “On the geometry of uniform meandric systems”, arXiv:2212.00534 (2023).

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