FUSF connectedness threshold conjecture for supercritical random planar maps

From papers

Let Mk\mathcal M_k be the supercritical random planar map, and let its free uniform spanning forest (FUSF) be the forest obtained from the free boundary condition. FUSF connectedness threshold conjecture. If Q>5/2Q>\sqrt{5/2}, equivalently c>16{\mathbf{c}}>16, then almost surely the FUSF on Mk\mathcal M_k is connected and consists of a single tree. If Q<5/2Q<\sqrt{5/2}, equivalently c<16{\mathbf{c}}<16, then on the event that Mk\mathcal M_k has infinitely many vertices, the FUSF almost surely has infinitely many connected components. The threshold is motivated by the Euclidean Hausdorff dimension 5/45/4 of SLE2_2 and the expected scaling of loop-erased random walk; the critical value is not addressed.

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Primary source

Ewain Gwynne and Jinwoo Sung, “Random walk reflected off of infinity, with applications to uniform spanning forests and supercritical Liouville quantum gravity”, arXiv:2506.18827 (2026).

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