Werner's critical-cluster scaling-limit conjecture

For functions ff and gg depending on the dimension dd, define

(fg)(d):=f(d)\mathbbm1d6+g(d)\mathbbm1d>6.(f \boxdot g)(d):=f(d)\mathbbm{1}_{d\le 6}+g(d)\mathbbm{1}_{d>6}.

Here a critical cluster is either a loop cluster of L~1/2\widetilde{\mathcal{L}}_{1/2} or, when non-empty, a positive cluster C0(v)\mathcal{C}^{\ge 0}(v); these have the same distribution. For any 3d53\le d\le 5 and d7d\ge 7, Werner's conjecture. the scaling limit of critical clusters exists and has fractal dimension

(d2+1)4.\left(\frac{d}{2}+1\right)\boxdot 4.

This conjecture concerns the geometry of critical clusters in Gaussian free fields and loop soups. The supplied text does not state whether the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Zhenhao Cai and Jian Ding, “Incipient infinite clusters and volume growth for Gaussian free fields and loop soups on metric graphs”, arXiv:2412.05709 (2025).

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