Nested CLE scaling-limit conjecture for the fuzzy Potts model

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Let q∈(0,4]q\in (0,4] and let

κ′=4π/arccos⁡(−q/2)∈[4,8).\kappa'=4\pi/\arccos(-\sqrt{q}/2) \in [4,8).

Suppose that DD is a Jordan domain, ϵn→0\epsilon_n\to 0 as n→∞n\to\infty, and that Dn\mathcal{D}_n is a discrete domain in ϵnZ2\epsilon_n\mathbb{Z}^2 for each n≥1n\geq 1 such that Dn\mathcal{D}_n converges to DD as n→∞n\to\infty. Let ωn∼ϕDn,q0\omega^n\sim\phi^0_{\mathcal{D}_n,q}, let Γ\Gamma be a nested CLE⁡κ′\operatorname{CLE}_{\kappa'} in DD, let Γ∂\Gamma^\partial be the loops in Γ\Gamma intersecting ∂D\partial D, and let Γωn\Gamma_{\omega^n} and Γωn∂\Gamma^\partial_{\omega^n} denote the corresponding discrete loop collections. Nested CLE scaling-limit conjecture. The pair

(Γωn∖Γωn∂,Γωn∂)(\Gamma_{\omega^n}\setminus \Gamma^\partial_{\omega^n},\Gamma^\partial_{\omega^n})

converges in distribution to

(Γ∖Γ∂,Γ∂)(\Gamma\setminus \Gamma^\partial,\Gamma^\partial)

with respect to the metric dLd_{\mathcal{L}}. This conjecture identifies the scaling limit of the nested loop encoding of the fuzzy Potts model; it is known only for q=2q=2, corresponding to κ′=16/3\kappa'=16/3, while the general case remains open.

References

Primary source

Laurin Köhler-Schindler and Matthis Lehmkuehler, “The fuzzy Potts model in the plane: Scaling limits and arm exponents”, arXiv:2209.12529 (2025).

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