Brownian loop-soup cluster expansion conjecture in fractional occupation fields

Fix c(0,1)c\in(0,1). Let LDc\mathcal L_D^c be a Brownian loop soup of central charge cc, let C\mathcal C be one of its clusters, and let :hcΘLDcn1::\mathtt h_c\Theta_{\mathcal L_D^c}^{n-1}: denote the hypothetical renormalized signed fractional occupation-field power. Brownian loop-soup cluster expansion conjecture. The ε\varepsilon-neighborhood of C\mathcal C, for both Euclidean distance and conformal radius, should admit an L2L^2 asymptotic expansion in the powers

logε(nc/2),n1,\lvert\log\varepsilon\rvert^{-(n-c/2)},\qquad n\geq1,

whose coefficient of logε(nc/2)\lvert\log\varepsilon\rvert^{-(n-c/2)} is a linear combination of the restricted fields σ(C):hcΘLDck1:C\sigma(\mathcal C):\mathtt h_c\Theta_{\mathcal L_D^c}^{k-1}:_{\vert\overline{\mathcal C}} for k{1,,n}k\in\{1,\dots,n\}. The renormalized intersection local times :ΘLDcn::\Theta_{\mathcal L_D^c}^{n}: should not appear, and the Euclidean and conformal-radius expansions should be related through MKS loop-measure moments.

Sources & referencesView supporting material

Primary source

Titus Lupu, “Relation between Wick powers and excursion clusters of the 2D GFF”, arXiv:2509.01797 (2025).

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