Nondegenerate scaling limits for Wick powers of the loop-soup field

Let θ(0,1/2)\theta \in (0,1/2), let hθ,Nh_{\theta,N} be the discrete loop-soup field, and define its Wick powers by

:hθ,N(x)xn:=hθ,N(x)G(x,x)nLn(1θ)(x/G(x,x)),:h_{\theta,N}(x) \ell_x^n: = h_{\theta,N}(x) G(x,x)^n \mathbf{L}_n^{(1-\theta)}(\ell_x/G(x,x)),

where G(x,x)G(x,x) is the relevant Green function and Ln(1θ)\mathbf{L}_n^{(1-\theta)} is the Laguerre polynomial. Let LDNθ\mathcal{L}_{D_N}^\theta be the discrete loop soup, and let HεH^{-\varepsilon} and L\mathfrak{L} denote the spaces used for the field and loop-soup components. The Wick-power scaling-limit conjecture. For any n01n_0\geq 1, the joint law converges in distribution as

(hθ,N,(:hθ,Nn:)n=1n0,LDNθ)N(d)(hθconj,(:hθconjLn:)n=1n0,LDθ).\left(h_{\theta,N}, (:h_{\theta,N} \ell^n:)_{n=1 \dots n_0}, \mathcal{L}_{D_N}^\theta\right) \xrightarrow[N\to\infty]{\mathrm{(d)}} \left(h_\theta^{\mathrm{conj}}, (:h_\theta^{\mathrm{conj}} L^n:)_{n=1 \dots n_0}, \mathcal{L}_D^\theta\right).

The convergence holds in (Hε)n0×L(H^{-\varepsilon})^{n_0}\times\mathfrak{L} for every ε>0\varepsilon>0, and the limiting fields are measurable with respect to LDθ\mathcal{L}_D^\theta. This conjecture proposes scaling limits for the renormalised odd powers not covered by the already defined integer local-time powers; the existence and nondegeneracy of these limits remain open.

Sources & referencesView supporting material

Primary source

Antoine Jego, Titus Lupu and Wei Qian, “Conformally invariant fields out of Brownian loop soups”, arXiv:2307.10740 (2023).

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