Commutation of deformation and scaling limits for the Laplace-Beltrami operator

Let Ω1\Omega_1 and Ω2\Omega_2 be the regions supporting deformations with parameters ϵ1\epsilon_1 and ϵ2\epsilon_2, let \IceMountain{\text{\IceMountain}} be the Laplace-Beltrami operator on the deformed triangulation, and let \IceMountaincr{\text{\IceMountain}}_{\mathrm{cr}} be the operator for the critical triangulation TcrT_{\mathrm{cr}}. Let δ1\IceMountain\delta_1{\text{\IceMountain}} and δ2\IceMountain\delta_2{\text{\IceMountain}} denote the corresponding first variations, and let F1,F2F_1,F_2 be the associated deformation fields.

Commutation-of-limits conjecture. For sufficiently small ϵ1\epsilon_1 and ϵ2\epsilon_2, the scaling limit exists uniformly with respect to TcrT_{\mathrm{cr}}; the deformation limits are uniform and commute with the scaling limit, with

limϵ10ϵ20lim1ϵ1ϵ2tr[δ1\IceMountain\IceMountaincr1δ2\IceMountain\IceMountaincr1]=limlimϵ10ϵ201ϵ1ϵ2tr[δ1\IceMountain\IceMountaincr1δ2\IceMountain\IceMountaincr1]=Ω1×Ω2dx1dx2ˉF1(x1)ˉF2(x2)(x1x2)4+c.c.\lim_{\substack{\epsilon_1\to0\epsilon_2\to0}}\lim_{\ell\to\infty}\frac{1}{\epsilon_1\epsilon_2}\operatorname{tr}\left[\delta_1{\text{\IceMountain}}\cdot{\text{\IceMountain}}_{\mathrm{cr}}^{-1}\cdot\delta_2{\text{\IceMountain}}\cdot{\text{\IceMountain}}_{\mathrm{cr}}^{-1}\right] =\lim_{\ell\to\infty}\lim_{\substack{\epsilon_1\to0\epsilon_2\to0}}\frac{1}{\epsilon_1\epsilon_2}\operatorname{tr}\left[\delta_1{\text{\IceMountain}}\cdot{\text{\IceMountain}}_{\mathrm{cr}}^{-1}\cdot\delta_2{\text{\IceMountain}}\cdot{\text{\IceMountain}}_{\mathrm{cr}}^{-1}\right] =\iint_{\Omega_1\times\Omega_2}dx_1\,dx_2\,\frac{\bar\partial F_1(x_1)\bar\partial F_2(x_2)}{(x_1-x_2)^4}+\text{c.c.}

The conjecture asserts that the perturbative and thermodynamic/scaling limits can be interchanged without geometric restrictions on the infinite critical triangulation. The paper presents it as an unresolved claim motivated by uniform estimates.

Sources & referencesView supporting material

Primary source

Francois David and Jeanne Scott, “Perturbing Isoradial Triangulations”, arXiv:2111.13560 (2023).

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