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

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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

lim⁡ϵ1→0ϵ2→0lim⁡ℓ→∞1ϵ1ϵ2tr⁡[δ1\IceMountain⋅\IceMountaincr−1⋅δ2\IceMountain⋅\IceMountaincr−1]=lim⁡ℓ→∞lim⁡ϵ1→0ϵ2→01ϵ1ϵ2tr⁡[δ1\IceMountain⋅\IceMountaincr−1⋅δ2\IceMountain⋅\IceMountaincr−1]=∬Ω1×Ω2dx1 dx2 ∂ˉF1(x1)∂ˉF2(x2)(x1−x2)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.

References

Primary source

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

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