The test-function convergence conjecture for discrete curvature on LQG maps

Let {Mn}n1\{M_n\}_{n\geq1} be a sequence of infinite random planar maps believed to lie in the universality class of γ\gamma-LQG, such as uniform infinite triangulations when γ=8/3\gamma=\sqrt{8/3}. Embed each map in the plane using any reasonable embedding, such as the circle-packing or Tutte embedding. Let cnc_n be an appropriate scaling factor, let f:CRf:\mathbb{C}\to\mathbb{R} be a compactly supported C2C^2 test function, and let Φ\Phi be an appropriate variant of the Gaussian free field, with curvature KΦK_\Phi and LQG measure μΦ\mu_\Phi. The test-function convergence conjecture.

1cnvVMnf(v)KMn(v)dCf(z)KΦ(z)dμΦ(z).\frac{1}{c_n}\sum_{v\in\mathcal{V}M_n}f(v)K_{M_n}(v)\xrightarrow{d}\int_{\mathbb{C}}f(z)K_\Phi(z)\,d\mu_\Phi(z).

Moreover, convergence in distribution holds jointly for every finite collection of Cc2C_c^2 test functions. This gives a precise distributional formulation of the proposed discrete-to-continuum curvature limit, while the appropriate normalization and embedding are left at the level stated in the conjecture.

Sources & referencesView supporting material

Primary source

Andres Contreras Hip and Ewain Gwynne, “Gaussian curvature on random planar maps and Liouville quantum gravity”, arXiv:2406.08674 (2024).

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