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

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Let {Mn}n≥1\{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:C→Rf:\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.

1cn∑v∈VMnf(v)KMn(v)→d∫Cf(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.

References

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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