Polyakov triangulation conjecture for Liouville measure on higher-genus surfaces

From papers

Let MM be a surface of genus g{\bf g}, let TN,g\mathcal{T}_{N,\mathbf{g}} denote the set of triangulations of size NN, and let νa\nu_a be the random measure defined by

Ea[F(νa)]=1ZaN1eμˉNTTN,gF(eφTdvgτT),\mathbb{E}^{a}[F(\nu_a)]=\frac{1}{Z_a}\sum_{N\geqslant 1}e^{-\bar\mu N}\sum_{T\in\mathcal{T}_{N,\mathbf{g}}}F(e^{\varphi_T}\,d\operatorname{v}_{g_{\tau_T}}),

for positive bounded functions FF, where ZaZ_a normalizes the expectation and Pa\mathbb{P}^a is the associated probability law. Set

μˉ=μc+a2μ,\bar\mu=\mu_c+a^2\mu,

with fixed μ>0\mu>0. Polyakov's triangulation conjecture. Under Pa\mathbb{P}^a, the random measure νa\nu_a converges in law as a0a\to0, in the space of Radon measures with the topology of weak convergence, to the Liouville measure Lγ\mathcal{L}_\gamma under E(gτ)τ,μ[]\mathbb{E}_{(g_\tau)_\tau,\mu}[\cdot], with parameter γ=83\gamma=\sqrt{\frac{8}{3}}. This conjecture identifies the continuum scaling limit of random triangulated surfaces with Liouville quantum gravity; analogous conjectures for the sphere, disk, and torus are described as completely open in the source, although partial progress is known under an unproved condition.

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Sources & referencesView supporting material

Primary source

Colin Guillarmou, Rémi Rhodes and Vincent Vargas, “Polyakov's formulation of 2d bosonic string theory”, arXiv:1607.08467 (2019).

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