Large-genus Brownian-surface geodesic length spectrum conjecture

Let Sg\mathbf{S}_{g} be the Brownian surface of genus gg with no boundary introduced in Bettinelli (2022). Define Ξg\Xi_g to be the multiset of lengths of closed geodesics on Sg\mathbf{S}_g, in the sense of shortest closed paths in their homotopy class. Let c>0c>0 be an absolute constant, and let P\mathcal{P} be a Poisson point process on R+\mathbb{R}_{+} with intensity

cosht1tdt.\frac{\cosh t-1}{t}\,\mathrm{d}t.

Large-genus Brownian-surface geodesic length spectrum conjecture. As gg\to\infty, the random point process cΞgc\,\Xi_g converges in distribution to P\mathcal{P}:

cΞgg(d)P.c\,\Xi_g\xrightarrow[g\to\infty]{\mathrm{(d)}}\mathcal{P}.

Here Ξg\Xi_g is regarded as a random point process on [0,)[0,\infty). This conjecture proposes that the limiting Poisson point process found for large-genus random hyperbolic surfaces also describes the rescaled closed-geodesic length spectrum of Brownian surfaces; its resolution is not given in the source.

Sources & referencesView supporting material

Primary source

Timothy Budd and Tanguy Lions, “The tight length spectrum of large-genus random hyperbolic surfaces with many cusps”, arXiv:2506.02611 (2026).

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