Wright's Friedman conjecture for random hyperbolic surfaces

Let XX be a random compact hyperbolic surface of genus gg, sampled according to the Weil–Petersson probability measure. Write NXΔ(0,a)N_X^\Delta(0,a) for the number of eigenvalues of the Laplacian ΔX\Delta_X in the interval (0,a)(0,a), counted with multiplicity. Wright's conjecture. For any sufficiently small ε>0\varepsilon>0,

limg+PgWP(NXΔ(0,14ε)=1)=1.\lim_{g\to+\infty}\mathbb{P}^{\mathrm{WP}}_g\left(N_X^\Delta\left(0,\frac14-\varepsilon\right)=1\right)=1.

Equivalently, for every fixed sufficiently small ε>0\varepsilon>0, with high probability the only eigenvalue below 14ε\frac14-\varepsilon is the trivial eigenvalue 00. This is the random-hyperbolic-surface analogue of Friedman's theorem for random regular graphs; the conjecture concerns the spectral gap under Weil–Petersson measure and remains open in the source.

Sources & referencesView supporting material

Primary source

Laura Monk, “Benjamini-Schramm convergence and spectrum of random hyperbolic surfaces of high genus”, arXiv:2002.00869 (2020).

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