Delecroix–Goujard–Zograf–Zorich frequency-ratio conjecture for simple closed geodesics

From papers

Let XX be a hyperbolic surface of genus gg with nn cusps. A simple closed geodesic is a closed geodesic without self-intersections; it is separating if it splits XX into two parts and nonseparating otherwise. Write cg,n,sepc_{g,n,sep} and cg,n,nonsepc_{g,n,nonsep} for the corresponding frequencies.

Delecroix–Goujard–Zograf–Zorich conjecture. The ratio of frequencies of separating over nonseparating simple closed geodesics admits the uniform asymptotics

cg,n,sepcg,n,nonsep=23πg14gf(ng)(1+ε(g,n)),\frac{c_{g,n,sep}}{c_{g,n,nonsep}}=\sqrt{\frac{2}{3\pi g}}\cdot\frac{1}{4^g}\cdot f\left(\frac{n}{g}\right)\cdot\left(1+\varepsilon(g,n)\right),

where f:[0,)Rf:[0,\infty)\mapsto\mathbb{R} is continuous and increases monotonically from f(0)=1f(0)=1 to f()=2f(\infty)=\sqrt{2}, and the error term ε(g,n)\varepsilon(g,n) tends to 00 as gg\to\infty uniformly in nn.

This conjecture predicts the large-genus asymptotic ratio of separating to nonseparating simple closed geodesic frequencies and expresses its dependence on the cusp-to-genus ratio through the function ff. The source presents it as a conjecture from Delecroix, Goujard, Zograf and Zorich; no resolution is supplied here.

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Sources & referencesView supporting material

Primary source

Irene Ren, “Mirzakhani's frequencies of simple closed geodesics on hyperbolic surfaces in large genus and with many cusps”, arXiv:2304.03734 (2025).

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