Cocompact trace-set volume conjecture for large-genus hyperbolic surfaces

Let VgϵV_g^\epsilon and Vgϵ\overline{V_g^\epsilon} be the sets defined in Theorem~, and let Mg\mathcal{M}_g be the corresponding moduli space of genus-gg surfaces, with Weil--Petersson volume denoted by VolWP\mathrm{Vol}_{\mathrm{WP}}. Cocompact trace-set volume conjecture. There exists a number 0<ϵ<10<\epsilon<1 such that, for sufficiently large genus gg,

VolWP(Vgϵ)VolWP(Mg)=1.\frac{\mathrm{Vol}_{\mathrm{WP}}(\overline{V_g^\epsilon})}{\mathrm{Vol}_{\mathrm{WP}}(\mathcal{M}_g)}=1.

The assertion predicts that, for some fixed positive exponent parameter, the relevant cocompact surfaces asymptotically occupy all Weil--Petersson volume in large genus. The source presents this as a conjecture and gives no further resolution evidence.

Sources & referencesView supporting material

Primary source

Yanlong Hao, “On trace set of hyperbolic surfaces and a conjecture of Sarnak and Schmutz”, arXiv:2410.05223 (2025).

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