Kimura's large-genus boundary-volume asymptotic conjecture

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Let Vg,n(L1,…,Ln)V_{g,n}(L_1,\ldots,L_n) denote the Weil–Petersson volume with boundary lengths L=(L1,…,Ln)\mathbf{L}=(L_1,\ldots,L_n). For any given n≥0n\geq 0 and boundary lengths L\mathbf{L}, consider the limit as g→∞g\to\infty.

Kimura's conjecture. For any given n≥0n\geq 0 and boundary lengths L=(L1,…,Ln)\mathbf{L}=(L_1,\ldots,L_n), as g→∞g\to\infty,

Vg,n(L1,…,Ln)∼2π(4π2)2g−3+nΓ(2g+n−52)∏i=1nsinh⁡(Li/2)Li/2.V_{g,n}(L_1,\ldots,L_n)\sim\sqrt{\frac{2}{\pi}}(4\pi^2)^{2g-3+n}\Gamma\left(2g+n-\frac{5}{2}\right)\prod_{i=1}^{n}\frac{\operatorname{sinh}(L_i/2)}{L_i/2}.

This predicts the leading large-genus behavior of Weil–Petersson volumes with prescribed boundary lengths and extends the corresponding asymptotics for volumes without boundary lengths. The source does not state a resolution of the conjecture.

References

Primary source

Xuanyu Huang, “Asymptotic coefficients of Weil-Petersson volumes in the large genus”, arXiv:2501.06421 (2025).

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