English

Uniform spectral gaps for random hyperbolic surfaces with not many cusps

Differential Geometry 2026-02-10 v1 Complex Variables Geometric Topology Spectral Theory

Abstract

In this paper, we investigate uniform spectral gaps for Weil-Petersson random hyperbolic surfaces with not many cusps. We show that if n=O(gα)n=O(g^\alpha) where α[0,12)\alpha\in \left[0,\frac{1}{2}\right), then for any ϵ>0\epsilon>0, a random cusped hyperbolic surface in Mg,n\mathcal{M}_{g,n} has no eigenvalues in (0,14(16(1α))2ϵ)\left(0,\frac{1}{4}-\left(\frac{1}{6(1-\alpha)}\right)^2-\epsilon\right). If α\alpha is close to 12\frac{1}{2}, this gives a new uniform lower bound 536ϵ\frac{5}{36}-\epsilon for the spectral gaps of Weil-Petersson random hyperbolic surfaces. The major contribution of this work is to reveal a critical phenomenon of ``second order cancellation".

Keywords

Cite

@article{arxiv.2602.08352,
  title  = {Uniform spectral gaps for random hyperbolic surfaces with not many cusps},
  author = {Yuxin He and Yunhui Wu and Yuhao Xue},
  journal= {arXiv preprint arXiv:2602.08352},
  year   = {2026}
}

Comments

136 pages, 11 figures. Comments are welcome

R2 v1 2026-07-01T10:27:24.242Z