A random cover of a compact hyperbolic surface has relative spectral gap 316-ε

Michael Magee, Frédéric Naud, Doron Puder

Research output: Contribution to journalArticlepeer-review

Abstract

Let X be a compact connected hyperbolic surface, that is, a closed connected orientable smooth surface with a Riemannian metric of constant curvature - 1. For each n∈ N, let Xn be a random degree-n cover of X sampled uniformly from all degree-n Riemannian covering spaces of X. An eigenvalue of X or Xn is an eigenvalue of the associated Laplacian operator Δ X or ΔXn. We say that an eigenvalue of Xn is new if it occurs with greater multiplicity than in X. We prove that for any ε> 0 , with probability tending to 1 as n→ ∞, there are no new eigenvalues of Xn below 316-ε. We conjecture that the same result holds with 316 replaced by 14.

Original languageEnglish
Pages (from-to)595-661
Number of pages67
JournalGeometric and Functional Analysis
Volume32
Issue number3
DOIs
StatePublished - Jun 2022

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