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On the spectral stability of finite coverings

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arxiv 2507.17466 v3 pith:CWCRJBHM submitted 2025-07-23 math.DG math.SP

On the spectral stability of finite coverings

classification math.DG math.SP
keywords belowcoveringsfinitelambdaspectrumboundedcertaincomplete
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We prove the non-existence of new eigenvalues in $[0,\Lambda]$ for specific and random finite coverings of a complete and connected Riemannian manifold $M$ with Ricci curvature bounded from below, where $\Lambda$ is any positive number below the essential spectrum of $M$ and the spectrum of the universal cover of $M$, provided the representation theory of the fundamental group of $M$ satisfies certain conditions.

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  1. Bass notes of random hyperbolic surfaces of large genus

    math.SP 2026-07 accept novelty 2.0

    A survey of recent results proving that random hyperbolic surfaces of large genus have near-optimal spectral gaps, after Hide–Magee, Anantharaman–Monk, and Hide–Macera–Thomas.