On the spectral stability of finite coverings
Werner Ballmann, Sugata Mondal, Panagiotis Polymerakis · arXiv (Cornell University) · 2025
We prove the non-existence of new eigenvalues in $[0,Λ]$ for specific and random finite coverings of a complete and connected Riemannian manifold $M$ with Ricci curvature bounded from below, where $Λ$ 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.