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  On the spectrum of differential operators under Riemannian coverings

Polymerakis, P. (2020). On the spectrum of differential operators under Riemannian coverings. Journal of Geometric Analysis, 30(3), 3331-3370. doi:10.1007/s12220-019-00196-1.

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arXiv:1803.03223.pdf (Preprint), 350KB
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© The Author(s) 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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https://doi.org/10.1007/s12220-019-00196-1 (Publisher version)
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Polymerakis, Panagiotis1, Author              
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1Max Planck Institute for Mathematics, Max Planck Society, ou_3029201              

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Free keywords: Mathematics, Differential Geometry, Spectral Theory
 Abstract: For a Riemannian covering $p \colon M_{2} \to M_{1}$, we compare the spectrum of an essentially self-adjoint differential operator $D_{1}$ on a bundle $E_{1} \to M_{1}$ with the spectrum of its lift $D_{2}$ on $p^{*}E_{1} \to M_{2}$. We prove that if the covering is infinite sheeted and amenable, then the spectrum of $D_{1}$ is contained in the essential spectrum of any self-adjoint extension of $D_{2}$. We show that if the deck transformations group of the covering is infinite and $D_{2}$ is essentially self-adjoint (or symmetric and bounded from below), then $D_{2}$ (or the Friedrichs extension of $D_{2}$) does not have eigenvalues of finite multiplicity and in particular, its spectrum is essential. Moreover, we prove that if $M_{1}$ is closed, then $p$ is amenable if and only if it preserves the bottom of the spectrum of some/any Schr\"{o}dinger operator, extending a result due to Brooks.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: 40
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 Table of Contents: -
 Rev. Type: Peer
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Title: Journal of Geometric Analysis
  Abbreviation : J. Geom. Anal.
Source Genre: Journal
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Publ. Info: Springer
Pages: - Volume / Issue: 30 (3) Sequence Number: - Start / End Page: 3331 - 3370 Identifier: -