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dc.contributor.authorCromb, Marion
dc.contributor.authorGibson, Graham M.
dc.contributor.authorToninelli, Ermes
dc.contributor.authorPadgett, Miles J.
dc.contributor.authorWright, Ewan M.
dc.contributor.authorFaccio, Daniele
dc.date.accessioned2020-08-10T20:42:01Z
dc.date.available2020-08-10T20:42:01Z
dc.date.issued2020-06-22
dc.identifier.citationCromb, M., Gibson, G.M., Toninelli, E. et al. Amplification of waves from a rotating body. Nat. Phys. (2020). https://doi.org/10.1038/s41567-020-0944-3en_US
dc.identifier.issn1745-2473
dc.identifier.doi10.1038/s41567-020-0944-3
dc.identifier.urihttp://hdl.handle.net/10150/642212
dc.description.abstractAcoustic waves that carry orbital angular momentum are amplified as they pass through an absorbing disk when the rotation rate exceeds the frequency of the incident wave, thus providing an experimental demonstration of Zel'dovich amplification. In 1971, Zel'dovich predicted that quantum fluctuations and classical waves reflected from a rotating absorbing cylinder will gain energy and be amplified. This concept, which is a key step towards the understanding that black holes may amplify quantum fluctuations, has not been verified experimentally owing to the challenging experimental requirement that the cylinder rotation rate must be larger than the incoming wave frequency. Here, we demonstrate experimentally that these conditions can be satisfied with acoustic waves. We show that low-frequency acoustic modes with orbital angular momentum are transmitted through an absorbing rotating disk and amplified by up to 30% or more when the disk rotation rate satisfies the Zel'dovich condition. These experiments address an outstanding problem in fundamental physics and have implications for future research into the extraction of energy from rotating systems.en_US
dc.language.isoenen_US
dc.publisherNATURE PUBLISHING GROUPen_US
dc.rights© 2020 Springer Nature Limited.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleAmplification of waves from a rotating bodyen_US
dc.typeArticleen_US
dc.identifier.eissn1745-2481
dc.contributor.departmentUniv Arizona, Wyant Coll Opt Scien_US
dc.identifier.journalNATURE PHYSICSen_US
dc.description.note6 month embargo; published online: 22 June 2020en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal accepted manuscripten_US
dc.identifier.pii944
dc.source.journaltitleNature Physics


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