Amplification of waves from a rotating body

Marion Cromb, Graham M. Gibson, Ermes Toninelli, Miles J. Padgett, Ewan M. Wright, Daniele Faccio

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
JournalNature Physics
DOIs
StateAccepted/In press - 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Cromb, M., Gibson, G. M., Toninelli, E., Padgett, M. J., Wright, E. M., & Faccio, D. (Accepted/In press). Amplification of waves from a rotating body. Nature Physics. https://doi.org/10.1038/s41567-020-0944-3