CLEO®/Europe-EQEC 2019 Rotating spacetime and wave amplification in superfluids of light

Maria Chiara Braidotti, Radivoje Prizia, Calum Maitland, Angus Prain, Francesco Marino, Daniele Faccio

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Penrose superradiance is the amplification of waves scattered by a rapidly rotating object. This process was proposed in 1969 by Penrose for a rotating black hole [1] and in 1971 by Zel'dovich for electromagnetic waves scattered by a metallic rotating cylinder [2]. Wave whose angular frequency ω satisfies the condition ω < mΩ are amplified, where m is the waves' angular momentum and Ω is the cylinder's angular velocity. Superradiant scattering is not unique to for electromagnetic waves. Recently a direct measurement of superradiance in water waves has been reported in a draining bathtub experiment [3].

Original languageEnglish
Title of host publicationEuropean Quantum Electronics Conference 2019
PublisherOSA Publishing
ISBN (Electronic)9781557528209
Publication statusPublished - 23 Jun 2019
EventEuropean Quantum Electronics Conference 2019 - Munich, Germany
Duration: 23 Jun 201927 Jun 2019


ConferenceEuropean Quantum Electronics Conference 2019
Abbreviated titleEQEC 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


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