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Phrase of the day: Rotational superradiance
'Water waves can gain energy when they scatter from a whirlpool-like vortex. That is the conclusion of physicists in Brazil, Canada and the UK, who are the first to observe a phenomenon called "rotational superradiant scattering". The team says that the effect could be used to study black-hole physics.'
Source: physicsworld.com
rotational black-hole vortex whirlpool-like scatter superradiant superradiance observe