Observation of negative-frequency waves in a water tank: A classical analogue to the Hawking effect?
arXiv:0711.4767 · doi:10.1088/1367-2630/10/5/053015
Abstract
The conversion of positive-frequency waves into negative-frequency waves at the event horizon is the mechanism at the heart of the Hawking radiation of black holes. In black-hole analogues, horizons are formed for waves propagating in a medium against the current when and where the flow exceeds the wave velocity. We report on the first direct observation of negative-frequency waves converted from positive-frequency waves in a moving medium. The measured degree of mode conversion is significantly higher than expected from theory.
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