Observation of negative-frequency waves in a water tank: A classical analogue to the Hawking effect?

2007/11/30 by Germain Rousseaux, Christian Mathis, Philippe Maissa +2 · 1 citation
Physics and Astronomy · #gr-qc

paper · pdf · doi:10.1088/1367-2630/10/5/053015

published as NewJ.Phys.10:053015,2008

arxiv created 2008/03/01 · arxiv updated 2009/12/01

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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