Introduces a universal dimensionless metric for non-adiabatic phase-mode redistribution at defects in condensed media, supported by numerical simulations in a 50-level bosonic basis and a scaling law.
Philbin , Ulf Leonhardt, Observation of negative -frequency waves in a water tank: a classical analogue to the Hawking effect, New Journal of Physics, 10 (5), (2008) 053015
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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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Bogoliubov mode dynamics and non-adiabatic transitions in time-varying condensed media
Introduces a universal dimensionless metric for non-adiabatic phase-mode redistribution at defects in condensed media, supported by numerical simulations in a 50-level bosonic basis and a scaling law.