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Observation of noise correlated by the Hawking effect in a water tank

We measured the power spectrum and two-point correlation function for the randomly fluctuating free surface on the downstream side of a stationary flow with a maximum Froude number $F_{\rm max} \approx 0.85$ reached above a localised obstacle. On such a flow the scattering of incident long wavelength modes is analogous to that responsible for black hole radiation (the Hawking effect). Our measurements of the noise show a clear correlation between pairs of modes of opposite energies. We also measure the scattering coefficients by applying the same analysis of correlations to waves produced by a wave maker.

preprint2016arXivOpen access
L. -P. EuvéF. MichelR. ParentaniT. G. PhilbinG. Rousseaux
gr-qcphysics.flu-dyn
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L. -P. EuvéF. MichelR. ParentaniT. G. PhilbinG. Rousseaux

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