Observation of Noise Correlated by the Hawking Effect in a Water Tank
| Autor: | Thomas G. Philbin, Germain Rousseaux, Renaud Parentani, Léo-Paul Euvé, Florent Michel |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
010308 nuclear & particles physics Scattering Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences General Physics and Astronomy Spectral density Physics - Fluid Dynamics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences Measure (mathematics) General Relativity and Quantum Cosmology 6. Clean water symbols.namesake Correlation function (statistical mechanics) Free surface 0103 physical sciences Froude number symbols Atomic physics 010306 general physics Noise (radio) Hawking radiation |
| Zdroj: | Physical Review Letters. 117 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.117.121301 |
| Popis: | 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. Comment: 11 pages, 14 figures. several points clarified; two new subsections in the Supplemental Material on the wave equation and the links with experiments in BECs |
| Databáze: | OpenAIRE |
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