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Publication . Article . Preprint . 2010 . Embargo end date: 01 Jan 2010

Measurement of stimulated Hawking emission in an analogue system

Silke Weinfurtner; Edmund W. Tedford; Matthew C. J. Penrice; William G. Unruh; Gregory A. Lawrence;
Open Access
Abstract
There is a mathematical analogy between the propagation of fields in a general relativistic space-time and long (shallow water) surface waves on moving water. Hawking argued that black holes emit thermal radiation via a quantum spontaneous emission. Similar arguments predict the same effect near wave horizons in fluid flow. By placing a streamlined obstacle into an open channel flow we create a region of high velocity over the obstacle that can include wave horizons. Long waves propagating upstream towards this region are blocked and converted into short (deep water) waves. This is the analogue of the stimulated emission by a white hole (the time inverse of a black hole), and our measurements of the amplitudes of the converted waves demonstrate the thermal nature of the conversion process for this system. Given the close relationship between stimulated and spontaneous emission, our findings attest to the generality of the Hawking process.
Comment: 7 pages, 5 figures. This version corrects a processing error in the final graph 5b which multiplied the vertical axis by 2. The graph, and the data used from it, have been corrected. Some minor typos have also been corrected. This version also uses TeX rather than Word
Subjects by Vocabulary

arXiv: General Relativity and Quantum Cosmology Astrophysics::High Energy Astrophysical Phenomena

Microsoft Academic Graph classification: Surface wave White hole Stimulated emission Quantum electrodynamics Quantum mechanics Thermal radiation Gravitational wave Quantum field theory in curved spacetime Physics Spontaneous emission Black hole

Subjects

General Relativity and Quantum Cosmology (gr-qc), Fluid Dynamics (physics.flu-dyn), FOS: Physical sciences, General Physics and Astronomy, General Relativity and Quantum Cosmology, Physics - Fluid Dynamics

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