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Foundations of Physics

, Volume 44, Issue 5, pp 532–545 | Cite as

Has Hawking Radiation Been Measured?

  • W. G. UnruhEmail author
Article

Abstract

It is argued that Hawking radiation has indeed been measured and shown to posses a thermal spectrum, as predicted. This contention is based on three separate legs. The first is that the essential physics of the Hawking process for black holes can be modelled in other physical systems. The second is the white hole horizons are the time inverse of black hole horizons, and thus the physics of both is the same. The third is that the quantum emission, which is the Hawking process, is completely determined by measurements of the classical parameters of a linear physical system. The experiment conducted in 2010 fulfils all of these requirements, and is thus a true measurement of Hawking radiation.

Keywords

Black holes Hawking radiation Analog gravity  Quantum amplifiers Quantum noise Stimulated emission 

Notes

Acknowledgments

I would like to thank NSER of Canada, CIfAR, and the Templeton Foundation for support of this research. I would also like to thank the Perimenter Institute and through them also the taxpayers of Ontario and Canada through their governments who fund it for hosting and supporting me during part of the time this research was carried out.

References

  1. 1.
    Hawking, S.W.: Black hole explosions. Nature 248, 30 (1974)ADSCrossRefGoogle Scholar
  2. 2.
    Hawking, S.W.: Particle creation by black holes. Commun. Math. Phys. 43, 199 (1975)ADSCrossRefMathSciNetGoogle Scholar
  3. 3.
    Gordon, W.: Zur Lichtfortpflanzung nach der Relativittstheorie. Ann. Phys. (Leipzig) 72, 421–456 (1923)ADSCrossRefzbMATHGoogle Scholar
  4. 4.
    Unruh, W.G.: Experimental black-hole evaporation. Phys. Rev. Lett. 46, 1351 (1981)ADSCrossRefGoogle Scholar
  5. 5.
    The equation with a varying velocity of sound, c was derived in Visser, M.: Acoustic black holes: horizons, ergospheres and Hawking radiation. Class. Quantum Grav. 15 1767 (1998). Google Scholar
  6. 6.
    Unruh, W.G.: Sonic analogue of black holes and the effects of high frequencies on black hole evaporation. D51 2827 (1994). arXiv:gr-qc/9409008
  7. 7.
    Jacobson, T.A.: Black-hole evaporation and ultrashort distances. Phys. Rev. D44, 1731 (1991)ADSGoogle Scholar
  8. 8.
    Corley, S., Jacobson, T.A.: Hawking spectrum and high frequency dispersion. Phys. Rev. D 54, 1568 (1996). arXiv:hep-th/9601073
  9. 9.
    Carlos Barceló, Stefano Liberati, Matt Visser: Analog gravity, Living Rev. Relativity 14, 3 (2011). http://www.livingreviews.org/lrr-2011-3
  10. 10.
    Schützhold, R., Unruh, W.G.: Gravity wave analogues of black holes. Phys. Rev. D66, 044019 (2002)ADSGoogle Scholar
  11. 11.
    For a more extensive discussion, including its application to black hole evaporation, see Unruh, W.G.: Quantum noise in amplifiers and Hawking/dumb-hole radiation as amplifier noise. In: Cardoso, V.M.S., Crispino, L.C.B. , Liberati, S., Olieira, E.S., Visser, M., Livra da Física (Sao Paulo) (eds.) Analog Spacetimes. The first 30 Years (2014) and arXiv:1107.2669.
  12. 12.
    Weinfurtner, S., Tedford, E.W., Penrice, M.C.J., Unruh, W.G., Lawrence, G.A.: Measurement of stimulated Hawking emission in an analogue system. Phys. Rev. Lett. 106, 021302 (2011)ADSCrossRefGoogle Scholar
  13. 13.
    Schützhold, R., Unruh, W.G.: Hawking radiation in an electromagnetic waveguide. Phys. Rev. Lett. 95, 031301 (2005)ADSCrossRefGoogle Scholar
  14. 14.
    Philbin, T.G., Kuklewicz, C., Robertson, S., Hill, S., King, F., Leonhardt, U.: Fibre-optical analogue of the event horizon. Science 319, 1367–1370 (2008)ADSCrossRefGoogle Scholar
  15. 15.
    Belgiorno, F., Cacciatori, S.L., Clerici, M., Gorini, V., Ortenzi, G., Rizzi, L., Rubino, E., Sala, V.G., Faccio, D.: Hawking radiation from ultrashort laser pulse filaments. Phys. Rev. Lett. 105, 203901 (2010)ADSCrossRefGoogle Scholar
  16. 16.
    Schützhold, R. Unruh, W.: Comment on Hawking radiation from ultrashort laser pulse filaments. Phys. Rev. Lett. 107 149401 (2011). The experiments are close but have not quite yet achieved the observation of Hawking radiation.Google Scholar
  17. 17.
    See also papers in analogue gravity phenomenologyanalogue spacetimes and horizons, from theory to experiment. In: Faccio, D., Belgiorno, F., Cacciatori, S., Gorini, V., Liberati, S., Moschella, U. (eds.) Lecture Note in Physics vol 870 (Springer, Berlin) (2013).Google Scholar

Copyright information

© The Author(s) 2014

Authors and Affiliations

  1. 1.Department of Physics, CIAR Cosmology and Gravity ProgramUniversity of British ColumbiaVancouverCanada

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