Astrophysical observations of Hawking radiation may be out of reach, but evidence for the self-amplification of Hawking radiation has now been observed in a sonic analogue of a black hole.
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Modugno, G. A black-hole laser. Nature Phys 10, 793–794 (2014). https://doi.org/10.1038/nphys3141
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DOI: https://doi.org/10.1038/nphys3141
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