Acoustic analogue of a black hole in which sound plays the role of light
A sonic black hole, sometimes called a dumb hole or acoustic black hole, is a phenomenon in which phonons (sound perturbations) are unable to escape from a region of a fluid that is flowing more quickly than the local speed of sound. They are called sonic, or acoustic, black holes because these trapped phonons are analogous to light in astrophysical (gravitational) black holes. Physicists are interested in them because they have many properties similar to astrophysical black holes and, in particular, emit a phononic version of Hawking radiation.[1][2] This Hawking radiation can be spontaneously created by quantum vacuum fluctuations, in close analogy with Hawking radiation from a real black hole. On the other hand, the Hawking radiation can be stimulated in a classical process. The boundary of a sonic black hole, at which the flow speed changes from being greater than the speed of sound to less than the speed of sound, is called the event horizon.
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^Steinhauer, Jeff (2014). "Observation of self-amplifying Hawking radiation in an analogue black-hole laser". Nature Physics. 10 (11): 864–869. arXiv:1409.6550. Bibcode:2014NatPh..10..864S. doi:10.1038/nphys3104. S2CID 26867033.
A sonicblackhole, sometimes called a dumb hole or acoustic blackhole, is a phenomenon in which phonons (sound perturbations) are unable to escape from...
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