Abstract
Phonon creation inside the horizons of acoustic black holes is investigated using two simple toy models. It is shown that, unlike what occurs in the exterior regions, the spectrum is not thermal. This non-thermality is due to the anomalous scattering that occurs in the interior regions.
Highlights
Among the many spectacular celestial objects that populate our Universe, black holes (BHs) are perhaps the most intriguing
Unlike what occurs in the exterior regions, the spectrum is not thermal
This nonthermality is due to the anomalous scattering that occurs in the interior regions
Summary
Among the many spectacular celestial objects that populate our Universe, black holes (BHs) are perhaps the most intriguing. The sonic surface, where the speed of the flow equals the local speed of sound, plays the role of the horizon This sonic horizon has no causal significance at all: there is nothing to prevent one from directly observing the interior region. The calculations are done in the analog spacetime using quantum field theory in curved space techniques These are the same types of calculations that one would do to explore similar effects in the interior of a real black hole. R and T no longer satisfy the previous unitary relation Instead they satisfy jTj2 − jRj2 1⁄4 1 which implies particle creation since jTj2 ≥ 1.
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