statistical behaviours with the way that we expect a future theory of quantum gravity to behave (such as Hawking radiation), these metrics have sometimes been studied in the hope that they might shed light on the statistical mechanics of actual black holes. Some people have suggested that analog models are more than just an analogy and that the actual gravity that we observe is actually an analog theory. But in order for this to hold, since a generic analog model depends upon both the acoustic metric and the underlying background geometry, the low energy large wavelength limit of the theory has to decouple from the background geometry. See also Acoustics Analog models of gravity Gravastar Hawking radiation Quantum gravity Superfluid vacuum theory References Considers information leakage through a transsonic horizon as an "analogue" of Hawking radiation in black hole problems. Indirect radiation effects in the physics of acoustic horizon explored as a case of Hawking radiation. Huge review article of "toy models" of gravitation, 2005, currently on v2, 152 pages, 435 references, alphabetical by author. External links Acoustic black holes on arxiv.org Acoustics Quantum gravity