Acoustic metrics and quantum gravity

              Since acoustic metrics share some 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.