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Analogue models of and for gravity
Matt Visser, Carlos Barcelo, Stefano Liberati
Condensed matter systems, such as acoustics in flowing fluids, light in moving dielectrics, or quasiparticles in a moving superfluid, can be used to mimic aspects of general relati…
Refringence, field theory, and normal modes
C. Barcelo, S. Liberati, Matt Visser
In a previous paper [gr-qc/0104001; Class. Quant. Grav. 18 (2001) 3595-3610] we have shown that the occurrence of curved spacetime ``effective Lorentzian geometries'' is a generic…
Towards the observation of Hawking radiation in Bose--Einstein condensates
Carlos Barcelo, Stefano Liberati, Matt Visser
Acoustic analogues of black holes (dumb holes) are generated when a supersonic fluid flow entrains sound waves and forms a trapped region from which sound cannot escape. The surfac…
Acoustics in Bose--Einstein condensates as an example of Lorentz symmetry breaking
Matt Visser, Carlos Barcelo, Stefano Liberati
To help focus ideas regarding possible routes to the breakdown of Lorentz invariance, it is extremely useful to explore concrete physical models that exhibit similar phenomena. In…
Einstein Gravity as an emergent phenomenon?
Carlos Barcelo, Matt Visser, Stefano Liberati
In this essay we marshal evidence suggesting that Einstein gravity may be an emergent phenomenon, one that is not ``fundamental'' but rather is an almost automatic low-energy long-…