Physics – Condensed Matter
Scientific paper
2003-07-20
Phys.Rev. A68 (2003) 053613
Physics
Condensed Matter
18 pages; uses revtex4. V2: Added brief discussion of "Bose-Nova" phenomenon, and appropriate references
Scientific paper
10.1103/PhysRevA.68.053613
Bose-Einstein condensates (BEC) have recently been the subject of considerable study as possible analogue models of general relativity. In particular it was shown that the propagation of phase perturbations in a BEC can, under certain conditions, closely mimic the dynamics of scalar quantum fields in curved spacetimes. In two previous articles [gr-qc/0110036, gr-qc/0305061] we noted that a varying scattering length in the BEC corresponds to a varying speed of light in the ``effective metric''. Recent experiments have indeed achieved a controlled tuning of the scattering length in Rubidium 85. In this article we shall discuss the prospects for the use of this particular experimental effect to test some of the predictions of semiclassical quantum gravity, for instance, particle production in an expanding universe. We stress that these effects are generally much larger than the Hawking radiation expected from causal horizons, and so there are much better chances for their detection in the near future.
Barcelo Carlos
Liberati Stefano
Visser Matt
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