The entropy of an acoustic black hole in Bose-Einstein condensates: transverse modes as a cure for divergences

Abstract

We consider the entropy associated to the phonons generated via the Hawking mechanism in a sonic hole in a Bose-Einsten condensate. In a previous paper, we looked at the (1+1)-dimensional case both in the hydrodynamic limit and in the case when high-frequency dispersion is taken in account. Here, we extend the analysis, based on the 't Hooft brick wall model, by including transverse excitations. We show that they can cure the infrared divergence that appears in the (1+1)-dimensional case, by acting as an effective mass for the phonons. In the hydrodynamic limit, where high-frequency dispersion is neglected, the ultraviolet divergence remains. On the contrary, in the dispersive case the entropy not only is finite, but it is completely fixed by the geometric parameters of the system.

Version accepted for publication on International Journal of Modern Physics D

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• Quantum-corrected two-dimensional Horava-Lifshitz black hole entropy
• Thermodynamics of acoustic black holes in two dimensions
• Stochastic motion in an expanding noncommutative fluid
• Black hole thermodynamics from decoherence
• Effects of the Quantum Potential on lower dimensional models of analogue gravity