A note on the analogy between superfluids and cosmology

Details A note on the analogy between superfluids and cosmology A note on the analogy between superfluids and cosmology

2009-10-05

arxiv.org/abs/0910.0790v2

Physics

Condensed Matter

Other Condensed Matter

Accepted for publication in Modern Physics Letters B

Scientific paper

A new analogy between superfluid systems and cosmology is here presented, which relies strongly on the following ingredient: the back-reaction of the vacuum to the quanta of sound waves. We show how the presence of thermal phonons, the excitations above the quantum vacuum for $T> 0$, enable us to deduce an hydrodynamical equation formally similar to the one obtained for a perfect fluid in a Universe obeying the Friedmann-Robertson-Walker metric.

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