Fourth sound of holographic superfluids

Details Fourth sound of holographic superfluids Fourth sound of holographic superfluids

2009-03-09

arxiv.org/abs/0903.1353v2

JHEP 0907:070,2009

Physics

High Energy Physics

High Energy Physics - Theory

20 pages, 6 figures; removed a discussion on a variant of fourth sound

Scientific paper

10.1088/1126-6708/2009/07/070

We compute fourth sound for superfluids dual to a charged scalar and a gauge field in an AdS_4 background. For holographic superfluids with condensates that have a large scaling dimension (greater than approximately two), we find that fourth sound approaches first sound at low temperatures. For condensates that a have a small scaling dimension it exhibits non-conformal behavior at low temperatures which may be tied to the non-conformal behavior of the order parameter of the superfluid. We show that by introducing an appropriate scalar potential, conformal invariance can be enforced at low temperatures.

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