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Fourth sound of holographic superfluids

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arxiv 0903.1353 v2 pith:IAQVXNU7 submitted 2009-03-09 hep-th

classification hep-th
keywords soundfourthsuperfluidstemperaturesbehaviorcondensatesdimensionholographic
verification ladder T0 review T1 audit T2 compute T3 formal

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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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  1. Dissipation triggers dynamical two-stream instability

    gr-qc 2019-08 conditional novelty 7.0 of 10

    Dissipation makes the relativistic two-stream instability dynamical exactly at the counterflow velocity where an ideal fluid would only show an energetic instability.

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