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[ref] and [ref] , where the effective field theory formalism for zero temperature superfluids and barotropic normal fluids was developed.","intent_p":1.0,"contests_p":null},{"arxiv_id":"1009.3094","title":"Deconstructing holographic liquids","url":"/paper/1009.3094","section":"Ideal hydrodynamics as a theory of Goldstone bosons","sentence":"Thus, the action can be written as [equation] If we set the metric to $G_ab=δ_ab$, $v_a=0$, then the action is the same as that of Ref. 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