Effective Field Theory of ideal-fluid Hydrodynamics

Details Effective Field Theory of ideal-fluid Hydrodynamics Effective Field Theory of ideal-fluid Hydrodynamics

1996-07-23

arxiv.org/abs/cond-mat/9607164v1

Mod. Phys. Lett. B 10, 999 (1996)

Physics

Condensed Matter

17 pages, REVTeX

Scientific paper

Starting from a standard description of an ideal, isentropic fluid, we derive the effective theory governing a gapless non-relativistic mode---the sound mode. The theory, which is dictated by the requirement of Galilei invariance, entails the entire set of hydrodynamic equations. The gaplessness of the sound mode is explained by identifying it as the Goldstone mode associated with the spontaneous breakdown of Galilei invariance. Differences with a superfluid are pointed out.

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