Acoustic Energy and Momentum in a Moving Medium

Details Acoustic Energy and Momentum in a Moving Medium Acoustic Energy and Momentum in a Moving Medium

1999-09-21

arxiv.org/abs/cond-mat/9909315v1

Phys.Rev.E62:1341-1350,2000

Physics

Condensed Matter

25 Pages, LateX

Scientific paper

10.1103/PhysRevE.62.1341

By exploiting the mathematical analogy between the propagation of sound in a non-homogeneous potential flow and the propagation of a scalar field in a background gravitational field, various wave ``energy'' and wave ``momentum'' conservation laws are established in a systematic manner. In particular the acoustic energy conservation law due to Blokhintsev appears as the result of the conservation of a mixed co- and contravariant energy-momentum tensor, while the exchange of relative energy between the wave and the mean flow mediated by the radiation stress tensor, first noted by Longuet-Higgins and Stewart in the context of ocean waves, appears as the covariant conservation of the doubly contravariant form of the same energy-momentum tensor.

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