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arXiv · hep-ph/9609466

Phonons as Goldstone Bosons

H. Leutwyler
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Abstract

The implications of the hidden, spontaneously broken symmetry for the properties of the sound waves of a solid are analyzed. Although the discussion does not go beyond standard wisdom, it presents some of the known results from a different perspective. In particular, I argue that, as a consequence of the hidden symmetry, the equations of motion for a sound wave necessarily contain nonlinear terms, describing phonon-phonon scattering and emphasize the analogy with the low energy theorems for pion-pion scattering.

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H. Leutwyler. 1996-09-25. Phonons as Goldstone Bosons. https://arxiv.org/abs/hep-ph/9609466

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