I am currently working my way through Kitel's Solid State Physics book. When discussing the consequences of the harmonic assumption (quadratic degree of freedom for interatomic lattice interactions), he states that(adsbygoogle = window.adsbygoogle || []).push({});

1) the lattice waves do not interact

2) a single wave does not change form or decay over time.

Why is that?

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# Harmonic vs Anharmonic Interactions in Lattice

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