Five-phonon collisions drive the phonon gas from partial equilibrium (nonzero chemical potential) to full thermochemical equilibrium, with fugacity rising as t to the 4/5 at early times and exponentially at late times.
Étalement de la phase et cohérence temporelle d’un gaz de fermions condensé par paires à basse température
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Phonon number relaxation in a 3D superfluid with a concave acoustic branch
Five-phonon collisions drive the phonon gas from partial equilibrium (nonzero chemical potential) to full thermochemical equilibrium, with fugacity rising as t to the 4/5 at early times and exponentially at late times.