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.
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cond-mat.quant-gas 2years
2026 2verdicts
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Linearized time-dependent BCS theory implemented via the fluctuation-dissipation theorem is the minimal mean-field framework for pair distribution functions in a homogeneous unpolarized superfluid Fermi gas, capturing phonon effects and short-distance corrections missed by static BCS.
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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.
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Pair distribution functions of a superfluid spin-1/2 Fermi gas with contact interactions in the linearized time-dependent BCS theory
Linearized time-dependent BCS theory implemented via the fluctuation-dissipation theorem is the minimal mean-field framework for pair distribution functions in a homogeneous unpolarized superfluid Fermi gas, capturing phonon effects and short-distance corrections missed by static BCS.