For a massive Maxwell-Boltzmann gas in the relaxation-time approximation, finite mass removes the propagating sound mode, leaving purely imaginary modes, while shear and diffusion modes stay close to the massless results.
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Kinetic Theory of Quasiparticles, Retarded Correlators and Hydrodynamics
For a massive Maxwell-Boltzmann gas in the relaxation-time approximation, finite mass removes the propagating sound mode, leaving purely imaginary modes, while shear and diffusion modes stay close to the massless results.