The paper derives closed-form mass-dependent transport coefficients for massive RTA gases and proposes that the discontinuity across the correlator cut defines an effective lightcone velocity.
This does not induce any change in the macroscopic variables ( δT , δui), so there is no need to solve the matching conditions
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Relaxation for massive particles: transport and causality
The paper derives closed-form mass-dependent transport coefficients for massive RTA gases and proposes that the discontinuity across the correlator cut defines an effective lightcone velocity.