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.
The simplest case is the shear diffusion channel, schematically denoted with δT 0⊥, where⊥ is one of the transverse components to our chosen axis aligned with the wave vector k
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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.