Anderson-Witting transport coefficients for flows in general relativity
  The transport coefficients induced by the Anderson-Witting approximation of the collision term in the relativistic Boltzmann equation are derived for close to equilibrium flows in general relativity. Using the tetrad formalism, it is shown that the expression for these coefficients is the same as that obtained on flat space-time, in agreement with the generalized equivalence principle. 
Victor E. Ambrus
astro-ph.HE gr-qc hep-th