Wave speeds in relativistic warm plasmas

A recently obtained warm plasma model is here considered and the speeds of propagation of the discontinuity waves are calculated. These speeds, relative to the fluid, are 0, ±sqrt{7/15}ε ,±sqrt{3/5}ε, ±sqrt{1/3}, where ε is the smallest parameter invariantly related to temperature. Explicit expressions are also shown for the eigenvectors.