Abstract
We prove that the natural thermodynamic restrictions on the constitutive equations in relativistic magnetohydrodynamics (stability of equilibrium state) are necessary and sufficient to guarantee that the normal and the radial velocity of the wave front of disturbances and the shock velocity do not exceed the light speed.
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Boillat, G., Ruggeri, T. Wave and shock velocities in relativistic magnetohydrodynamics compared with the speed of light. Continuum Mech. Thermodyn 1, 47–52 (1989). https://doi.org/10.1007/BF01125885
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DOI: https://doi.org/10.1007/BF01125885