Abstract
AbstractThe two widespread methods to derive relativistic fluid dynamics from the Boltzmann equation, the Chapman–Enskog expansion [1] and the 14-moment approximation [2,3,4], both described in the previous chapter, have flaws. In the relativistic case, the Chapman–Enskog expansion leads to equations of fluid dynamics that are acausal and intrinsically unstable [5] and, consequently, it should not be applied to derive the equations of relativistic fluid dynamics from kinetic theory.
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