Proving the Lorentz Invariance of the Entropy and the Covariance of Thermodynamics

Abstract The standard argument for the Lorentz invariance of thermodynamic entropy in equilibrium is based on assumption that it possible to perform an adiabatic transformation whose only outcome accelerate a macroscopic body, keeping its rest mass unchanged. validity this constitutes very foundation relativistic thermodynamics and needs be tested greater detail. We show that, indeed, such always possible, at least principle. two assumptions invoked proof are there one inertial reference frame which second law valid microscopic theory describing internal dynamics body field theory, with invariant Lagrangian density. makes no connection between probabilities both within classical quantum physics. To avoid any risk circular reasoning, we do not postulate laws same every frame, but obtain fact as direct consequence entropy.