Abstract
The derivation of the “baroenergetic” equation of state is reconsidered in rather a general form following Bernoulli’s kinetic approach but with Lorentz energy-momentum dependence. It is shown that uniform versions of the equation of state generally used in cosmology are valid only in extreme limits: an ultrarelativistic photon gas (electromagnetic radiation) and a nonrelativistic gas of massive particles. Possible ways of generalization of these results are pointed out and briefly discussed.
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Rudoy, Y.G., Kalmykov, A.V. Equation of state for cosmological fluids: Direct dynamical derivation. Gravit. Cosmol. 22, 358–362 (2016). https://doi.org/10.1134/S0202289316040149
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DOI: https://doi.org/10.1134/S0202289316040149