A nonequilibrium universe of stars and radiation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Big Bang Cosmology, Relativistic Plasmas, Universe, Black Body Radiation, Kinetic Theory, Macroscopic Equations, Nonequilibrium Thermodynamics, Plasma-Electromagnetic Interaction, Stars, Two Fluid Models

Scientific paper

A model for a relativistic gas of macroscopic objects and black-body radiation is constructed using kinetic theory and the assumptions that the macroscopic objects form a perfect fluid and scatter the radiation isotropically in their rest frame. The model is applied to the Robertson-Walker metric and the nonrelativistic and ultra-relativistic limits are given. Equilibrium occurs in the limit that the temperature of the gas of macroscopic objects approaches zero.

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