Exact solutions connecting radiation and matter eras using imperfect fluids

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmology: Theory

Scientific paper

Starting from a simple Ansatz for the equation of state, different solutions connecting the radiation and matter eras of a perfect fluid-filled universe and a universe procesing bulk dissipative stress are derived, as is the temperature evolution. The energy conditions are also analysed. No interchange of energy between radiation and matter is allowed.

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