Covariant Thermodynamics and ``Realistic'' Friedmann Model

Details Covariant Thermodynamics and ``Realistic'' Friedmann Model Covariant Thermodynamics and ``Realistic'' Friedmann Model

1995-08-24

arxiv.org/abs/hep-th/9508119v1

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

We discuss a cosmological Friedmann model modified by inclusion of off-shell matter which has an equation of state $p,\rho \propto T^5,$ $p=1/4\rho .$ Such matter is shown to have energy density comparable with that of non-interacting radiation at temperatures of the order of the Hagedorn temperature, $\sim 10^{12}$ K, indicating the possibility of a phase transition. It is argued that the $T^5$-phase, or an admixture, lies below the high-temperature $T^4$-phase.

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