Abstract
Bianchi type I cosmological models are studied that contain a nonbarotropic relativistic Boltzmann gas. The effect of a cosmological constant is considered too. In the limit of small temperatures the general solution of the Einstein gravitational field equations can be expressed in an exact closed parametrical form. At final stages, depending on the presence or absence of the cosmological constant, cosmologies are driven to an isotropic inflationary de Sitter Universe or to an isotropic Friedmann era.
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Harko, T., Mak, M. Exact Nonbarotropic Bianchi Type I Universe. Astrophysics and Space Science 253, 325–335 (1997). https://doi.org/10.1023/A:1000654019816
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DOI: https://doi.org/10.1023/A:1000654019816