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Viscous Fluid Cosmological Models in a Bianchi Type I Universe

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Abstract

Exact solutions of the gravitational field equations for a Bianchi type I anisotropic space-time, filled with a viscous cosmological fluid obeying an equation of state of the form p = γ ρ, 0 ≤ γ ≤ 1, are obtained. We investigate both the viscous Zeldovich (γ = 1) and γ < 1 fluid cases, with constant and time varying (proportional to the mean Hubble factor) shear and bulk viscosity coefficients. It is shown that independently of the matter content, the equation of state and the time dependence of the shear and bulk viscosity coefficients, a viscous Bianchi type I universe experiences a transition to an inflationary era. Due to dissipative processes, the mean anisotropy and the shear of the Bianchi type I universe tend very rapidly to zero.

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Authors and Affiliations

  1. Physics Department, University of Hong Kong, Pokfulam, Hong Kong

    M.K. Mak & P.C.W. Fung

  2. Oncological Institute, 3400, Cluj-Napoca, Romania

    T. Harko

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  1. M.K. Mak
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  2. T. Harko
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  3. P.C.W. Fung
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Mak, M., Harko, T. & Fung, P. Viscous Fluid Cosmological Models in a Bianchi Type I Universe. Astrophysics and Space Science 249, 43–71 (1997). https://doi.org/10.1023/A:1000486904994

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