Viscous inflationary universe models

Details Viscous inflationary universe models Viscous inflationary universe models

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.173..191g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 173, no. 2, Nov. 1990, p. 191-225.

Astronomy and Astrophysics

Astrophysics

109

Astronomical Models, Neutrinos, Universe, Viscous Fluids, Anisotropic Media, Background Radiation, Energy Distribution, Vacuum

Scientific paper

The research on viscous cosmological models is reviewed. Inflationary cosmological models of Bianchi type-I with shear, bulk, and nonlinear viscosity are studied. The inflation field energy is represented by a two-component cosmic fluid consisting of a vacuum fluid and a Zel'dovich fluid. It is shown that there exist models in which the viscous Zel'dovich fluid removes the initial singularity of the corresponding viscosity free models. The mean expansion of a Zel'dovich dominated universe is found to be independent of shear viscosity and anisotropy. Bulk viscosity and shear viscosity cause exponential decay of anisotropy, while nonlinear viscosity causes power-law decay of anisotropy.

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