Unified description of early universe with bulk viscosity.

Details Unified description of early universe with bulk viscosity. Unified description of early universe with bulk viscosity.

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ijtp...37.1141r&link_type=abstract

International Journal of Theoretical Physics, Vol. 37, No. 3, p. 1141 - 1149

Physics

2

Early Universe: Robertson-Walker Metric

Scientific paper

A class of homogeneous and isotropic zero-curvature Robertson-Walker models with bulk viscosity is studied. Solutions are obtained with the parameter gamma of the "gamma-law" equation of state p = (γ-1)ρ in which the adiabatic parameter γ varies continuously as the universe expands. A unified description of the early evolution of the universe is presented with constant bulk viscosity and time-dependent bulk viscosity in which an inflationary period is followed by a radiation-dominated phase. The authors also establish the time dependence of the cosmological constant in terms of varying γ index. Some physical properties of the models are also discussed.

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