Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable Cosmological Constant

Details Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable Cosmological Constant Some Bianchi Type I Viscous Fluid Cosmological Models with a Variable Cosmological Constant

2004-07-29

arxiv.org/abs/gr-qc/0407112v1

Astrophys.Space Sci. 301 (2006) 127-134

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages

Scientific paper

Some Bianchi type I viscous fluid cosmological models with a variable cosmological constant are investigated in which the expansion is considered only in two direction i.e. one of the Hubble parameter $(H_{1} = \frac{A_{4}}{A})$ is zero. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density whereas the coefficient of shear viscosity is considered as constant in first case whereas in other case it is taken as proportional to scale of expansion in the model. The cosmological constant $\Lambda$ is found to be positive and is a decreasing function of time which is supported by results from recent supernovae Ia observations. Some physical and geometric properties of the models are also discussed.

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