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

Authors:	Anirudh Pradhan Purnima Pandey

Institution:	(1) Department of Mathematics, Hindu Post-graduate College, Zamania, 232 331 Ghazipur, U.P., India

Abstract:	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 Λ 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.

Keywords:	Cosmology Bianchi type I universe Viscous fluid models Variable cosmological constant
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