Abstract
In this paper, we suggest that a toy model of our universe is based on FRW bulk viscous cosmology in presence of modified Chaplygin gas. We obtain modified Friedman equations due to bulk viscosity and Chaplygin gas and calculate time-dependent energy density for the special case of flat space.
Highlights
It is found that our universe expands with acceleration [1,2,3,4,5]
Chaplygin gas is used as an exotic type of fluid, which is based on the recent observational fact that the equation of state parameter for dark energy can be less than −1
The presence of viscosity in the fluid introduces many interesting pictures in the dynamics of homogeneous cosmological models, which is used to study the evolution of universe
Summary
It is found that our universe expands with acceleration [1,2,3,4,5]. The accelerating expansion of the universe may be explained in context of the dark energy [6]. The study of the cosmological constant is one of the important subjects in the theoretical and experimental physics [7,8,9,10]. We know that the viscosity plays an important role in the cosmology [20] In another word, the presence of viscosity in the fluid introduces many interesting pictures in the dynamics of homogeneous cosmological models, which is used to study the evolution of universe. [23] the exact solutions of the field equations for a five-dimensional cosmological model with variable bulk viscosity were obtained. The isotropic homogeneous spatially flat cosmological model with bulk viscous fluid was constructed in Ref. The bulk viscous cosmological models with constant bulk viscosity coefficient were constructed in Ref. We consider both bulk viscous effect and Chaplygin gas in FRW cosmology in flat space
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