Abstract
In this paper, we have constructed the cosmological model of the universe in a two-fluid environment with a newly developed mathematical formalism. In order to construct the model, Binachi type V (BV) space time is considered with a time varying deceleration parameter. Both the fluids, the viscous fluid and the dark energy (DE) fluid have shown their dominance respectively in early time and late time of the cosmic evolution. The scale factor that simulates the cosmic transition based on the value of the bulk viscous coefficient. Within the developed formalism, a general form of the skewness parameters is also obtained as a functional form of the scale factor. The physical parameter of the model such as equation of state (EoS) parameter is also derived and analysed. The state finder diagnostic pair is also obtained to understand the geometrical nature of the model.
Highlights
This cosmological constant is not well defined with respect to the fine-tuning and cosmic coincidence puzzles parameter (EoS) ωDE = pDE ρDE = −1 [13,14].On larger scales, our universe is isotropic and homogeneous
We have investigated the anisotropic behaviour of the cosmological model constructed in a two fluid situations: the usual bulk viscous fluid and dark energy (DE) fluid
The scale factor considered here is the hybrid scale factor which can be attributed to power law cosmology and de Sitter universe for appropriate value of the constant
Summary
This cosmological constant is not well defined with respect to the fine-tuning and cosmic coincidence puzzles [12]. At low multi-poles the CDM cosmology shows a poor fit to the CMB temperature power spectrum [9,10] This indicates that the isotropy and homogeneity were not the essential features of the early universe. The recent Planck data results motivate us to construct and analysed the cosmological models with anisotropic geometry to get a deeper understanding on the the evolution of the universe. In this regard, BV space–time is of fundamental importance since it provides the requisite framework.
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