Dark Energy Model in Anisotropic Bianchi Type-III Space-Time with Variable EoS Parameter

Abstract

A new dark energy model in anisotropic Bianchi type-III space-time with variable equation of state (EoS) parameter has been investigated in the present paper. To get the deterministic model, we consider that the expansion $\theta$ in the model is proportional to the eigen value ${\sigma }_2^2$ of the shear tensor ${\sigma }_{}^{j}i$. The EoS parameter $\omega$ is found to be time dependent and its existing range for this model is in good agreement with the recent observations of SNe Ia data (Knop et al. 2003) and SNe Ia data with CMBR anisotropy and galaxy clustering statistics (Tegmark et al. 2004). It has been suggested that the dark energy that explains the observed accelerating expansion of the universe may arise due to the contribution to the vacuum energy of the EoS in a time dependent background. Some physical aspects of dark energy model are also discussed.

18 pages, 3 figures

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• Accelerating Bianchi Type-V Cosmology with Perfect Fluid and Heat Flow in Saez-Ballester Theory
• Testing the Cosmic Anisotropy with Supernovae Data: Hemisphere Comparison and Dipole Fitting
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• Anisotropic Dark Energy Bianchi Type III Cosmological Models in Brans Dicke Theory of Gravity
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• Killing and Noether Symmetries of Plane Symmetric Spacetime
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