Bulk Viscous LRS Biachi-I Universe with variable $G$ and decaying $\Lambda$

Abstract

The present study deals with spatially homogeneous and totally anisotropic locally rotationally symmetric (LRS) Bianchi type I cosmological model with variable $G$ and $\Lambda$ in presence of imperfect fluid. To get the deterministic model of Universe, we assume that the expansion $(\theta )$ in the model is proportional to shear $(\sigma )$. This condition leads to $A=\ell B^n$, where $A$,\;$B$ are metric potential. The cosmological constant $\Lambda$ is found to be decreasing function of time and it approaches a small positive value at late time which is supported by recent Supernovae Ia (SN Ia) observations. Also it is evident that the distance modulus curve of derived model matches with observations perfectly.

11 pages, 4 figures and 1 table, Accepted for publication in Astrophysics and Space Science

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• An Axially Symmetric Transitioning models with Observational Constraints
• Cosmological constant dominated transit universe from early deceleration to current acceleration phase in Bianchi-V space-time
• Bianchi type-I transit cosmological models with time dependent gravitational and cosmological constants - reexamined
• Noether Symmetries of Some Homogeneous Universe Models in Curvature Corrected Scalar-Tensor Gravity
• Transit universe with time varying $G$ and decaying $\Lambda$
• A new class of holographic dark energy models in LRS Bianchi Type-I
• Nonlinear Spinor Fields in Bianchi type-I spacetime reexamined
• Dynamics of Magnetized Bulk Viscous Strings in Brans-Dicke Gravity
• Dynamics of Potentials in Bianchi Type Scalar-Tensor Cosmology
• The Bulk Viscous String Cosmology in An Anisotropic Universe With Late Time Acceleration
• A Cosmological Model of Thermodynamic Open Universe
• Accelerating Universe with binary mixture of bulk viscous fluid and dark energy