Viscous Dark Energy Models with Variable G and Lambda

Abstract

We consider a cosmological model with bulk viscosity ($\eta$) and variable cosmological $(\Lambda \propto {\rho }^{-\alpha },\alpha =const.$) and gravitational ($G$) constants. The model exhibits many interesting cosmological features. Inflation proceeds du to the presence of bulk viscosity and dark energy without requiring the equation of state $p=-\rho$. During the inflationary era the energy density ($\rho$) does not remain constant, as in the de-Sitter type. Moreover, the cosmological and gravitational constants increase exponentially with time, whereas the energy density and viscosity decrease exponentially with time. The rate of mass creation during inflation is found to be very huge suggesting that all matter in the universe was created during inflation.

6 Latex pages

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Cited by in corpus (4)

• An Interacting Two-Fluid Scenario for Dark Energy in FRW Universe
• Statefinder Parameters for Different Dark Energy Models with Variable G Correction in Kaluza-Klein Cosmology
• A study on the dependence of the dimensionless Brans-Dicke parameter on the scalar field and their time dependence
• Statefinder Parameter for Varying G in Three Fluid System