Bianchi Type I Magnetofluid Cosmological Models With Variable Cosmological Constant Revisited

Abstract

The behaviour of magnetic field in anisotropic Bianchi type I cosmological model for bulk viscous distribution is investigated. The distribution consists of an electrically neutral viscous fluid with an infinite electrical conductivity. It is assumed that the component σ 1 1 of shear tensor σ j i is proportional to expansion (θ) and the coefficient of bulk viscosity is assumed to be a power function of mass density. Some physical and geometrical aspects of the models are also discussed in presence and also in absence of the magnetic field.

Magnetized dark energy and the late time acceleration

“…Here we confine ourselves to model LRS Bianchi-I whose spatial sections are flat but the expansion or contraction rate are direction dependent. For studying the possible effects of anisotropy in the early Universe based on the present day observations many researchers [22,23,24,25,26,27,28] have investigated Bianchi type-I models from different point of view. We notice that, in connection to anisotropic equation of state for dark energy, several works are now available in the literature [29,30,31].…”

Inhomogeneous perfect fluid universe with electromagnetic field

“…Bali and Ali (1996) obtained a magnetized cylindrically symmetric universe with an electrically neutral perfect fluid as the source of matter. Chakrabarty et al (2001), Pandey (2003a, 2003b), Pradhan and Singh (2004), Pradhan et al ( , 2006aPradhan et al ( , 2006b have investigated magnetized viscous fluid cosmological models in various contexts.…”

Bianchi Type-III String Cosmological Models with Time Dependent Bulk Viscosity

“…Put more precisely, redshift studies place the limit σ H ≤ 0.30 on the ratio of shear, σ, to Hubble constant H in the neighbourhood of our Galaxy. Following Bali and Jain [41] and Pradhan et al [42,43], we assume that the expansion (θ) in the model is proportional to the shear (σ), which is physically plausible condition. This condition leads to…”