We investigate the evolution of different measures of “Gravitational Entropy” in Bianchi type I and Lemâitre-Tolman universe models. A new quantity behaving in accordance with the second law of thermodynamics is introduced. We then go on and investigate whether a quantum calculation of initial conditions for the universe based upon the Wheeler-DeWitt equation supports Penrose’s Weyl Curvature C...

In this study, the behavior of magnetized strange quark matter (MSQM) distribution in Lyra theory was investigated for homogeneous anisotropic Bianchi III, locally rotationally symmetric (LRS) I, and Kantowski-Sachs universe models. We have used equations state, anisotropy, linearly varying deceleration parameters to obtain exact solutions field theory. When switching from model isotropic model...

The propagation of classical gravitational waves in Bianchi Type-I universes is studied. We find that gravitational waves in Bianchi Type-I universes are not equivalent to two minimally coupled massless scalar fields as it is for the Robertson-Walker universe. Due to its tensorial nature, the gravitational wave is much more sensitive to the anisotropy of the spacetime than the scalar field is a...

Using an approach of modified Euler-Lagrange field equations obtained from an invariant action under infinitesimal modified general coordinates, local Lorentz and U∗(1) gauge transformations together with the corresponding Seiberg-Witten maps of the dynamical fields, a generalized Dirac equation in the presence of a constant electric field and a noncommutative cosmological anisotropic Bianchi I...

The spatially homogeneous and anisotropic LRS Bianchi type-V Universe filled with variable modified Chaplygin gas in the framework of Brans-Dicke [1] scalar-tensor theory of gravitation has been studied. To obtain a determinate solution of the field equations we have used the condition that scalar field (φ) is a function of average scale factor. Some physical and kinematical properties of the m...

Einstein’s field equations with variable gravitational and cosmological constants are considered in the presence of bulk viscous fluid for the totally anisotropic Bianchi type II space-time in such a way as to preserve the energy momentum tensor. We have presented solutions of field equations which represent expanding, shearing and non-rotating cosmological models of the universe. The physical ...

The Bianchi Type V Universe composed by diffuse matter is studied. We examine its anisotropic behaviour as well as the distortion it would cause to CMBR. Next the parameter region allowed by the present cosmological constraints is given. The gauge dependency of the temperature pattern, induced by the anisotropies, is excibited. Pacs numbers: 04.20.Jb , 98.80.Cq Typeset using REVTEX ∗E-mail addr...

The first stage of inflation for the Bianchi type IX metric is considered case near potential maximum. rotation dark energy evolution investigated, where an anisotropic liquid. dependence scale factor on time coincides with a similar in Friedman cosmology at all stages consideration solution. There will be accelerated expansion universe later time.

An anisotropic Bianchi type-III cosmological model is investigated in the presence of a bulk viscous fluid within the framework of Lyra geometry with time-dependent displacement vector. It is shown that the field equations are solvable for any arbitrary function of a scale factor. To get the deterministic model of the universe, we have assumed that (i) a simple power-law form of a scale factor ...