Spatially homogeneous Bianchi type-II, VIII and IX anisotropic, as well as isotropic cosmological models can be obtained in a scalar tensor theory of gravitation proposed by Saez and Ballester (1986) when the source for energy momentum tensor is a bulk viscous fluid containing one-dimensional cosmic strings. All the models obtained and presented here are expanding, non-rotating and accelerating...

Abstract Loop quantum cosmology leads to a difference equation for the wave function of a universe. In the semiclassical limit, small-scale oscillations must be suppressed by choosing parameters of general solutions appropriately. For anisotropic models this is not possible to do numerically by trial and error; instead, it is shown here for the Bianchi I LRS model how this can be done analytica...

In the second self-creation theory of gravitation and in the general theory of relativity, Bianchi type VI0 cosmological model in the presence of viscous fluid is studied. An exact solution of the field equations is given by considering the cosmological model yields a constant decelerations parameter q=constant and the coefficients of the metric are taken as A(t)=[c1t+c<su...

By using Bianchi I type of homogenous and anisotropic background metric having cylindrical symmetry in $x$ direction a local cartesian coordinates system, we solve field equations for non-minimally coupled Einstein-Maxwell gravity. To do so choose long wavelength EM waves where spatial dependence the are negligible at expansion duration. Motivation this work is study directional effects vector ...

In this cosmological model, we have studied the spatially homogeneous and anisotropic Bianchi type axially symmetric model filled with dark matter energy in Brans-Dicke’s [1] theory of gravitation. Here, consider modified holographic Ricci defined by Chen Jing [21] as suitable condition energy. To obtain a solution assumed scale factor used Mishra et al. [43]. We solved field equations Brans-Di...

The minisuperspace model of a Bianchi Type I universe with compact spatial sections is investigated. The classical solutions are brought onto a form were the difference between compact and infinite spatial sections are manifest. One of the features of the compact case is that it has a non-trivial moduli space. The solution space of the compact Bianchi Type I universe is 10 dimensional whereas t...

We investigate cosmologies where the accelerated expansion of the Universe is driven by a field with an anisotropic equation of state. We model such scenarios within the Bianchi I framework, introducing two skewness parameters to quantify the deviation of pressure from isotropy. We study the dynamics of the background expansion in these models. A special case of anisotropic cosmological constan...