We study the behaviour and evolution of cosmological field equations in an homogeneous anisotropic spacetime with two scalar fields coupled kinetic term. Specifically, energy for Lagrangian is that Chiral model defines a two-dimensional maximally symmetric space negative curvature. For background we assume locally rotational which describes Bianchi I, III Kantowski–Sachs spaces. work on H -norm...

Nonsingular Bianchi type I solutions are found from the effective action with a superstringmotivated Gauss-Bonnet term. These anisotropic nonsingular solutions evolve from the asymptotic Minkowski region, subsequently super-inflate, and then smoothly continue either to Kasner-type (expanding in two directions and shrinking in one direction) or to Friedmann-type (expanding in all directions) sol...

Making use of the $1 + 3$ covariant formalism, we show explicitly effect that nonmetricity has on dynamics universe. Then, using Dynamical System Approach, analyze evolution Bianchi type-I cosmologies within framework $f(\mathcal{Q})$ gravity. We consider several models function $f(\mathcal{Q})$, each them manifesting isotropic eras universe, whether transitional or not. In one case, in additio...

This study discusses f(R,T) theory, one of the alternative theories. It then studies magnetized strange quark matter in universe model Bianchi V I0, homogeneous and anisotropic. Afterwards, it has determined whether energy conditions are provided by using deceleration parameter while obtaining solutions. Moreover, evolution cosmic is examined with help graphics tables.

In this study, we have demonstrated the expansion history of an axially symmetric Bianchi type-I model universe. Our as now presents accelerating universe, which had been in decelerating phase past. Roles two crucial Hubble~$H(z)$ and deceleration~$q(z)$ parameters are examined. The energy universe estimated with help latest observational Hubble data (46-data points) Pantheon (the compilation S...

We present observational constraints on the coupling between dark components of anisotropic Bianchi type I universe. assume interaction matter and energy, split continuity equation with inclusion term ? in two scenarios: (i) when is constant (ii) it a function redshift (z). utilize Metropolis–Hastings algorithm to perform Monte Carlo Markov Chain (MCMC) analyses models by using Hubble data from...

We present a general study of the dynamical properties of Anisotropic Bianchi Universes in the context of Einstein General Relativity. Integrability results using Kovalevskaya exponents are reported and connected to general knowledge about Bianchi dynamics. Finally, dynamics toward singularity in Bianchi type viii and ix universes are showed to be equivalent in some precise sence. 1 Homogeneous...

In the context of brane cosmology, a scenario where our universe is a 3 + 1dimensional surface (the “brane”) embedded in a five-dimensional spacetime (the “bulk”), we study geometries for which the brane is anisotropic — more specifically Bianchi I — though still homogeneous. We first obtain explicit vacuum bulk solutions with anisotropic three-dimensional spatial slices. The bulk is assumed to...