scholarly journals Bianchi Type I Cosmological Models with Perfect Fluid and Magnetic Field

1985 ◽  
Vol 38 (2) ◽  
pp. 239 ◽  
Author(s):  
SR Roy ◽  
S Narain ◽  
JP Singh
Keyword(s):  
Magnetic Field ◽  
Perfect Fluid ◽  
Bianchi Type ◽  
Unit Vector ◽  
Cosmological Models ◽  
Type I ◽  
Constant Ratio ◽  
Bianchi Type I ◽  
Expansion Scalar

We investigate Bianchi type I cosmological models containing a perfect fluid and with an incident magnetic field directed along the x axis. The solutions obtained represent an expansion scalar B bearing a constant ratio to the anisotropy in the direction of a space-like unit vector At.

scholarly journals LRS BIANCHI TYPE-I COSMOLOGICAL MODELS IN BARBER'S SECOND SELF CREATION THEORY

2002 ◽  
Vol 11 (08) ◽  
pp. 1195-1207 ◽  
Author(s):  
ANIRUDH PRADHAN ◽  
ANIL KUMAR VISHWAKARMA
Keyword(s):  
Physical Properties ◽  
Exact Solutions ◽  
Perfect Fluid ◽  
Deceleration Parameter ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Type I ◽  
Fluid Source ◽  
Bianchi Type I ◽  
Radiation Universe

Barber's second self creation theory with perfect fluid source for an LRS Bianchi type-I metric is considered using deceleration parameter to be constant where the metric potentials are taken as functions of x and t. In particular, some exact solutions have also been obtained for the vacuum universe, Zel'dovich universe and radiation universe. Some physical properties of the models are also discussed.

scholarly journals BIANCHI TYPE I ANISOTROPIC MAGNETIZED COSMOLOGICAL MODELS WITH VARYING Λ

2003 ◽  
Vol 12 (07) ◽  
pp. 1299-1314 ◽  
Author(s):  
ANIRUDH PRADHAN ◽  
OM PRAKASH PANDEY
Keyword(s):  
Magnetic Field ◽  
Viscous Fluid ◽  
Bianchi Type ◽  
Mass Density ◽  
Cosmological Models ◽  
Type I ◽  
Bianchi Type I ◽  
Bulk Viscous Fluid ◽  
Varying Λ ◽  
The Magnetic Field

Bianchi type I magnetized cosmological models in the presence of a bulk viscous fluid are investigated. The source of the magnetic field is due to an electric current produced along the x-axis. The distribution consists of an electrically neutral viscous fluid with an infinite electrical conductivity. The coefficient of bulk viscosity is assumed to be a power function of mass density. The cosmological constant Λ is found to be positive and is a decreasing function of time which is supported by results from recent supernovae observations. The behaviour of the models in the presence and the absence of magnetic field are also discussed.

LRS Bianchi type I magnetized cosmological model with perfect fluid and with quintessence, Chaplygin gas dark energy in bimetric theory of gravitation

2016 ◽  
Vol 26 (07) ◽  
pp. 1750061 ◽  
Author(s):  
M. S. Borkar ◽  
P. V. Gayakwad
Keyword(s):  
Magnetic Field ◽  
Dark Energy ◽  
Perfect Fluid ◽  
Bianchi Type ◽  
Chaplygin Gas ◽  
Bimetric Theory ◽  
Type I ◽  
Bianchi Type I ◽  
Theory Of Gravitation ◽  
Quintessence Model

We studied the LRS Bianchi type I cosmological models with perfect fluid, quintessence and standard Chaplygin gas dark energy in the presence as well as in the absence of magnetic field [Formula: see text], in bimetric theory of gravitation. It is realized that the magnetic field controlled the whole behavior of the models. In the absence of magnetic field, these models exists and the model never exists in the presence of magnetic field. The geometry of quintessence model for [Formula: see text] and standard Chaplygin gas model coincide and their physical behavior are same in the absence of magnetic field. Some geometrical and physical properties of each of the model are explored. The model have also been studied in regard with the singularities and it is pointed out that the model is singular in the presence of magnetic field and nonsingular in the absence of magnetic field.

Conformal symmetric Bianchi type-I cosmologies in f(R) gravity

2018 ◽  
Vol 33 (23) ◽  
pp. 1850134 ◽  
Author(s):  
Dog̃ukan Taṣer ◽  
Melis Ulu Dog̃ru
Keyword(s):  
Perfect Fluid ◽  
Bianchi Type ◽  
Conformal Symmetry ◽  
Cosmological Models ◽  
Value Of Time ◽  
Type I ◽  
Field Equations ◽  
Bianchi Type I ◽  
Symmetry Properties ◽  
Bianchi Type I Universe

In this study, we investigate the Bianchi type-I cosmologies with string cloud attached to perfect fluid in f(R) gravity. The field equations and their exact solutions for Bianchi type-I cosmologies with string cloud attached to a perfect fluid are found by using the conformal symmetry properties. The obtained solutions under the varied selection of arbitrary constants indicate three cosmological models. Isotropy conditions for obtained cosmological models are investigated for large value of time. Whether or not the string cloud in conformal symmetric Bianchi type-I universe supports the isotropy condition for the large value of time has been investigated. Also, we examine the contracting and decelerating features of the obtained solutions by using Raychaudhuri equation. Finally, geometrical and physical results of the solutions are discussed.

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