scholarly journals BIANCHI TYPE I MAGNETOFLUID COSMOLOGICAL MODELS WITH VARIABLE COSMOLOGICAL CONSTANT REVISITED

2004 ◽  
Vol 13 (03) ◽  
pp. 503-516 ◽  
Author(s):  
ANIRUDH PRADHAN ◽  
SANJAY KUMAR SINGH
Keyword(s):  
Magnetic Field ◽  
Bianchi Type ◽  
Mass Density ◽  
Type I ◽  
Variable Cosmological Constant ◽  
Bianchi Type I ◽  
Bulk Viscous ◽  
Tensor Formula ◽  
The Magnetic Field ◽  
Shear Tensor

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 [Formula: see text] of shear tensor [Formula: see text] 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.

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.

BIANCHI TYPE I MAGNETIZED DUST FILLED UNIVERSE IN LYRA GEOMETRY

2010 ◽  
Vol 25 (25) ◽  
pp. 4839-4848 ◽  
Author(s):  
RAJ BALI ◽  
NARESH K. CHANDNANI ◽  
JAGDISH PRASAD DHANKA
Keyword(s):  
Magnetic Field ◽  
Bianchi Type ◽  
Deterministic Model ◽  
Lyra Geometry ◽  
Type I ◽  
Astronomical Observations ◽  
Bianchi Type I ◽  
Tensor Formula ◽  
The Universe ◽  
Shear Tensor

Bianchi Type I dust filled universe in the frameworks of Lyra geometry in the presence of magnetic field is investigated. To get the deterministic model of the universe, we have also assumed that the eigenvalue [Formula: see text] of shear tensor [Formula: see text] is proportional to the expansion (θ) in the model. This leads to A = (BC)nwhere A, B and C are metric potentials and n is a constant. The physical and geometrical aspects of the model related with astronomical observations are also discussed.

BULK VISCOUS BIANCHI TYPE I BAROTROPIC FLUID COSMOLOGICAL MODEL WITH VARYING Λ AND FUNCTIONAL RELATION ON HUBBLE PARAMETER IN ROSEN’S BIMETRIC GRAVITY

2021 ◽  
Vol 10 (5) ◽  
pp. 2515-2525
Author(s):  
N.P. Gaikwad ◽  
P.V. Lepse ◽  
B.K. Bishi ◽  
N.K. Ashtankar
Keyword(s):  
Cosmological Model ◽  
Hubble Parameter ◽  
Bianchi Type ◽  
Functional Relation ◽  
Late Time ◽  
Type I ◽  
Bianchi Type I ◽  
Barotropic Fluid ◽  
Bimetric Gravity ◽  
Bulk Viscous

We have deduced that bulk viscous Bianchi type I barotropic fluid cosmological model with varying $\Lambda$ and functional relation on hubble parameter by solving the field equations bimetric theory of gravitation. It is observed that our model has exponentially accelerating expansion at late time starting with decelerating expansion which agreed the observation of Perlmutter (1998), Knop (2003), Tegmark (2004) and Spergel (2006). In the beginning, our model has more than three spatial-dimensions then it switched over to three-dimensional spatial geometry at late epoch of time and it is agreed with Borkar et al. (2013). Other geometrical and physical behavior of the model have been studied.

Homogeneous viscous universes with magnetic field II. Bianchi type I spaces

1987 ◽  
Vol 179 (1) ◽  
pp. 52-75 ◽  
Author(s):  
G.A.Q. Salvati ◽  
E.E. Schelling ◽  
W.A. van Leeuwen
Keyword(s):  
Magnetic Field ◽  
Bianchi Type ◽  
Type I ◽  
Bianchi Type I

Bianchi type-I bulk viscous cosmology with Chaplygin gas in Lyra Geometry

2016 ◽  
Vol 54 (6) ◽  
pp. 895-905 ◽  
Author(s):  
G.P. Singh ◽  
Binaya K. Bishi ◽  
P.K. Sahoo
Keyword(s):  
Bianchi Type ◽  
Lyra Geometry ◽  
Chaplygin Gas ◽  
Type I ◽  
Bianchi Type I ◽  
Viscous Cosmology ◽  
Bulk Viscous
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