Tilted Bulk Disordered Distribution Cosmological Model

2012 ◽  
Vol 629 ◽  
pp. 635-640
Author(s):  
Anita Bagora ◽  
Rakeshwar Purohit
Keyword(s):  
Heat Conduction ◽  
Cosmological Model ◽  
Viscous Fluid ◽  
Bulk Viscosity ◽  
Linear Relation ◽  
Bianchi Type ◽  
Type I ◽  
Bulk Viscous Fluid ◽  
Tilted Cosmological Model ◽  
Bulk Viscous

Bianchi type I bulk viscous fluid tilted cosmological model filled with disordered radiation and heat conduction is investigated. We assume that (constant), where is the coefficient of bulk viscosity and  is the expansion in the model. Here, we assume a linear relation between shear and expansion i.e. =constant, which leads to A=BC, where A, B, C are metric potentials. The physical and geometrical aspects of the model in the presence and absence of bulk viscosity are also discussed.

scholarly journals Dust Fluid Cosmological Model

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Anita Bagora (Menaria) ◽  
Rakeshwar Purohit
Keyword(s):  
Cosmological Model ◽  
Viscous Fluid ◽  
Physical Properties ◽  
Bulk Viscosity ◽  
Bianchi Type ◽  
Type I ◽  
Bulk Viscous Fluid ◽  
Bulk Viscous ◽  
Dust Fluid ◽  
Hubble Parameters

Bianchi type I tilted bulk viscous fluid cosmological model filled with dust fluid is investigated. We assume that (constant), where is the coefficient of bulk viscosity and is the expansion in the model. It has been assumed that the expansion in the model is only in two directions; that is, one of the components of Hubble parameters is zero. The physical and geometrical aspects of the model in the presence and absence of bulk viscosity are also discussed. Also, we have discussed two special models and their physical properties. From this, we present a particular example based on dust fluid.

Isotropic Cosmological Model in Generalized Scalar Tensor Theory with Bulk Viscosity

1997 ◽  
Vol 06 (01) ◽  
pp. 119-124 ◽  
Author(s):  
N. Banerjee ◽  
Aroonkumar Beesham
Keyword(s):  
Scalar Field ◽  
Cosmological Model ◽  
Viscous Fluid ◽  
Bulk Viscosity ◽  
Conformal Transformation ◽  
Scalar Tensor Theory ◽  
Bulk Viscous Fluid ◽  
Tensor Theory ◽  
Bulk Viscous ◽  
Isotropic Cosmological Model

In this paper both exponential and power law solutions for the flat Robertson–Walker cosmological model have been derived in a generalized Brans–Dicke theory, where the parameter ω is a function of the scalar field, along with a bulk viscous fluid. The solutions are obtained in Dicke's revised units and these are also given in the original atomic units via the conformal transformation prescribed by Dicke.

scholarly journals Anisotropic Bianchi Type-III Bulk Viscous Fluid Universe in Lyra Geometry

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Priyanka Kumari ◽  
M. K. Singh ◽  
Shri Ram
Keyword(s):  
Cosmological Model ◽  
Viscous Fluid ◽  
Bianchi Type ◽  
Lyra Geometry ◽  
Scale Factor ◽  
Field Equations ◽  
Type Iii ◽  
Bulk Viscous Fluid ◽  
Bulk Viscous ◽  
The Universe

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 and (ii) the bulk viscosity coefficient are proportional to the energy density of the matter. The exact solutions of the Einstein’s field equations are obtained which represent an expanding, shearing, and decelerating model of the universe. Some physical and kinematical behaviors of the cosmological model are briefly discussed.

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