scholarly journals A New Class of Brans - Dicke Cosmological Models with Causal Viscous Fluid

1997 ◽  
Vol 50 (5) ◽  
pp. 903 ◽  
Author(s):  
G. P. Singh ◽  
A S. G. Ghosh ◽  
Aroonkumar Beesham
Keyword(s):  
Viscous Fluid ◽  
Nonequilibrium Thermodynamics ◽  
Cosmological Solution ◽  
Cosmological Models ◽  
Fluid Source ◽  
New Class ◽  
Bulk Viscous Fluid ◽  
Bulk Viscous ◽  
Friedmann Robertson Walker

The behaviour of solutions to the Brans–Dicke equations of Friedmann–Robertson–Walker models with bulk viscous fluid source described by full (i.e. non-truncated) causal nonequilibrium thermodynamics is investigated. A new class of cosmological solution is obtained for all spatial sections (k = 0, ± 1).

COSMOLOGICAL MODELS IN GENERALIZED SCALAR–TENSOR THEORY WITH CAUSAL VISCOUS FLUID

1998 ◽  
Vol 07 (06) ◽  
pp. 849-856
Author(s):  
G. P. SINGH ◽  
S. G. GHOSH ◽  
AROONKUMAR BEESHAM
Keyword(s):  
Scalar Field ◽  
Viscous Fluid ◽  
Nonequilibrium Thermodynamics ◽  
Coupling Parameter ◽  
Scalar Tensor Theory ◽  
Bulk Viscous Fluid ◽  
Tensor Theory ◽  
Bulk Viscous ◽  
Friedmann Robertson Walker ◽  
Causal Thermodynamics

We consider generalized Brans–Dicke theory in which the coupling parameter is not constant but a function of the scalar field. Friedmann–Robertson–Walker models with bulk viscous fluid source described by full (i.e., nontruncated) causal nonequilibrium thermodynamics are analyzed. Exact solutions for the flat case have been obtained. Our results are compared with those in the usual Brans–Dicke theory with causal thermodynamics.

Bianchi types I and V bulk viscous fluid cosmological models in f(R, T) gravity theory

Open Physics ◽  
2014 ◽  
Vol 12 (10) ◽  
Author(s):  
Shri Ram ◽  
Priyanka Kumari
Keyword(s):  
Viscous Fluid ◽  
Cosmological Models ◽  
Gravity Theory ◽  
Field Equations ◽  
Bulk Viscous Fluid ◽  
Bulk Viscous ◽  
Special Value ◽  
The Universe ◽  
Average Scale Factor ◽  
Bianchi Types

AbstractIn this paper we present non-singular Bianchi types I and V cosmological models, in the presence of bulk viscous fluid and within the framework of f(R,T) gravity theory. Exact solutions to the field equations are obtained by choosing a particular form of the function f(R,T) and a special value for the average scale factor of the model, which corresponds to a time- dependent deceleration parameter. The cosmological models initially accelerate for a certain period of time and thereafter decelerate. The physical and kinematical properties of the models of the universe are discussed.

scholarly journals PLANE-SYMMETRIC INHOMOGENEOUS BULK VISCOUS COSMOLOGICAL MODELS WITH VARIABLE Λ

2003 ◽  
Vol 12 (05) ◽  
pp. 941-951 ◽  
Author(s):  
ANIRUDH PRADHAN ◽  
HARE RAM PANDEY
Keyword(s):  
Cosmological Model ◽  
Viscous Fluid ◽  
Cosmological Constant ◽  
Ad Hoc ◽  
Fluid Distribution ◽  
Geometric Features ◽  
Plane Symmetric ◽  
Bulk Viscous Fluid ◽  
Variable Λ ◽  
Bulk Viscous

A plane-symmetric non-static cosmological model representing a bulk viscous fluid distribution has been obtained which is inhomogeneous and anisotropic and a particular case of which is gravitationally radiative. Without assuming any ad hoc law, we obtain a cosmological constant as a decreasing function of time. The physical and geometric features of the models are also discussed.

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