Five Dimensional Axially Symmetric String Cosmological Models with Bulk Viscous Fluid

2009 ◽  
Vol 48 (8) ◽  
pp. 2311-2318 ◽  
Author(s):  
G. Mohanty ◽  
G. C. Samanta
Keyword(s):  
Viscous Fluid ◽  
Cosmological Models ◽  
Axially Symmetric ◽  
Bulk Viscous Fluid ◽  
Bulk Viscous

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 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).

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.

scholarly journals Dynamics of Bianchi V Ih universe with bulk viscous fluid in modified gravity

2018 ◽  
Vol 15 (03) ◽  
pp. 1850036 ◽  
Author(s):  
B. Mishra ◽  
Sankarsan Tarai ◽  
S. K. J. Pacif
Keyword(s):  
Viscous Fluid ◽  
Dynamical Behavior ◽  
Momentum Tensor ◽  
Matter Field ◽  
Energy Conditions ◽  
Anisotropic Universe ◽  
Late Time ◽  
Bulk Viscous Fluid ◽  
Bulk Viscous ◽  
Theory Of Gravity

In this paper, the dynamical behavior of the anisotropic universe has been investigated in [Formula: see text] theory of gravity. The functional [Formula: see text] has been rescaled in the form [Formula: see text], where [Formula: see text] is the Ricci scalar and [Formula: see text] is the trace of energy momentum tensor. Three cosmological models are constructed using the power law expansion in Bianchi type [Formula: see text] ([Formula: see text]) universe for three different values of [Formula: see text], where the matter field is considered to be of bulk viscous fluid. It is observed that the anisotropic [Formula: see text] model in the modified theory of gravity is in agreement with a quintessence phase for the value of [Formula: see text] and [Formula: see text]. We could not obtain a viable cosmological model in accordance with the present day observations for [Formula: see text]. The bulk viscous coefficient in both the cases are found to be positive and remain constant at late time. The physical behaviors of the models along with the energy conditions are also studied.

Sign in / Sign up

Export Citation Format

Share Document