Axially Symmetric Bulk Viscous Cosmological Model in F(R, T) Theory of Gravity

2021 ◽  
Vol 19 (1) ◽  
pp. 35-49
Author(s):  
G.R. Avchar ◽  
D.R. Golechha ◽  
S.D. Tade
Keyword(s):  
Cosmological Model ◽  
Axially Symmetric ◽  
Bulk Viscous ◽  
Theory Of Gravity

scholarly journals Bulk viscous cosmological model in f(R,T) theory of gravity

2019 ◽  
Vol 16 (01) ◽  
pp. 1950005 ◽  
Author(s):  
Partha Sarathi Debnath
Keyword(s):  
Cosmological Model ◽  
Cosmological Solution ◽  
Momentum Tensor ◽  
General Function ◽  
Geometrical Properties ◽  
Modified Gravity Theory ◽  
Bulk Viscous ◽  
Theory Of Gravity ◽  
Viscous Pressure ◽  
Bulk Viscous Pressure

In this paper, we have presented bulk viscous cosmological model of the universe in the modified gravity theory in which the Lagragian of the gravitational action contains a general function [Formula: see text], where [Formula: see text] and [Formula: see text] denote the curvature scalar and the trace of the energy–momentum tensor, respectively, in the framework of a flat Friedmann–Robertson–Walker model with isotropic fluid. We obtain cosmological solution in [Formula: see text] theory of gravity, specially of particular choice [Formula: see text], where [Formula: see text] is a constant, in the presence of bulk viscosity that are permitted in Eckart theory, Truncated Israel Stewart (TIS) theory and Full Israel Stewart (FIS) theory. The physical and geometrical properties of the models in Eckart, TIS theory and FIS theory are studied in detail. The analysis of the variation of bulk viscous pressure, energy density, scale factor, Hubble parameter and deceleration parameter with cosmic evolution is done in the respective theories. The models are analyzed by comparison with recent observational data. The cosmological models are compatible with observations.

scholarly journals Dynamics of Bulk Viscous String Cosmological Model in f(R,G) Theory of Gravity

2021 ◽  
Vol 4 (4) ◽  
pp. 89-97
Author(s):  
Kailas R. Borgade ◽  
S. R. Bhoyar ◽  
Vineeta Basotia
Keyword(s):  
Cosmological Model ◽  
Exact Solutions ◽  
Bianchi Type ◽  
The Self ◽  
Alternative Theory ◽  
Type I ◽  
Field Equations ◽  
Bianchi Type I ◽  
Bulk Viscous ◽  
Theory Of Gravity

Existing investigations dedicated to the self-propelling investigation of dynamics of bulk viscous string in LRS Bianchi type-I cosmological model within the circumstance of alternative theory of gravity with Langrangian be the impulsive perform of Ricci scalar R and Gouss-Bonnet invariant G , say f(R,G) gravity. Exact solutions of the field equations correspond to special law of variation which provides singular model. Also some physical and kinematical aspects and its behavior with the present day universe of the cosmological model have been 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.

Bulk viscous accelerating Universe in f(R, T) theory of gravity

Pramana ◽  
2020 ◽  
Vol 94 (1) ◽  
Author(s):  
R Prasad ◽  
Lalit Kumar Gupta ◽  
G K Goswami ◽  
Anil Kumar Yadav
Keyword(s):  
Accelerating Universe ◽  
Bulk Viscous ◽  
Theory Of Gravity

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.

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