scholarly journals Quasi-Isotropic Expansion for a Two-Fluid Cosmological Model Containing Radiation and String Gas

2019 ◽  
Vol 129 (4) ◽  
pp. 486-494
Author(s):  
I. M. Khalatnikov ◽  
A. Yu. Kamenshchik ◽  
A. A. Starobinsky
Keyword(s):  
Cosmological Model ◽  
Isotropic Expansion ◽  
Two Fluid

scholarly journals GENERALIZED MODEL FOR Λ DARK ENERGY

2009 ◽  
Vol 18 (03) ◽  
pp. 389-396 ◽  
Author(s):  
UTPAL MUKHOPADHYAY ◽  
P. C. RAY ◽  
SAIBAL RAY ◽  
S. B. DUTTA CHOUDHURY
Keyword(s):  
Dark Energy ◽  
Equation Of State ◽  
Cosmological Model ◽  
A Priori ◽  
State Parameter ◽  
Spherically Symmetric ◽  
Einstein Field Equations ◽  
Field Equations ◽  
Equation Of State Parameter ◽  
Two Fluid

Einstein field equations under spherically symmetric space–times are considered here in connection with dark energy investigation. A set of solutions is obtained for a kinematic Λ model, viz. [Formula: see text], without assuming any a priori value for the curvature constant and the equation-of-state parameter ω. Some interesting results, such as the nature of cosmic density Ω and deceleration parameter q, have been obtained with the consideration of two-fluid structure instead of the usual unifluid cosmological model.

scholarly journals Kantowski-Sachs Two Fluid Radiating Cosmological Model in Brans-Dicke Theory of Gravitation

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
V.U.M. Rao ◽  
◽  
G. Suryanarayana ◽  
Y. Aditya ◽  
◽  
...  
Keyword(s):  
Cosmological Model ◽  
Theory Of Gravitation ◽  
Two Fluid

scholarly journals Accelerating Anisotropic Cosmological Model Filled with Two Fluid and ∧

2020 ◽  
Vol 9 (3) ◽  
pp. 1590-1592
Keyword(s):  
Cosmological Model ◽  
Cosmological Constant ◽  
Perfect Fluid ◽  
Cosmological Parameters ◽  
Anisotropic Cosmological Model ◽  
Shear Scalar ◽  
Two Fluid

In this paper we have studied Kantowski-Sachs universe filled with perfect fluid and radiation with a cosmological constant. To get determinate solution, it is assumed that the scalar of expansion is proportional to shear scalar (    ) which leads to the relation between metric potentials n R AS The cosmological parameters of models are also discussed.

An interacting two-fluid scenario for dark energy in anisotropic cosmological model

2013 ◽  
Vol 91 (2) ◽  
pp. 180-187 ◽  
Author(s):  
T. Singh ◽  
R. Chaubey
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Energy Parameter ◽  
Constant Deceleration Parameter ◽  
Barotropic Fluid ◽  
Anisotropic Cosmological Model ◽  
Two Fluid Scenario ◽  
Type V ◽  
Two Fluid ◽  
Friedmann Robertson Walker

The open anisotropic cosmological model of the early Universe is considered. We study the evolution of the dark energy parameter within anisotropic Bianchi type-V cosmological model filled with barotropic fluid and dark energy. The solutions have been obtained for power law and exponential forms of the expansion parameter. (They correspond to constant deceleration parameter in general relativity.) For large time (i.e., t → ∞), the models tend asymptotically to an isotropic Friedmann–Robertson–Walker cosmological model under certain conditions.

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