Scenario of a two-fluid FRW cosmological model with dark energy

2017 ◽  
Vol 132 (3) ◽  
Author(s):  
R. K. Tiwari ◽  
A. Beesham ◽  
B. K. Shukla
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Frw Cosmological Model ◽  
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.

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.

A 4D TWO-FLUID FRW COSMOLOGICAL MODEL IN INDUCED-MATTER THEORY

2006 ◽  
Vol 15 (02) ◽  
pp. 165-169
Author(s):  
GUANG-WEN MA ◽  
QIAN-KAI YAO
Keyword(s):  
Cosmological Model ◽  
Extra Dimension ◽  
Physical Space ◽  
Flat Space ◽  
Space Time ◽  
Ricci Flat ◽  
Matter Theory ◽  
Frw Cosmological Model ◽  
Induced Matter ◽  
Two Fluid

In induced-matter theory, a 4D non-empty physical space–time is obtained from the 5D Ricci-flat one by setting the extra dimension coordinate equal to a constant. On the basis of this theory, we construct a 4D physical space–time by choosing a certain supersurface equation F(xA) = 0 (A runs over 0 ~ 4). It is shown that, the 4D two-fluid FRW cosmological model can be obtained from 5D flat space–time by specifying F(xA) = 0 as x4-x0 = 0.

Dynamics of anisotropic dark energy universe embedded in one-directional magnetized fluid

2019 ◽  
Vol 28 (07) ◽  
pp. 1950093 ◽  
Author(s):  
Pratik P. Ray ◽  
B. Mishra ◽  
S. K. Tripathy
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Power Law ◽  
Scale Factor ◽  
Mathematical Formalism ◽  
Physical Parameters ◽  
Volumetric Expansion ◽  
Anisotropic Dark Energy ◽  
Two Fluid

In this work, we have constructed an anisotropic dark energy cosmological model in a two-fluid situation, such as the usual dark energy and the magnetized fluid. We have assumed the dark energy pressure to be anisotropic in different spatial directions. In order to develop the mathematical formalism of the model, we have considered the scale factor as hybrid scale factor which is a combination of both power law and exponential volumetric expansion law. The physical parameters are derived and analyzed and found to be in agreement with the observational limits.

Anisotropic ghost dark energy cosmological model with hybrid expansion law

New Astronomy ◽  
2017 ◽  
Vol 57 ◽  
pp. 70-75 ◽  
Author(s):  
Chandra Rekha Mahanta ◽  
Nitin Sarma
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Ghost Dark Energy

scholarly journals OBSERVATIONAL CONSTRAINTS ON THE GENERALIZED CHAPLYGIN GAS

2009 ◽  
Vol 18 (13) ◽  
pp. 2007-2022 ◽  
Author(s):  
SERGIO DEL CAMPO ◽  
J. R. VILLANUEVA
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Chaplygin Gas ◽  
Observational Constraints ◽  
Energy Component ◽  
Generalized Chaplygin Gas ◽  
Astronomical Data ◽  
Astronomical Observations ◽  
Dark Energy Component ◽  
Two Parameters

In this paper we study a quintessence cosmological model in which the dark energy component is considered to be the generalized Chaplygin gas and the curvature of the three-geometry is taken into account. Two parameters characterize this sort of fluid: ν and α. We use different astronomical data for restricting these parameters. It is shown that the constraint ν ≲ α agrees well enough with the astronomical observations.

scholarly journals The Dark Sector in the Baryon Phase Transition Cosmology

2019 ◽  
Author(s):  
Frederick J. Mayer
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Dark Energy ◽  
Cosmological Model ◽  
Dark Sector

This brief communication considers and illustrates dark matter and dark energy within the Baryon Phase Transition (BPT) cosmological model as well as some experiments that may confirm (or deny) the validity of the model.

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