scholarly journals Wet Dark Fluid Cosmological Model in Barber Self-Creation Theory of Gravitation

2021 ◽  
Vol 13 (3) ◽  
pp. 869-878
Author(s):  
S. C. Wankhade ◽  
A. S. Nimkar ◽  
A. M. Pund
Keyword(s):  
Cosmological Model ◽  
Bianchi Type ◽  
Wet Dark Fluid ◽  
Type Viii ◽  
Dark Fluid ◽  
Radiation Universe ◽  
Theory Of Gravitation ◽  
The Relationship ◽  
The Universe

This paper investigates a Bianchi type VIII cosmological model with wet dark fluid in Barber self-creation theory of gravitation. To get the determinate model of the Universe, we have assumed the relationship between metric coefficients R and S. Also, the behavior of the model in the radiation Universe and the physical implications of the model are discussed in detail.

Bianchi Type-III Magnetized Wet Dark Fluid Cosmological Model in General Relativity

2010 ◽  
Vol 50 (2) ◽  
pp. 339-348 ◽  
Author(s):  
K. S. Adhav ◽  
M. V. Dawande ◽  
R. S. Thakare ◽  
R. B. Raut
Keyword(s):  
General Relativity ◽  
Cosmological Model ◽  
Bianchi Type ◽  
Wet Dark Fluid ◽  
Type Iii ◽  
Dark Fluid

Tilted Bianchi Type III Wet Dark Fluid Cosmological Model in Saez and Ballester Theory

2015 ◽  
Vol 55 (1) ◽  
pp. 526-534 ◽  
Author(s):  
Subrata Kumar Sahu ◽  
Endale Nigatu Kantila ◽  
Dawit Melese Gebru
Keyword(s):  
Cosmological Model ◽  
Bianchi Type ◽  
Wet Dark Fluid ◽  
Type Iii ◽  
Dark Fluid

Tilted Bianchi type-VI0 wet dark fluid cosmological model

2015 ◽  
Vol 357 (2) ◽  
Author(s):  
Subrata Kumar Sahu ◽  
Ayelign Gota Goda ◽  
Gebretsadik Gidey Weldemariam
Keyword(s):  
Cosmological Model ◽  
Bianchi Type ◽  
Wet Dark Fluid ◽  
Dark Fluid ◽  
Bianchi Type Vi0

scholarly journals Anisotropic Cosmological Model in a Modified Theory of Gravitation

Universe ◽  
2021 ◽  
Vol 7 (7) ◽  
pp. 226
Author(s):  
Rishi Kumar Tiwari ◽  
Aroonkumar Beesham ◽  
Soma Mishra ◽  
Vipin Dubey
Keyword(s):  
Cosmological Model ◽  
Modified Gravity ◽  
Bianchi Type ◽  
Late Time ◽  
Type I ◽  
Bianchi Models ◽  
Theory Of Gravitation ◽  
The Universe ◽  
Type Parameter ◽  
Modified Theory

Current observations indicate that, on a large enough scale, the universe is homogeneous and isotropic. However, this does not preclude the possibility of some anisotropy having occurred during the early stages of the evolution of the universe, which could then have been damped out later. This idea has aroused interest in the Bianchi models, which are homogeneous but anisotropic. Secondly, there is much interest in modified gravity these days due to the problems that the usual ΛCDM model faces in general relativity. Hence, in this paper, a study was conducted on the Bianchi type-I cosmological model in f(R,T)-modified gravity. Following some ideas from cosmography, a specific form of the deceleration parameter was assumed, leading to a model that exhibited a transition from early deceleration to late-time acceleration. The derived model approached isotropy at late times. The physical properties of the model were discussed, and expressions for the various parameters of the model were derived. It is also possible to make progress towards solving the cosmological constant problem, since in this model in f(R,T) gravity, a variable cosmological-type parameter arose, which was large early on but decreased to a constant value in later times.

Universe with wet dark fluid: A dynamical systems approach

2019 ◽  
Vol 16 (08) ◽  
pp. 1950127 ◽  
Author(s):  
S. Angit ◽  
Rakesh Raushan ◽  
R. Chaubey
Keyword(s):  
Dynamical Systems ◽  
Equation Of State ◽  
Cosmological Model ◽  
Evolution Equations ◽  
Systems Approach ◽  
Wet Dark Fluid ◽  
Dark Fluid ◽  
State Formula ◽  
Frw Cosmological Model ◽  
The Universe

We investigate the dynamical systems analysis of Friedmann–Robertson–Walker (FRW) cosmological model with wet dark fluid. A new equation of state for the dark energy component of the Universe has been used. It is modeled by the equation of state [Formula: see text], which can describe a liquid, e.g. water. To analyze the evolution equations, we have introduced suitable transformation of variables. The evolution of corresponding solutions is presented by curves in the phase–plane diagram. The nature of critical points are analyzed and stable attractors are examined for our cosmological model. We determine the classical stabilities of these cosmologies. We also examine the transition of early decelerating stage of the Universe to present the accelerating stage of the Universe.

Dynamics of Bianchi type-V anisotropic dark energy cosmological model in a scale covariant theory of gravitation

2018 ◽  
Vol 1 (3) ◽  
Author(s):  
Dandala Radhakrishna Reddy 1
Keyword(s):  
Dark Energy ◽  
Cosmological Model ◽  
Bianchi Type ◽  
Covariant Theory ◽  
Scale Covariant Theory ◽  
Anisotropic Dark Energy ◽  
Theory Of Gravitation ◽  
Type V ◽  
The Universe ◽  
Bianchi Type V

This paper is devoted to the discussion of dynamical properties of anisotropic dark energy cosmological model of the universe in a Bianchi type-V space time in the framework of scale covariant theory of gravitation formulated by Canuto et al.(phys.Rev.Lett.39:429,1977).A  dark energy cosmological model is presented by solving the field equations of this theory by using some physically viable conditions. The dynamics of the model is  studied  by computing the cosmological parameters, dark energy density, equation of state(EoS) parameter, skewness parameters, deceleration parameter and the jerk parameter. This being a scalar field model gives us the quintessence model of the universe which describes a significant dark energy candidate of our accelerating universe. All the physical quantities discussed are in agreement with the recent cosmological observations.

scholarly journals Mixed fluid cosmological model in f(R, T) gravity

2020 ◽  
Vol 98 (11) ◽  
pp. 1015-1022 ◽  
Author(s):  
Parbati Sahoo ◽  
Barkha Taori ◽  
K.L. Mahanta
Keyword(s):  
Cosmological Model ◽  
Bianchi Type ◽  
Type I ◽  
Time Varying ◽  
Eos Parameter ◽  
Barotropic Fluid ◽  
Rotationally Symmetric ◽  
Expansion Of The Universe ◽  
The Universe ◽  
Mixed Fluid

We construct a locally rotationally symmetric (LRS) Bianchi type-I cosmological model in f(R, T) theory of gravity when the source of gravitation is a mixture of barotropic fluid and dark energy (DE) by employing a time-varying deceleration parameter. We observe through the behavior of the state finder parameters (r, s) that our model begins from the Einstein static era and goes to ΛCDM era. The equation of state (EOS) parameter (ωd) for DE varies from the phantom (ω < –1) phase to quintessence (ω > –1) phase, which is consistent with observational results. It is found that the discussed model can reproduce the current accelerating phase of the expansion of the universe.

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