scholarly journals Bianchi Type III Anisotropic Dark Energy Models with Constant Deceleration Parameter

2010 ◽  
Vol 50 (1) ◽  
pp. 218-227 ◽  
Author(s):  
Anil Kumar Yadav ◽  
Lallan Yadav
Keyword(s):  
Dark Energy ◽  
Deceleration Parameter ◽  
Bianchi Type ◽  
Constant Deceleration Parameter ◽  
Type Iii ◽  
Anisotropic Dark Energy ◽  
Energy Models

Bianchi type-III dark energy models with constant deceleration parameter in self-creation cosmology

2014 ◽  
Vol 92 (4) ◽  
pp. 295-301 ◽  
Author(s):  
K.L. Mahanta ◽  
A.K. Biswal ◽  
P.K. Sahoo
Keyword(s):  
Dark Energy ◽  
Deceleration Parameter ◽  
Bianchi Type ◽  
Background Radiation ◽  
Distance Modulus ◽  
Constant Deceleration Parameter ◽  
Eos Parameter ◽  
Type Iii ◽  
Proper Distance ◽  
Type Ia

We have constructed dark energy cosmological models in an anisotropic Bianchi type-III space–time with a variable equation of state (EoS) parameter ω in Barber’s (Gen. Relativ. Gravitation, 14, 117, 1982) second self-creation theory of gravitation. The models are obtained using the special law of variation of Hubble’s parameter that yields a constant value of the deceleration parameter. In the two different models that we have obtained, the EoS parameter ω for dark energy is found to be time dependent. In one model the value of ω is in good agreement with the recent observations of type Ia supernovae (SNe Ia) data, SNe Ia data with cosmic microwave background radiation anisotropy and galaxy clustering statistics. Further we have discussed the well-known astrophysical phenomena, namely, the Hubble parameter H(z), luminosity distance dL, proper distance d(z), distance modulus μ(z), and look-back time with red shift. The expression for jerk parameter and statefinder parameters are also derived.

Evaluation of Bianchi type VI0 magnetized anisotropic dark energy models with constant deceleration parameter in bimetric theory of gravitation

2015 ◽  
Vol 24 (02) ◽  
pp. 1550019 ◽  
Author(s):  
M. S. Borkar ◽  
A. Ameen
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Bianchi Type ◽  
Constant Deceleration Parameter ◽  
Exponential Law ◽  
Anisotropic Dark Energy ◽  
Energy Models ◽  
Visible Matter ◽  
Theory Of Gravitation ◽  
The Universe

In this paper, Bianchi type VI0 magnetized anisotropic dark energy models with constant deceleration parameter have been studied by solving the Rosen's field equations in Bimetric theory of gravitation. The models corresponding to power law expansion and exponential law expansion have been evaluated and studied their nature geometrically and physically. It is seen that there is real visible matter (baryonic matter) suddenly appeared only for small interval of time 0.7 ≤ t < 0.7598 and for the remaining whole range of time t, there is dark energy matter in the universe. Our investigations are supported to the observational fact that the usual matter described by known particle theory is about 4% and the dark energy cause the accelerating expansion of the universe and several high precision observational experiments, especially the Wilkinson Microwave Anisotropic Probe (WMAP) satellite experiment (see [C. L. Bennett et al., Astrophys. J. Suppl. Ser. 148 (2003) 1; WMAP Collab. (D. N. Spergel et al.), Astrophys. J. Suppl. Ser. 148 (2003) 175; D. N. Spergel et al., Astrophys. J. Suppl. 170 (2007) 377; WMAP Collab. (E. Komastu et al.), Astrophys. J. Suppl. 180 (2009) 330; WMAP Collab. (G. Hinshaw et al.), Astrophys. J. Suppl. 208 (2013) 19; Plank Collab. (P. A. R. Ade), arXiv:1303.5076; arXiv:1303.5082]) conclude that the dark energy occupies near about 73% of the energy of the universe and dark matter is about 23%. In exponential law of expansion, our model is fully occupied by real visible matter and there is no chance of dark energy and dark matter.

scholarly journals Anisotropic dark energy Bianchi type III cosmological models in the Brans–Dicke theory of gravity

2012 ◽  
Vol 90 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Muhammad Farasat Shamir ◽  
Akhlaq Ahmad Bhatti
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Cosmological Model ◽  
Bianchi Type ◽  
Constant Deceleration Parameter ◽  
Physical Behavior ◽  
Type Iii ◽  
Anisotropic Dark Energy ◽  
Theory Of Gravity ◽  
Physical Quantities

The main purpose of this paper is to explore the solutions of Bianchi type III cosmological model in Brans–Dicke theory of gravity in the background of anisotropic dark energy. We use the assumption of constant deceleration parameter and power law relation between scalar field [Formula: see text] and scale factor a to find the solutions. The physical behavior of the solutions has been discussed using some physical quantities.

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