scholarly journals Two-Fluid Dark Energy Models in Bianchi Type-III Universe with Variable Deceleration Parameter

2013 ◽  
Vol 52 (8) ◽  
pp. 2735-2752 ◽  
Author(s):  
Hassan Amirhashchi ◽  
Anirudh Pradhan ◽  
Rekha Jaiswal
Keyword(s):  
Dark Energy ◽  
Deceleration Parameter ◽  
Bianchi Type ◽  
Variable Deceleration Parameter ◽  
Type Iii ◽  
Energy Models ◽  
Two Fluid

Variable deceleration parameter and dark energy models

2016 ◽  
Vol 13 (05) ◽  
pp. 1650055 ◽  
Author(s):  
Binaya K. Bishi
Keyword(s):  
Dark Energy ◽  
Deceleration Parameter ◽  
Linear Relation ◽  
Bianchi Type ◽  
State Parameter ◽  
Momentum Tensor ◽  
Field Equations ◽  
Variable Deceleration Parameter ◽  
Energy Models ◽  
Expansion Scalar

This paper deals with the Bianchi type-III dark energy model and equation of state parameter in a first class of [Formula: see text] gravity. Here, [Formula: see text] and [Formula: see text] represents the Ricci scalar and trace of the energy momentum tensor, respectively. The exact solutions of the modified field equations are obtained by using (i) linear relation between expansion scalar and shear scalar, (ii) linear relation between state parameter and skewness parameter and (iii) variable deceleration parameter. To obtain the physically plausible cosmological models, the variable deceleration parameter with the suitable substitution leads to the scale factor of the form [Formula: see text], where [Formula: see text] and [Formula: see text] are arbitrary constants. It is observed that our models are accelerating for [Formula: see text] and for [Formula: see text], transition phase from deceleration to acceleration. Further, we have discussed physical properties of the 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.

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