TILTED BIANCHI TYPE-V BAROTROPIC FLUID COSMOLOGICAL MODELS WITH VARIABLE BULK VISCOSITY IN GENERAL RELATIVITY

2011 ◽  
Vol 26 (24) ◽  
pp. 4299-4310
Author(s):  
RAJ BALI ◽  
PRAMILA KUMAWAT ◽  
SHALINI SHARMA
Keyword(s):  
General Relativity ◽  
Heat Conduction ◽  
Bulk Viscosity ◽  
Bianchi Type ◽  
Deterministic Model ◽  
Cosmological Models ◽  
Barotropic Fluid ◽  
Type V ◽  
The Universe ◽  
Bianchi Type V

Tilted Bianchi type-V barotropic fluid cosmological models with heat conduction and variable bulk viscosity is investigated. To get the deterministic model of the universe, we have assumed two conditions: (i) A = (BC)nand (ii) ζθ = const where A, B, C are metric potentials, n is a constant, ζ the coefficient of bulk viscosity, θ the expansion in the model. The behavior of the model in presence and absence of bulk viscosity and singularities in the model are discussed. Some thermodynamic relations and physical aspects of the model related to the observation on the present day universe are also discussed.

scholarly journals Bianchi type-V string cosmological models in general relativity

Pramana ◽  
2011 ◽  
Vol 76 (4) ◽  
pp. 681-690 ◽  
Author(s):  
ANIL KUMAR YADAV ◽  
VINEET KUMAR YADAV ◽  
LALLAN YADAV
Keyword(s):  
General Relativity ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Type V ◽  
Bianchi Type V

Probing kinematics and fate of Bianchi type V Universe

2020 ◽  
Vol 35 (27) ◽  
pp. 2050224
Author(s):  
G. K. Goswami ◽  
Anil Kumar Yadav ◽  
B. Mishra
Keyword(s):  
Dark Energy ◽  
Bianchi Type ◽  
Cosmological Parameters ◽  
Late Time ◽  
Barotropic Fluid ◽  
Dark Energy Component ◽  
Bianchi Type V Universe ◽  
Type V ◽  
The Universe ◽  
Bianchi Type V

In this paper, we have constrained the cosmological parameters of Bianchi type V universe by bounding the model under consideration with recent observational [Formula: see text] and Pantheon data. It is assumed that the energy conservation law holds separately for barotropic fluid and dark energy fluid i.e. dark energy component does not interact with barotropic matter. We obtain the present value of deceleration parameter and age of universe as [Formula: see text] and 13.329 Gyrs respectively. The analysis of [Formula: see text] and jerk parameters concur that the derived model approaches [Formula: see text]CDM universe at late time. We find that estimated values of Hubble’s constant and energy density parameters have pretty consistency with their corresponding values, obtained by recent observations of WMAP and PLANCK collaborations. It is also observed that the universe shows signature flipping from decelerating to accelerating phase for transitional red-shift value [Formula: see text] in past.

Some Bianchi type-V accelerating cosmological models in f(R,T) = f1(R) + f2(T) formalism

2020 ◽  
Vol 17 (10) ◽  
pp. 2050159
Author(s):  
Vinod Kumar Bhardwaj ◽  
Anil Kumar Yadav
Keyword(s):  
Phase Transition ◽  
Bianchi Type ◽  
Cosmological Models ◽  
Accelerated Expansion ◽  
Field Equations ◽  
Geometrical Properties ◽  
Energy Scenario ◽  
Type V ◽  
The Universe ◽  
Bianchi Type V

In this paper, we have studied the transition and physical behavior of Bianchi type-V cosmological models within the formalism of [Formula: see text] gravity. To obtain the solution of field equations and phase transition of universe consistent with recent cosmological observations, time varying deceleration parameters are considered. In this paper, we used two different scale factors of the form (i) [Formula: see text], where [Formula: see text] are constants. Here, for [Formula: see text] the universe shows transition with accelerated expansion. (ii) [Formula: see text], where [Formula: see text] and [Formula: see text] are constants. For [Formula: see text], the universe achieves a phase transition from early decelerating to current accelerating phase. The model I initially starts with quintessence scenario ([Formula: see text]) and ends up with ([Formula: see text]) as a model with cosmological constant ([Formula: see text]) as [Formula: see text]. Model II, for [Formula: see text] indicates the phantom energy scenario and for [Formula: see text], the model starts with quintessence [Formula: see text] and ends with vacuum energy scenario. A point type singularity has been observed in the derived model I. Some physical and geometrical properties of the models have been established and discussed to derive the validity of models with respect to recent astrophysical observations.

scholarly journals Tilted cosmological models of Bianchi type V

2006 ◽  
Vol 73 (4) ◽  
Author(s):  
Michael Bradley ◽  
Daniel Eriksson
Keyword(s):  
Bianchi Type ◽  
Cosmological Models ◽  
Type V ◽  
Bianchi Type V
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