Locally rotationally symmetric Bianchi type I cosmology in <i>f</i>(<i>R</i>) gravity

Shamir, M. Farasat; Raza, Zahid

doi:10.1139/cjp-2014-0338

Cited by 16 publications

(2 citation statements)

References 76 publications

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“…In this study they [68] examined a new classification of embedded class-I solutions of compact stars. In the context of f(R) gravity, the LRS Bianchi type I universe is investigated, and reveal three solutions with corresponding Killing symmetries in [69] and [70]. Shamir et al [71] studied the relativistic construction of compact astronomical solutions in f(R) gravity and found that the Bardeen model of black holes describes physically realistic stellar structures.…”

Section: Introductionmentioning

confidence: 99%

The reconstruction of constant jerk parameter with f(R, T) gravity in Bianchi-I spacetime

2023

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We have developed a Bianchi I cosmological model of the universe in f (R, T ) gravity theory which fit good with the present day scenario of accelerating universe. The model displays transition from deceleration in the past to the acceleration at the present. As in the ΛCDM model, we have defined the three energy parameters Ω m , Ω µ and Ω σ such that Ω m + Ω µ + Ω σ = 1. The parameter Ω m is the matter energy density (baryons + dark matter), Ω µ is the energy density associated with the Ricci scalar R and the trace T of the energy momentum tensor and Ω σ is the energy density associated with the anisotropy of the universe. We shall call Ω µ dominant over the other two due to its higher value. We find that the Ω µ and the other two in the ratio 3:1. 46 Hubble OHD data set is used to estimate present values of Hubble H 0 , deceleration q 0 and jerk j parameters. 1σ, 2σ and 3σ contour region plots for the estimated values of parameters are presented. 580 SNIa supernova distance modulus data set and 66 pantheon SNIa data which include high red shift data in the range 0 ≤ z ≤ 2.36 have been used to draw error bar plots and likelihood probability curves for distance modulus and apparent magnitude of SNIa supernova's. We have calculated the pressures and densities associated with the two matter densities, viz., p µ , ρ µ , p m and ρ m , respectively. The present age of the universe as per our model is also evaluated and it is found at par with the present observed values.

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Section: Introductionmentioning

confidence: 99%

The reconstruction of constant jerk parameter with f(R, T) gravity in Bianchi-I spacetime

2023

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“…The Bianchi type-I string cosmological model with bulk viscosity was examined by Tiwari and Sonia [46] . Many cosmologists [47][48][49] have explored the Bianchi type-I models from a different perspective. Now we can say that Spatially homogeneous and anisotropic cosmological models play an important role in the description of large-scale phenomena in the cosmos.…”

Section: Introductionmentioning

confidence: 99%

A new class of holographic dark energy models in LRS Bianchi Type-I

Pradhan,

Bhardwaj,

Dixit

et al. 2022

Preprint

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In this paper, we examine the (LRS) Bianchi-type-I cosmological model with holographic dark energy. The exact solutions to the corresponding field equations are obtained by using generalized hybrid expansion law (HEL). The EoS parameter ω for DE is found to be time dependent and redshift dependent and its exiting range for derived model is agreeing well with the current observations. Here we likewise apply two mathematical diagnostics, the statefinder (r, s) and ω d − ω ′ d plane to segregate HDE model from the ΛCDM model. Here the ω d − ω ′ d diagnostic trajectories is the good tool to classifying the dynamical DE model. We found that our model lies in both thawing region and freezing region. We have also construct the potential as well as dynamics of the quintessence and tachyon scalar field. Some physical and geometric properties of this model along with the physical acceptability of cosmological solution have been discussed in detail.

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Anisotropic compact stars in f(T) gravity

Abbas

Kanwal

Zubair

2015

Astrophys Space Sci

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This paper deals with the theoretical modeling of anisotropic compact stars in the framework of f (T ) theory of gravity, where T is torsion scalar. To this end, we have used the exact solutions of Krori and Barua metric to a static spherically symmetric metric. The unknown constants involved in the Krori and Barua metric have been specified by using the masses and radii of compact stars 4U 1820-30, Her X-1, SAX J 1808-3658. The physical properties of these stars have been analyzed in the framework of f (T ) theory. In this setting, we have checked the anisotropic behavior, regularity conditions, stability and surface redshift of the compact stars.

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Locally rotationally symmetric Bianchi type I cosmology in f(R) gravity

Cited by 16 publications

References 76 publications

The reconstruction of constant jerk parameter with f(R, T) gravity in Bianchi-I spacetime

The reconstruction of constant jerk parameter with f(R, T) gravity in Bianchi-I spacetime

A new class of holographic dark energy models in LRS Bianchi Type-I

Anisotropic compact stars in f(T) gravity

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