Energy conditions in modified f(G) gravity

Bamba, Kazuharu; Ilyas, M.; Bhatti, M. Z.; Yousaf, Z.

doi:10.1007/s10714-017-2276-x

Cited by 135 publications

(47 citation statements)

References 69 publications

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“…Subsequently, Yousaf et al [26] studied the distribution of matter configuration for a self-gravitating spherical star and examined irregularity factors for dust, isotropic and anisotropic fluids in two regimes in f (R, T ) gravity. Bamba et al [27] considered flat FLRW model in the framework of f (G) gravity. They investigated energy conditions and found the viability bounds.…”

Section: Introductionmentioning

confidence: 99%

Physical parameters for stable f(R) models

Samanta¹,

Godani

2019

Indian J Phys

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Nojiri & Odintsov [1] and Hu & Sawicki [2] have studied non-linear functions in modified gravity that explain the cosmic acceleration without cosmological constant, fulfil the conditions of local gravity & stability and pass the solar system tests. In this paper, FRW model, a best fitted and fruitful mathematical model of the physical universe [3-6] is studied in the context of these non-linear functions. The cosmological implications such as Hubble parameter, deceleration parameter, jerk parameter, matter density and the effective equation of state parameter of the universe are plotted with respect to redshift. Subsequently, the age of the universe is predicted in f (R) gravity. All are found to represent the features of present phase of the universe.

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Section: Introductionmentioning

confidence: 99%

Physical parameters for stable f(R) models

Samanta¹,

Godani

2019

Indian J Phys

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“…Such type of investigations could provide theoretical well-consistent way to handle and study classes of massive and super massive structures at large scales. Bamba et al [73] claimed that modified gravitational dynamics could provide an additional platform in few regions of spacetime that could lead to stable configurations of relativistic system. In this paper, we found relatively stellar bodies with much higher densities than that found in GR [108] as seen from Fig.…”

Section: Various F (R T ) Modelsmentioning

confidence: 99%

“…Bamba et al [73] further checked the viability regimes on the parameters of f (G) gravity models and presented some mathematically consistent cosmic zones. The stability of gravitational evolving stellar bodies have been investigated in few models of f (R) gravity by [69,71].…”

Section: Introductionmentioning

confidence: 99%

Existence of compact structures in f(R, T) gravity

2018

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The present paper is devoted to investigate the possible emergence of relativistic compact stellar objects through modified f (R, T ) gravity. For anisotropic matter distribution, we used Krori and Barura solutions and two notable and viable f (R, T ) gravity formulations. By choosing particular observational data, we determine the values of constant in solutions for three relativistic compact star candidates. We have presented some physical behavior of these relativistic compact stellar objects and some aspects like energy density, radial as well as transverse pressure, their evolution, stability, Eos parameters, measure of anisotropy and energy conditions.

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“…Recently, Yousaf [94] explored various analytical models of the stellar filaments with dark source terms coming from the cosmological constant and checked the validity regimes of ECs in order to make them physically viable. Bamba et al [95] presented a general formalism for checking the viability of ECs in modified gravity. In f (R) gravity (having effective density and anisotropic pressure), the NEC and WEC are formulated as…”

Section: Energy Conditionsmentioning

confidence: 99%

Influence of $$f\,(R)$$ f ( R ) models on the existence of anisotropic self-gravitating systems

et al. 2017

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This paper aims to explore some realistic configurations of anisotropic spherical structures in the background of metric f (R) gravity, where R is the Ricci scalar. The solutions obtained by Krori and Barua are used to examine the nature of particular compact stars with three different modified gravity models. The behavior of material variables is analyzed through plots and the physical viability of compact stars is investigated through energy conditions. We also discuss the behavior of different forces, equation of state parameter, measure of anisotropy and Tolman-Oppenheimer-Volkoff equation in the modeling of stellar structures. The comparison from our graphical representations may provide evidence for the realistic and viable f (R) gravity models at both theoretical and the astrophysical scale.

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Energy conditions in modified f(G) gravity

Cited by 135 publications

References 69 publications

Physical parameters for stable f(R) models

Physical parameters for stable f(R) models

Existence of compact structures in f(R, T) gravity

Influence of $$f\,(R)$$ f ( R ) models on the existence of anisotropic self-gravitating systems

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