Comparative analysis of Einstein gravity and Rastall gravity for the compact objects

Abbas, G.; Shahzad, M. R.

doi:10.1016/j.cjph.2019.10.011

Cited by 39 publications

(10 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Initially, Λ was assumed to be a constant quantity, but as time passed it was understood that it was a scalar variable rather than a constant number. Λ changes with time and its obtained decreasing value is about (≤ 10 −56 cm 2 ), which is consistent with the observational evidences [17]. The remarkable effects of the variation of Λ, in the astrophysical scenario, have been studied in great detail by [18,19].…”

Section: Introductionsupporting

confidence: 86%

Gravitational Lensing in Kerr-Newman Anti de Sitter Spacetime

Mangut¹,

Gürsel²,

Сакалли³

2021

Preprint

View full text Add to dashboard Cite

In this paper we study the effects of the cosmological constant and rotation on the deflection angle of null geodesics in the equatorial plane of Kerr-Newman anti de Sitter (KNAdS) spacetime.To this end, we employ the extension of Rindler-Ishak method to compute the gravitational lensing effect. Gravitational lensing phenomena based on diffraction of light have been studied for some stars and black holes, which are assumed to fit the KNAdS geometry. The results obtained are essential and important for studies in cosmology.

show abstract

Section: Introductionsupporting

confidence: 86%

Gravitational Lensing in Kerr-Newman Anti de Sitter Spacetime

Mangut¹,

Gürsel²,

Сакалли³

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Rahaman et al [22] investigated a singularity-free model for a anisotropic charged fluid by considering equations of state for Chaplygin gas model. In the literature, many authors studied Krori and Barua metric forms for different aspect in the presence of particular gravitational theories [23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Compact Stars in κ(R, T) Gravity

Taṣer

Doğru

2023

Preprint

View full text Add to dashboard Cite

The study is to organized for investigation of a new solution for stellarobjects in κ(R, T ) theory. We investigate whether Krori-Barua modelproduces valid results in κ(R, T ) theory. We attain field equationsthrough Krori-Barua metric form related with geometry of inner space.From field equations, we obtain all unknown matter components κ(T ) =8πG−λT case in the theory. Constructed model is considered with someclass of compact stars such as 4U1820 − 30, SAXJ1808.4 − 3658and HerX − 1. To prove physical stability of constructed model, weinvestigate both normal and effective matter form behaviors by way ofsome physical conditions. It is found that all conditions are valid foreffective matter. Therefore, this study reveals consistency of both thecompact star model and the gravitation theory. But remarkable point isthat normal matter has to face with some problem in the κ(R, T ) theory.

show abstract

“…Recently, Rastall theory has been reviewed extensively by many researchers [40][41][42][43][44][45][46]. Debnath [47] has explored the solutions of gravastars in Rastall-Rainbow gravity.…”

Section: Introductionmentioning

confidence: 99%

Isotropic Gravastar Model in Rastall Gravity

Abbas

Majeed

2020

Advances in Astronomy

Self Cite

View full text Add to dashboard Cite

In the present paper, we have introduced a new model of gravastar with an isotropic matter distribution in Rastall gravity by the Mazur–Mottola (2004) mechanism. Mazur–Mottola approach is about the construction of gravastar which is predicted as an alternative to black hole. By following this convention, we define gravastar in the form of three phases. The first one is an interior phase which has negative density; the second part consists of thin shell comprising ultrarelativistic stiff fluid for which we have discussed the length, energy, and entropy. By the graphical analysis of entropy, we have shown that our proposed thin shell gravastar model is potentially stable. The third phase of gravastar is defined by the exterior Schwarzschild geometry. For the interior of gravastar, we have found the analytical solutions free from any singularity and the event horizon in the framework of Rastall gravity.

show abstract

Comparative analysis of Einstein gravity and Rastall gravity for the compact objects

Cited by 39 publications

References 50 publications

Gravitational Lensing in Kerr-Newman Anti de Sitter Spacetime

Gravitational Lensing in Kerr-Newman Anti de Sitter Spacetime

Compact Stars in κ(R, T) Gravity

Isotropic Gravastar Model in Rastall Gravity

Contact Info

Product

Resources

About