Charged thin-shell gravastars in noncommutative geometry

Овгун, Али; Banerjee, Ayan; Jusufi, Kimet

doi:10.1140/epjc/s10052-017-5139-4

Cited by 49 publications

(25 citation statements)

References 58 publications

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“…In this section, we are interested in checking the stability of gravastars. For this purpose we define a new parameter η as the ratio of the derivatives of σ and P as follows: Övgün et al [122] used the above parameter which plays a fundamental role in determining the stability regions of the respective solutions of charged thin-shell gravastar model within the context of noncommutative geometry. Yousaf et al [123] also discussed the stability of the gravastar model in f (R, T ) gravity in the presence of charge.…”

Section: Stability Of the Gravastarmentioning

confidence: 99%

Stable and self-consistent charged gravastar model within the framework of $$f(R,\,T)$$ gravity

Bhar¹,

Rej²

2021

Eur. Phys. J. C

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In this work, we discuss the configuration of a gravastar (gravitational vacuum stars) in the context of $$f(R, \,T )$$ f ( R , T ) gravity by employing the Mazur–Mottola conjecture (Mazur and Mottola in Report No. LA-UR-01-5067, 2001; Mazur and Mottola, Proc Natl Acad Sci USA 101:9545, 2004). The gravastar is conceptually a substitute for a black hole theory as available in the literature and it has three regions with different equation of states. By assuming that the gravastar geometry admits a conformal Killing vector, the Einstein–Maxwell field equations have been solved in different regions of the gravastar by taking a specific equation of state as proposed by Mazur and Mottola. We match our interior spacetime to the exterior spherical region which is completely vacuum and described by the Reissner–Nordström geometry. For the particular choice of $$f(R,\,T)$$ f ( R , T ) of $$f(R, \,T )=R+2\gamma T$$ f ( R , T ) = R + 2 γ T , here we analyze various physical properties of the thin shell and also present our results graphically for these properties. The stability analysis of our present model is also studied by introducing a new parameter $$\eta $$ η and we explore the stability regions. Our proposed gravastar model in the presence of charge might be treated as a successful stable alternative of the charged black hole in the context of this version of gravity.

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Section: Stability Of the Gravastarmentioning

confidence: 99%

Stable and self-consistent charged gravastar model within the framework of $$f(R,\,T)$$ gravity

Bhar¹,

Rej²

2021

Eur. Phys. J. C

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“…They explored the dynamical stability of the transition layer for some specific cases and found that stable regions are enhanced near the formation of the expected event horizon. Lobo et al [15] explored the stability of gravastars related to the matter distribution in the transition layer.Övgün et al [16] constructed thin-shell gravastars in the background of noncommutative geometry and examined stability regions through radial perturbation about the equilibrium shell radius. Shamir and Ahmad [17] discussed various physical characteristics like, entropy, the EoS parameter, length of the shell, energy-thickness relation of the gravastar shell model in f (G, T ) gravity.…”

Section: Introductionmentioning

confidence: 99%

Stability of gravastars with exterior regular black holes

Sharif

Javed

2020

Annals of Physics

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This paper examines the stability of thin-shell gravastars in the context of regular spacetimes (Bardeen and Bardeen-de Sitter black holes). We apply cut and paste approach to construct gravastars through the matching of interior non-singular de Sitter geometry with exterior regular black hole. This model contains three regions, i.e., interior, thin-shell and exterior. The interior and exterior regions are connected at thin-shell. We investigate physical viability of the developed model by the energy conditions and explore its stability by using radial perturbation about the equilibrium shell radius. It is found that thin-shell gravastars show large stable regions for the Bardeen-de Sitter black hole as compared to the Bardeen black hole. It is concluded that stable regions exist near the formation of expected event horizon.

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“…Lobo and Garattini [14] investigated the stability of noncommutative thin-shell gravastar and found that stable regions must exist near the expected position of the event horizon. Övgün et al [15] developed thin-shell gravastar model from the matching of exterior charged noncommutative BH with interior DS manifold. They found that the developed structure follows the null energy condition and shows stable behavior for some suitable values of physical parameter near the expected event horizon.…”

Section: Introductionmentioning

confidence: 99%

Stability of charged thin-shell gravastars with quintessence

Sharif

Javed

2021

Eur. Phys. J. C

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This paper develops a new solution of gravitational vacuum star in the background of charged Kiselev black holes as an exterior manifold. We explore physical features and stability of thin-shell gravastars with radial perturbation. The matter thin layer located at thin-shell greatly affects stable configuration of the developed structure. We assume three different choices of matter distribution such as barotropic, generalized Chaplygin gas and generalized phantomlike equation of state. The last two models depend on the shell radius, also known as variable equation of state. For barotropic model, the structure of thin-shell gravastar is mostly unstable while it shows stable configuration for such type of matter distribution with extraordinary quintessence parameter. The resulting gravastar structure indicates stable behavior for generalized Chaplygin gas but unstable for generalized phantomlike model. It is also found that proper length, entropy and energy within the shell show linear relation with thickness of the shell.

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Charged thin-shell gravastars in noncommutative geometry

Cited by 49 publications

References 58 publications

Stable and self-consistent charged gravastar model within the framework of $$f(R,\,T)$$ gravity

Stable and self-consistent charged gravastar model within the framework of $$f(R,\,T)$$ gravity

Stability of gravastars with exterior regular black holes

Stability of charged thin-shell gravastars with quintessence

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