Gravitational decoupled solutions of axial string cosmology

Sharif, M.; Ama-Tul-Mughani, Qanitah

doi:10.1142/s0217732320500911

Cited by 36 publications

(18 citation statements)

References 34 publications

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“…Pérez Graterol [15] formulated new well-behaved anisotropic solutions by introducing deformations in the radial metric component of Buchdahl spacetime. Sharif and Ama-Tul-Mughani [16] obtained anisotropic extensions of string cloud. In a recent paper [17], Tello-Ortiz et al built anisotropic compact models by combining the techniques of embedding classone and MGD.…”

Section: Introductionmentioning

confidence: 99%

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Sharif

Majid

2020

Physics of the Dark Universe

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In this paper, we formulate black hole solutions through extended gravitational decoupling scheme in the framework of self-interacting Brans-Dicke theory. The addition of a new source in the matter distribution increases the degrees of freedom in the system of field equations. Transformations in radial as well as temporal metric functions split the system into two arrays. Each array includes the effects of only one source (either seed or additional). The seed source is assumed to be a vacuum and the corresponding system is specified through the Schwarzschild metric. In order to construct a suitable solution of the second system, constraints are applied on the metric potentials and energy-momentum tensor of the additional source. We obtain three solutions corresponding to different values of the decoupling parameter in the presence of a massive scalar field. The extra source is classified as normal or exotic through energy conditions. It is found that two solutions agree with the energy bounds and thus have normal matter as their source.

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Section: Introductionmentioning

confidence: 99%

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Sharif

Majid

2020

Physics of the Dark Universe

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“…Singh et al [32] developed isotropic solutions using Karmarkar's condition and then extended them to the anisotropic domain via MGD. Viable anisotropic extensions of a cloud of strings have also been obtained by employing the same technique [33]. Cedeño and Contreras [34] showed that the decoupling approach is also applicable in the field of cosmology by deforming FLRW and Kantowski-Sachs spacetimes.…”

Section: Introductionmentioning

confidence: 99%

Isotropization and Complexity of Decoupled Solutions in Self-interacting Brans-Dicke Gravity

Sharif¹,

Majid²

2022

Preprint

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The aim of this work is to formulate two new solutions by decoupling the field equations via a minimal geometric deformation in the context of self-interacting Brans-Dicke gravity. We introduce an extra source in the anisotropic fluid distribution to generate new analogs of existing solutions. The radial metric function is transformed to decouple the field equations into two sets such that each array corresponds to one source only. The system corresponding to the original matter distribution is specified by metric functions of well-behaved solutions. On the other hand, the second set is closed by imposing constraints on the additional matter source. For this purpose, we have applied the isotropization condition as well as vanishing complexity condition on the new source. Smooth matching of interior and exterior spacetimes at the junction provides values of the unknown constants. Interesting physical features of corresponding models are checked by employing the mass and radius of the star PSR J1614-2230. It is concluded that both extensions yield viable and stable models for certain values of the decoupling parameter.

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“…Sharif and Ama-Tul-Mughani [23] discussed the (2 + 1)-dimensional charged string cloud through this technique. They also formulated analytical solutions of axially symmetric geometry in the framework of cosmic strings through gravitational decoupling technique [24].…”

Section: Introductionmentioning

confidence: 99%

Compact objects by gravitational decoupling in f(R) gravity

Sharif

Aslam

2021

Eur. Phys. J. C

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The objective of this paper is to discuss anisotropic solutions representing static spherical self-gravitating systems in f(R) theory. We employ the extended gravitational decoupling approach and transform temporal as well as radial metric potentials which decomposes the system of non-linear field equations into two arrays: one set corresponding to seed source and the other one involves additional source terms. The domain of the isotropic solution is extended in the background of f(R) Starobinsky model by employing the metric potentials of Krori–Barua spacetime. We determine two anisotropic solutions by employing some physical constraints on the extra source. The values of unknown constants are computed by matching the interior and exterior spacetimes. We inspect the physical viability, equilibrium and stability of the obtained solutions corresponding to the star Her X-I. It is observed that one of the two extensions satisfies all the necessary physical requirements for particular values of the decoupling parameter.

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Gravitational decoupled solutions of axial string cosmology

Cited by 36 publications

References 34 publications

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Extended gravitational decoupled solutions in self-interacting Brans–Dicke theory

Isotropization and Complexity of Decoupled Solutions in Self-interacting Brans-Dicke Gravity

Compact objects by gravitational decoupling in f(R) gravity

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