Relativistic compact stars in Tolman spacetime via an anisotropic approach

Bhar, Piyali; Rej, Pramit; Takisa, P. Mafa; Zubair, M.

doi:10.1140/epjc/s10052-021-09340-0

Cited by 15 publications

(17 citation statements)

References 92 publications

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“…Thus, the presence of charge generates a more stable structure as compared to the uncharged model. Our analysis follows the consistent increasing trend of length, energy and entropy of charged analogs presented in GR as well as other modified theories of gravity [36,37,39,40]. Furthermore, we have found that under the influence of f (R, T 2 ) gravity, the physical attributes of gravastar have greater values of length, energy and entropy in comparison to work presented in GR and f (R, T ) gravity [36,37].…”

Section: Final Remarkssupporting

confidence: 85%

“…Bhatti et al [38] explored the stability of charged gravastar in the modified gravity. Bhar and Rej [39] studied gravastar admitting conformal motion to analyze the contribution of charge to the stability region for the discussed model. Bhatti and his collaborators [40] also studied gravastar structure in the context of f (G) gravity, where G is Gauss-Bonnet invariant.…”

Section: Introductionmentioning

confidence: 99%

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Stable Charged Gravastar Model in ${f}(\mathfrak{R},\textbf{T}^{2})$ Gravity with Conformal Motion

Sharif¹,

Naz²

2022

Preprint

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This paper investigates the influence of charge on physical features of gravastars in the framework of energy-momentum squared gravity. A gravastar is an alternate model to a black hole that comprises of three distinct regions, namely the intermediate shell, inner and outer sectors. Different values of the barotropic equation of state parameter provide the mathematical formulation for these regions. We construct the structure of a gravastar admitting conformal motion for a specific model of energy-momentum squared gravity. The field equations are formulated for a spherically symmetric spacetime with charged perfect matter distribution. For the smooth matching of external and internal spacetimes, we use Israel matching criteria. Various physical attributes of gravastars such as the equation of state parameter, proper length, entropy and energy are investigated (in the presence of charge) versus thickness of the shell. The charge in the inner core of gravastars preserves the state of equilibrium by counterbalancing the inward gravitational force. It is concluded that the non-singular solutions of charged gravastar are physically viable in the background of energy-momentum squared gravity.

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Section: Final Remarkssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Stable Charged Gravastar Model in ${f}(\mathfrak{R},\textbf{T}^{2})$ Gravity with Conformal Motion

Sharif¹,

Naz²

2022

Preprint

View full text Add to dashboard Cite

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“…It is worthwhile to mention here that the length, energy and entropy of a gravastar increase with respect to thickness of the shell as compared to the uncharged case [46]. Our analysis follows a consistent increasing trend of the physical properties in the presence of charge, presented in GR as well as other modified theories of gravity [38,39,42,43]. The matching of the charged inner sphere and Reissner-Nordstrom metric produces gravitational mass which behaves as an electromagnetic mass model.…”

Section: Discussionsupporting

confidence: 74%

“…Thus, the presence of charge generates a more stable structure as compared to the uncharged model [46]. Furthermore, we have found that the physical attributes of gravastar have greater values in EMSG as compared to GR and other modified theories of gravity [38,39,42,43]. We conclude that f (R, T 2 ) gravity successfully discusses charged gravastar model.…”

Section: Discussionmentioning

confidence: 59%

“…Bhatti et al [41] explored the stability of charged gravastar in the modified gravity. Bhar and Rej [42] studied gravastar admitting conformal motion to analyze the contribution of charge on the stability of the considered model. Bhatti and his collaborators [43] also investigated gravastars in the realm of f (G) gravity, where G defines Gauss-Bonnet invariant.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Charge on Gravastars in $f(\mathfrak{R},\mathcal{T}^{2})$ Gravity

Sharif¹,

Naz²

2022

Preprint

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This paper studies the influence of charge on a compact stellar structure also regarded as vacuum condensate star in the background of f (R, T 2 ) gravity. This object is considered the alternate of black hole whose structure involves three distinct regions, i.e., interior, exterior and thin-shell. We analyze these domains of a gravastar for a particular model of this modified theory. In the inner region of a gravastar, the considered equation of state defines that energy density is equal to negative pressure which is the cause of repulsive force on the spherical shell. In the intermediate shell, pressure and energy density are equal and contain ultra-relativistic fluid. The inward-directed gravitational pull of thin-shell counterbalance the force exerted by the inner region of a gravastar allowing the formation of a singularity-free object. The Reissner-Nordstrom metric presents the outer vacuum spherical domain. Moreover, we discuss the impact of the charge on physical attributes of a gravastar such as the equation of state parameter, entropy, proper length and energy. We conclude that singularityfree solutions of charged gravastar are physically consistent in this modified theory.

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Existence of Dark Energy Stars within Lower Mass Gap in the Realm of f(Q)$f(Q)$ Gravity

Bhar

2023

Fortschritte der Physik

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The object of this article is to study a new class of dark energy stars in the background of gravity by using the metric potentials proposed by Krori‐Barua [J. Phys. A, Math. Gen. 8:508 (1975)]. To achieve the goal, a quadratic form of as is taken into account for the static spherically symmetric spacetime,`a' being a coupling parameter of gravity. The maximum allowable masses with corresponding radii have been obtained via plots for and 8. The obtained maximum masses from our analysis are found in the range . For a smaller value of the coupling parameter ‘a’ associated with gravity, more massive stars are found. The radii corresponding to the maximum masses also increase with decreasing ‘a’. In particular, when , the theory can achieve a dark energy star of mass for certain specific combinations of model parameters. This obtained mass is located within a mass in the range of and that can be a lighter object in the GW190814 event detected by LIGO/VIRGO experiments.

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Relativistic compact stars in Tolman spacetime via an anisotropic approach

Cited by 15 publications

References 92 publications

Stable Charged Gravastar Model in ${f}(\mathfrak{R},\textbf{T}^{2})$ Gravity with Conformal Motion

Stable Charged Gravastar Model in ${f}(\mathfrak{R},\textbf{T}^{2})$ Gravity with Conformal Motion

Impact of Charge on Gravastars in $f(\mathfrak{R},\mathcal{T}^{2})$ Gravity

Existence of Dark Energy Stars within Lower Mass Gap in the Realm of f(Q)$f(Q)$ Gravity

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