Possible formation of compact stars in f ( R , T ) $f(R,T)$ gravity

Zubair, M.; Abbas, G.; Noureen, Ifra

doi:10.1007/s10509-015-2596-9

Cited by 146 publications

(63 citation statements)

References 41 publications

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“…Among several astrophysical applications it is worthy of mentioning the Refs. [43][44][45][46][47][48][49][50][51][52]. In their work [43] Sharif et al have studied the stability of collapsing spherical body of an isotropic fluid distribution considering the nonstatic spherically symmetric line element.…”

Section: Introductionmentioning

confidence: 99%

Gravastars in f(R,T) gravity

Das¹,

Ghosh²,

Guha³

et al. 2017

Phys. Rev. D

190

118

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We propose a unique stellar model under the f (R, T ) gravity by using the conjecture of MazurMottola [P. Mazur and E. Mottola, Report number: LA-UR-01-5067., P. Mazur and E. Mottola, Proc. Natl. Acad. Sci. USA 101, 9545 (2004).] which is known as gravastar and a viable alternative to the black hole as available in literature. This gravastar is described by the three different regions, viz., (I) Interior core region, (II) Intermediate thin shell, and (III) Exterior spherical region. The pressure within the interior region is equal to the constant negative matter density which provides a repulsive force over the thin spherical shell. This thin shell is assumed to be formed by a fluid of ultrarelativistic plasma and the pressure, which is directly proportional to the matter-energy density according to Zel'dovich's conjecture of stiff fluid [Y.B. Zel'dovich, Mon. Not. R. Astron. Soc. 160, 1 (1972).], does counterbalance the repulsive force exerted by the interior core region. The exterior spherical region is completely vacuum and assumed to be de Sitter spacetime which can be described by the Schwarzschild solution. Under this specification we find out a set of exact and singularity-free solution of the gravastar which presents several other physically valid features within the framework of alternative gravity.

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Section: Introductionmentioning

confidence: 99%

Gravastars in f(R,T) gravity

Das¹,

Ghosh²,

Guha³

et al. 2017

Phys. Rev. D

190

118

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“…Quadratic EOS parameters have been used to study the properties of compact stars [46,47]. For the sake of simplicity, in this work we assume a linear EOS [48]:…”

Section: Physical Analysis and Graphical Representationmentioning

confidence: 99%

Physical attributes of anisotropic compact stars in f(R, G) gravity

Shamir

Zia

2017

Eur. Phys. J. C

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Modified gravity is one of the potential candidates to explain the accelerated expansion of the universe. Current study highlights the materialization of anisotropic compact stars in the context of f (R, G) theory of gravity. In particular, to gain insight in the physical behavior of three stars namely, Her X 1, SAX J 1808-3658 and 4U 1820-30, energy density, and radial and tangential pressures are calculated. The f (R, G) gravity model is split into a Starobinsky like f (R) model and a power law f (G) model. The main feature of the work is a 3-dimensional graphical analysis in which, anisotropic measurements, energy conditions and stability attributes of these stars are discussed. It is shown that all three stars behave as usual for positive values of the f (G) model parameter n.

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“…[58][59][60][61][62][63][64][65]. Sharif et al [58] have discussed the stability of a collapsing spherical body of an isotropic fluid distribution considering the non-static spherically symmetric line element.…”

Section: Introductionmentioning

confidence: 99%

“…The evolution of a spherical star by applying a perturbation scheme on the f (R, T ) field equations has been explored by Noureen et al [61], while in the work [62] the dynamical analysis for gravitating sources along with axial symmetry has been discussed. Zubair et al [63] investigated the possible formation of compact stars in f (R, T ) theory of gravity using the analytic solution of the Krori and Barua metric to the spherically symmetric anisotropic star. The effects of f (R, T ) gravity on gravitational lensing has been discussed by Ahmed et al [64].…”

Section: Introductionmentioning

confidence: 99%

Compact stars in $$f(R,\mathcal {T})$$ f ( R , T ) gravity

et al. 2016

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In the present paper we generate a set of solutions describing the interior of a compact star under f (R, T ) theory of gravity which admits conformal motion. An extension of general relativity, the f (R, T ) gravity is associated to Ricci scalar R and the trace of the energy-momentum tensor T . To handle the Einstein field equations in the form of differential equations of second order, first of all we adopt the Lie algebra with conformal Killing vectors (CKV) which enable one to get a solvable form of such equations and second we consider the equation of state (EOS) p = ωρ with 0 < ω < 1 for the fluid distribution consisting of normal matter, ω being the EOS parameter. We therefore analytically explore several physical aspects of the model to represent behavior of the compact stars such as-energy conditions, TOV equation, stability of the system, Buchdahl condition, compactness and redshift. It is checked that the physical validity and the acceptability of the present model within the specified observational constraint in connection to a dozen of the compact star candidates are quite satisfactory.

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Possible formation of compact stars in f ( R , T ) $f(R,T)$ gravity

Cited by 146 publications

References 41 publications

Gravastars in f(R,T) gravity

Gravastars in f(R,T) gravity

Physical attributes of anisotropic compact stars in f(R, G) gravity

Compact stars in $$f(R,\mathcal {T})$$ f ( R , T ) gravity

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