Anisotropic charged core envelope star

Takisa, P. Mafa; Maharaj, S. D.

doi:10.1007/s10509-016-2840-y

Cited by 50 publications

(31 citation statements)

References 26 publications

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“…Inspired from many previous revealed famous articles [78,79,80,81,82,83,84,85,86,87,88,89,90], we have taken static, spherical symmetric metric for this pulsar model. The Einstein field equations for the metric Eq.…”

Section: Interior Spacetimementioning

confidence: 99%

Does dark matter admixed pulsar exist?

2020

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In this paper, we have considered a twofluid model assuming that the pulsars are made of ordinary matter admixed with dark matter.Contribution of dark matter comes from the fitting of the rotation curves of the SPARC sample of galaxies[95]. For this we have investigated the dark matter based on the Singular Isothermal Sphere (SIS) dark matter density profile in the galactic halo region. Considering this twofluid model, we have studied the physical features of the pulsars present in different galaxy in details. Here, we compute the probable radii, compactness (u) and surface red-shift (Z s

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Section: Interior Spacetimementioning

confidence: 99%

Does dark matter admixed pulsar exist?

2020

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“…In favour of anisotropy Kalam et al [26] have developed a star model and showed that central density depends on anisotropic factor. For recent investigations, there have been important efforts in describing relativistic stellar structure in [27][28][29][30]. The algorithm for solutions of Einstein field equation via.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic compact stars in the Buchdahl model: A comprehensive study

et al. 2019

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In this article we present a class of relativistic solutions describing spherically symmetric and static anisotropic stars in hydrostatic equilibrium. For this purpose, we consider a particularized metric potential, namely, Buchdahl ansatz [Phys. Rev. D 116, 1027(1959.] which encompasses almost all the known analytic solution to the spherically symmetric, static Einstein field equations(EFEs) with a perfect fluid source, including in particular the Vaidya-Tikekar and Finch-Skea. We here developed the model by considering anisotropic spherically symmetric static general relativistic configuration that plays a significant effect on the structure and properties of stellar objects. We have considered eight different cases for generalized Buchdahl dimensionless parameter K, and analyzed them in an uniform manner. As a result it turns out that all the considered cases are valid at every point in the interior spacetime. In addition to this, we show that the model satisfies all the energy conditions and maintain hydrostatic equilibrium equation. In the frame work of anisotropic hypothesis, we consider analogue objects with similar mass and radii such as LMC X-4, SMC X-1, EXO 1785-248 etc to restrict the model parameter arbitrariness. Also, establishing a relation between pressure and density in the form of P = P (ρ), we demonstrate that EoSs can be approximated to a linear function of density. Despite the simplicity of this model, the obtained results are satisfactory.

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“…Empirically, in order to design the core envelope model, the Darmois-Isreali conditions should be satisfied at the junction of the core and the envelope. With this empirical aspect, many authors [1,[12][13][14][15][16][17][18][19][20][21][22] have developed stellar models, with an assumption of a core and an envelope, for highly dense relativistic objects. Eventually in most of the core-envelope solutions so far obtained have the continuity of only metric potentials and pressure at the junction of the core and the envelope.…”

Section: Introductionmentioning

confidence: 99%

Core-envelope model of super dense star with distinct equation of states

2019

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The aim of the present paper is to study an anisotropic spherically symmetric core-envelope model of a super dense star in which core is equipped with linear equation of state, consistent with the quark matter while the envelope is considered to be of quadratic equation of state by adopting the philosophy of Takisa et al. (Pramana J Phys 92:40, 2019). We demonstrate that all the physical parameters are realistic within the core as well as envelope of the stellar object and continuous at the junction. Our model is shown to be physically viable and substantiate with the strange stars SAX J1808.4-3658 and 4U1608-52. Further, We infer that if the mass of the star increases then central density results to higher values and core shrinks, which justifies the dominating effect of gravity for higher mass celestial objects.

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Anisotropic charged core envelope star

Cited by 50 publications

References 26 publications

Does dark matter admixed pulsar exist?

Does dark matter admixed pulsar exist?

Anisotropic compact stars in the Buchdahl model: A comprehensive study

Core-envelope model of super dense star with distinct equation of states

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