Dissipative collapse of a Karmarkar star

Govender, M.; Maharaj, Aneshkumar; Singh, Ksh. Newton; Pant, Neeraj

doi:10.1142/s0217732320501643

Cited by 31 publications

(17 citation statements)

References 57 publications

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“…Some recent examples of charged static stars and their interesting properties are given in [1][2][3][4][5][6]. In radiating stars, the radial pressure at the stellar boundary is nonvanishing [7][8][9][10]. As a result, in the modeling of a charged radiating stellar structure, an additional differential equation has to be solved, in addition to the field equations.…”

Section: Introductionmentioning

confidence: 99%

Radiating composite stars with electromagnetic fields

Maharaj

Brassel

2021

Eur. Phys. J. C

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We derive the junction conditions for a general spherically symmetric radiating star with an electromagnetic field across a comoving surface. The interior consists of a charged composite field containing barotropic matter, a null dust and a null string fluid. The exterior atmosphere is described by the generalised Vaidya spacetime. We generate the boundary condition at the stellar surface showing that the pressure is determined by the interior heat flux, anisotropy, null density, charge distribution and the exterior null string density. A new physical feature that arises in our analysis is that the surface pressure depends on the internal charge distribution for generalised Vaidya spacetimes. It is only in the special case of charged Vaidya spacetimes that the matching interior charge distribution is equal to the exterior charge at the surface as measured by an external observer. Previous treatments, for neutral matter and charged matter, arise as special cases in our treatment of composite matter.

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Section: Introductionmentioning

confidence: 99%

Radiating composite stars with electromagnetic fields

Maharaj

Brassel

2021

Eur. Phys. J. C

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“…This approach is also relevant in the modelling of dark matter in the rotational curves galaxies with color-flavor-locked CFL distributions. As demonstrated in Singh et al (2020a), Govender et al (2020 and Singh et al (2020b) the embedding approach also produces physically acceptable results with relevant equations of state.…”

Section: Discussionmentioning

confidence: 77%

Model of compact star with ordinary and dark matter

Takisa

Leeuw

Maharaj

2020

Astrophys Space Sci

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We study compact stars formed by dark and ordinary matter, with attributes of both neutron star matter and quark star matter. We assume an equation of state for dark matter which is consistent with the rotational curves of galaxies and for color-flavor-locked (CFL) distributions for ordinary matter. This is done in the curved Krori-Barua spacetime geometry in general relativity. We find new exact solutions of dark matter admixed compact objects, with maximum mass 2.67 M and radius around 11.16 km, with 52.40% of dark matter content. By varying the dark matter ratio, we obtain the masses of dark compact stars with masses less than 2.67 M . Keywords Einstein equations • Compact stars • Equation of state 1 IntroductionA quark star is made up of self-bound strange quark matter and its also known as a hypothetical stellar object (see

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“…For the solution, we use the Karmarkar condition [51][52][53]. These conditions determine gravitational potentials for static and non-static systems [54][55][56][57]. We must mention here that similar studies on f (R) gravity have been carried out in [41].…”

Section: Introductionmentioning

confidence: 99%

Gravitationally collapsing stars in f(R) gravity

Jaryal

Chatterjee

2021

Eur. Phys. J. C

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The gravitational dynamics of a collapsing matter configuration which is simultaneously radiating heat flux is studied in f(R) gravity. Three particular functional forms in f(R) gravity are considered to show that it is possible to envisage boundary conditions such that the end state of the collapse has a weak singularity and that the matter configuration radiates away all of its mass before collapsing to reach the central singularity.

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Dissipative collapse of a Karmarkar star

Cited by 31 publications

References 57 publications

Radiating composite stars with electromagnetic fields

Radiating composite stars with electromagnetic fields

Model of compact star with ordinary and dark matter

Gravitationally collapsing stars in f(R) gravity

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