Compact relativistic star with quadratic envelope

We consider an uncharged anisotropic stellar model with two distinct equations of state in general relativity. The core layer has a quark matter distribution with a linear equation of state. The envelope layer has a matter distribution which is quadratic. The interfaces between the core, envelope an...

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Bibliographic Details
Published in:Pramāṇa 2019-03, Vol.92 (3), p.1-8, Article 40
Main Authors: Takisa, P Mafa, Maharaj, S D, Mulangu, C
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Astroparticles
Equations of state
Linear equations
Observations and Techniques
Physics
Physics and Astronomy
Pulsars
Relativity
Stellar models
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Summary:We consider an uncharged anisotropic stellar model with two distinct equations of state in general relativity. The core layer has a quark matter distribution with a linear equation of state. The envelope layer has a matter distribution which is quadratic. The interfaces between the core, envelope and the vacuum exterior regions are smoothly matched. We find radii, masses and compactifications for five different compact objects which are consistent with other investigations. In particular, the properties of the pulsar object PSR J1614-2230 are studied. The metric functions and the matter distribution are regular throughout the star. In particular, it is shown that the radii associated with the core and the envelope can change for different parameter values.
ISSN:0304-4289
0973-7111
DOI:10.1007/s12043-018-1695-x