Strange Stars with a Density-Dependent Bag Parameter

Details Strange Stars with a Density-Dependent Bag Parameter Strange Stars with a Density-Dependent Bag Parameter

2003-09-17

arxiv.org/abs/astro-ph/0309472v2

Phys.Rev.D69:103001,2004

Astronomy and Astrophysics

Astrophysics

23 pages, 8 figs; v2: 25 pages, 9 figs, version to be published in Phys. Rev. (D)

Scientific paper

10.1103/PhysRevD.69.103001

We have studied strange quark stars in the framework of the MIT bag model, allowing the bag parameter B to depend on the density of the medium. We have also studied the effect of Cooper pairing among quarks, on the stellar structure. Comparison of these two effects shows that the former is generally more significant. We studied the resulting equation of state of the quark matter, stellar mass-radius relation, mass-central-density relation, radius-central-density relation, and the variation of the density as a function of the distance from the centre of the star. We found that the density-dependent B allows stars with larger masses and radii, due to stiffening of the equation of state. Interestingly, certain stellar configurations are found to be possible only if B depends on the density. We have also studied the effect of variation of the superconducting gap parameter on our results.

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