Strange Stars with a Density-Dependent Bag Parameter

Abstract

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.

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

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• On the Lack of Thermal Emission from the Quiescent Black Hole XTE J1118+480: Evidence for the Event Horizon
• A generalized Finch-Skea class one static solution
• Magnetized strange quark matter in a quasiparticle description
• Wormhole solutions in $f(Q,T)$ gravity with a radial dependent B parameter
• Hybrid stars are compatible with recent astrophysical observations
• Constraints on Density Dependent MIT Bag Model Parameters for Quark and Hybrid Stars
• Quark cores in extensions of the MIT Bag model
• Constraint on the equation of state of strange quark star: Perturbative QCD along with a density-dependent bag constant
• Density resummation of perturbation series in a pion gas to leading order in chiral perturbation theory
• Prospects for compact hexaquarks under the limitation imposed by quark confinement