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Effect of color superconductivity on the mass and radius of a quark star
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We compare quark stars made of color-superconducting quark matter to normal-conducting quark stars. We focus on the most simple color-superconducting system, a two-flavor color superconductor, and employ the Nambu-Jona-Lasinio (NJL) model to compute the gap parameter and the equation of state. By varying the strength of the four-fermion coupling of the NJL model, we study the mass and the radius of the quark star as a function of the value of the gap parameter. If the coupling constant exceeds a critical value, the gap parameter does not vanish even at zero density. For coupling constants below this critical value, mass and radius of a color-superconducting quark star change at most by ca. 20% compared to a star consisting of normal-conducting quark matter. For coupling constants above the critical value mass and radius may change by factors of two or more.
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The petit four of color-superconducting phases in proto-neutron star evolution
Along constant-baryon-number cooling tracks, color-superconducting cores in proto-neutron stars follow four scenarios, with stable cold CSC only in a narrow high-mass band for the chosen EoS.
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