Effect of color superconductivity on the mass and radius of a quark star
Abstract
We compare quark stars made of colorsuperconducting quark matter to normalconducting quark stars. We focus on the most simple colorsuperconducting system, a twoflavor color superconductor, and employ the Nambu JonaLasinio (NJL) model to compute the gap parameter and the equation of state. By varying the strength of the fourfermion 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 colorsuperconducting quark star change at most by ∼20% compared to a star consisting of normalconducting quark matter. For coupling constants above the critical value, mass and radius may change by factors of two or more.
 Publication:

Physical Review D
 Pub Date:
 February 2004
 DOI:
 10.1103/PhysRevD.69.045011
 arXiv:
 arXiv:nuclth/0309022
 Bibcode:
 2004PhRvD..69d5011R
 Keywords:

 12.38.Mh;
 26.60.+c;
 97.10.q;
 Quarkgluon plasma;
 Nuclear matter aspects of neutron stars;
 Stellar characteristics and properties;
 Astrophysics;
 High Energy Physics  Phenomenology;
 Nuclear Theory
 EPrint:
 16 pages, 9 figures