Effect of color superconductivity on the mass and radius of a quark star

  • 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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Author:Stefan Bernhard Rüster, Dirk-Hermann RischkeORCiDGND
Document Type:Preprint
Date of Publication (online):2007/02/26
Year of first Publication:2003
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2007/02/26
Source:http://www.arxiv.org/abs/nucl-th/0309022 ; Journal-ref: Phys.Rev. D69 (2004) 045011 s.a. http://link.aps.org/doi/10.1103/PhysRevD.69.045011
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht