Color superconducting quark matter core in the third family of compact stars
- 20 June 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 67 (12), 123003
- https://doi.org/10.1103/physrevd.67.123003
Abstract
We investigate first order phase transitions from β-equilibrated hadronic matter to color-flavor-locked quark matter in a compact star interior. The hadronic phase including hyperons and a Bose-Einstein condensate of mesons is described by a relativistic field theoretical model with density dependent meson-baryon couplings. The early appearance of hyperons and/or a Bose-Einstein condensate of mesons delays the onset of the phase transition to higher density. In the presence of hyperons and/or a condensate, the overall equations of state become softer, resulting in smaller maximum masses than the cases without hyperons and a condensate. We find that the maximum mass neutron stars may contain a mixed phase core of hyperons, condensate, and color superconducting quark matter. Depending on the parameter space, we also observe that there is a stable branch of superdense stars called the third family branch beyond the neutron star branch. Compact stars in the third family branch may contain a pure color superconducting core and have radii smaller than those of the neutron star branch. Our results are compared with the recent observations on RX J185635-3754 and the recently measured mass-radius relationship by the X-ray Multi Mirror–Newton observatory.
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This publication has 43 references indexed in Scilit:
- Gravitationally redshifted absorption lines in the X-ray burst spectra of a neutron starNature, 2002
- Twinkle, twinkle, neutron starNature, 2002
- Is RX J1856.5−3754 a Quark Star?The Astrophysical Journal, 2002
- Toward a Mass and Radius Determination of the Nearby Isolated Neutron Star RX J185635−3754The Astrophysical Journal, 2002
- Antikaon condensation in neutron starsNuclear Physics A, 2000
- Kaon Condensation and Dynamical Nucleons in Neutron StarsPhysical Review Letters, 1998
- Composition and structure of protoneutron starsPhysics Reports, 1997
- Hyperon-rich matter in neutron starsPhysical Review C, 1996
- Strange condensate realignment in relativistic heavy ion collisionsPhysics Letters B, 1987
- Strange goings on in dense nucleonic matterPhysics Letters B, 1986