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Phys. Rev. C 69, 065802 (2004) [8 pages]

Hybrid stars with color superconductivity within a nonlocal chiral quark model

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H. Grigorian*
Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany, and Department of Physics, Yerevan State University, 375025 Yerevan, Armenia

D. Blaschke†
Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany, and Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia

D. N. Aguilera‡
Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany, and Instituto de Física Rosario, Bv. 27 de febrero 210 bis, 2000 Rosario, Argentina

Received 6 February 2004; published 23 June 2004

The equation of state for quark matter is derived for a nonlocal, chiral quark model within the mean field approximation. Special emphasis is on the occurrence of a diquark condensate which signals a phase transition to color superconductivity and its effects on the equation of state. We present a fit formula for the Bag pressure, which is density dependent in the case when the quark matter is color superconducting. We calculate the quark star configurations by solving the Tolman-Oppenheimer-Volkoff equations and demonstrate the effects of diquark condensation on the stability of hybrid stars for different form factors of the quark interaction.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.69.065802
DOI:
10.1103/PhysRevC.69.065802
PACS:
26.60.+c, 04.40.Dg, 12.38.Mh, 97.60.Jd

*Electronic address: hovik@darss.mpg.uni-rostock.de

†Electronic address: david.blaschke@physik.uni-rostock.de

‡Electronic address: deborah@darss.mpg.uni-rostock.de

 
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