TY - JOUR
T1 - Quark mass effects on the stability of hybrid stars
AU - Buballa, M.
AU - Neumann, F.
AU - Oertel, M.
AU - Shovkovy, I.
N1 - Funding Information:
We would like to thank M. Hanauske for providing us with the data of their hadronic equation of state [22] . We also thank V. Werth for having pointed out to us a numerical mistake in the first version of the manuscript. The work of I.S. was supported by Gesellschaft für Schwerionenforschung (GSI) and by Bundesministerium für Bildung und Forschung (BMBF).
PY - 2004/8/12
Y1 - 2004/8/12
N2 - We perform a study of the possible existence of hybrid stars with color superconducting quark cores using a specific hadronic model in a combination with an NJL-type quark model. It is shown that the constituent mass of the non-strange quarks in vacuum is a very important parameter that controls the beginning of the hadron-quark phase transition. At relatively small values of the mass, the first quark phase that appears is the two-flavor color superconducting (2SC) phase which, at larger densities, is replaced by the color-flavor locked (CFL) phase. At large values of the mass, on the other hand, the phase transition goes from the hadronic phase directly into the CFL phase avoiding the 2SC phase. It appears, however, that the only stable hybrid stars obtained are those with the 2SC quark cores.
AB - We perform a study of the possible existence of hybrid stars with color superconducting quark cores using a specific hadronic model in a combination with an NJL-type quark model. It is shown that the constituent mass of the non-strange quarks in vacuum is a very important parameter that controls the beginning of the hadron-quark phase transition. At relatively small values of the mass, the first quark phase that appears is the two-flavor color superconducting (2SC) phase which, at larger densities, is replaced by the color-flavor locked (CFL) phase. At large values of the mass, on the other hand, the phase transition goes from the hadronic phase directly into the CFL phase avoiding the 2SC phase. It appears, however, that the only stable hybrid stars obtained are those with the 2SC quark cores.
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U2 - 10.1016/j.physletb.2004.05.064
DO - 10.1016/j.physletb.2004.05.064
M3 - Article
AN - SCOPUS:3843112114
SN - 0370-2693
VL - 595
SP - 36
EP - 43
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-4
ER -