Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-03-26
Phys.Rev. C66 (2002) 015202
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 18 PostScript figures, submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.66.015202
We compare different models for hadronic and quark phases of cold baryon-rich matter in an attempt to find a deconfinement phase transition between them. For the hadronic phase we consider Walecka-type mean-field models which describe well the nuclear saturation properties. We also use the variational chain model which takes into account correlation effects. For the quark phase we consider the MIT bag model, the Nambu-Jona-Lasinio and the massive quasiparticle models. By comparing pressure as a function of baryon chemical potential we find that crossings of hadronic and quark branches are possible only in some exceptional cases while for most realistic parameter sets these branches do not cross at all. Moreover, the chiral phase transition, often discussed within the framework of QCD motivated models, lies in the region where the quark phases are unstable with respect to the hadronic phase. We discuss possible physical consequences of these findings.
Greiner Walter
Mishustin Igor N.
Satarov L. M.
Stoecker Horst
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