Quark and Nuclear Matter in the Linear Chiral Meson Model

Details Quark and Nuclear Matter in the Linear Chiral Meson Model Quark and Nuclear Matter in the Linear Chiral Meson Model

1998-11-18

arxiv.org/abs/hep-ph/9811387v2

Int.J.Mod.Phys. A18 (2003) 3189-3220

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, Int.J.Mod.Phys.A version

Scientific paper

10.1142/S0217751X03014034

We present an analytical description of the phase transitions from a nucleon gas to nuclear matter and from nuclear matter to quark matter within the same model. The equation of state for quark and nuclear matter is encoded in the effective potential of a linear sigma model. We exploit an exact differential equation for its dependence upon the chemical potential $\mu$ associated to conserved baryon number. An approximate solution for vanishing temperature is used to discuss possible phase transitions as the baryon density increases. For a nucleon gas and nuclear matter we find a substantial density enhancement as compared to quark models which neglect the confinement to baryons. The results point out that the latter models are not suitable to discuss the phase diagram at low temperature.

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