Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-14
Nucl.Phys.A796:83-100,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 2 figures, uses entcs macro. Minor changes in wording
Scientific paper
10.1016/j.nuclphysa.2007.08.013
In the limit of a large number of colors, N_c, we suggest that gauge theories can exhibit several distinct phases at nonzero temperature and quark density. Two are familiar: a cold, dilute phase of confined hadrons, where the pressure is ~ 1, and a hot phase of deconfined quarks and gluons, with pressure ~ N_c^2. When the quark chemical potential mu ~ 1, the deconfining transition temperature, T_d, is independent of mu. For T < T_d, as mu increases above the mass threshold, baryons quickly form a dense phase where the pressure is ~ N_c. As illustrated by a Skyrme crystal, chiral symmetry can be both spontaneously broken, and then restored, in the dense phase. While the pressure is ~ N_c, like that of (non-ideal) quarks, the dense phase is still confined, with interactions near the Fermi surface those of baryons, and not of quarks. Thus in the chirally symmetric region, baryons near the Fermi surface are parity doubled. We suggest possible implications for the phase diagram of QCD.
McLerran Larry
Pisarski Robert D.
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