Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-17
Phys.Rev.D59:014010,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages (LaTeX-RevTeX), 14 PostScript figures
Scientific paper
10.1103/PhysRevD.59.014010
We study the chiral phase transition of QCD at finite temperature and density by numerically solving Schwinger-Dyson equation for the quark propagator with the improved ladder approximation in the Landau gauge. Using the solution we calculate a pion decay constant from a generalized version of Pagels-Stokar formula. Chiral phase transition point is determined by analyzing an effective potential for the quark propagator. We find solutions for which chiral symmetry is broken while the value of the effective potential is larger than that for the chiral symmetric vacuum. These solutions correspond to meta-stable states, and the chiral symmetric vacuum is energetically favored. We present a phase diagram on the general temperature--chemical potential plane, and show that phase transitions are of first order in wide range.
Harada Masayasu
Shibata Akihiro
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