Chiral symmetry restoration at finite temperature and chemical potential in the improved ladder approximation

This is the authors' abstract. We don't add key points for this paper.

The chiral symmetry of QCD is studied at finite temperature and chemical potential using the Schwinger-Dyson equation in the improved ladder approximation. We calculate three order parameters: the vacuum expectation value of the quark bilinear operator, the pion decay constant, and the quark mass gap. We have a second order phase transition at the temperature Tc=169 MeV along the zero chemical potential line, and a first order phase transition at the chemical potential μc=598 MeV along the zero temperature line. We also calculate the critical exponents of the three order parameters.