Chiral-symmetry restoration transition in the presence of dynamical quarks

By Monte Carlo methods, we study the restoration of chiral symmetry at finite temperature for gauge theories with color group SU(3). The effect of dynamical quarks is taken into account using the pseudofermion method. Chiral symmetry is indeed restored at finite temperature for values of the coupling =6/g2 smaller than in the pure gauge case. We find signs of metastability in the neighborhood of the transition; this could suggest that the transition is discontinuous. The ratio Tch/TD1, where Tch(TD)390 MeV is the physical temperature at which chiral symmetry (confinement) is lost. The internal fermionic energy is measured also.