Abstract

The chiral and deconfinement dynamics in QCD phase diagram are investigated by using the strong-coupling expansion of the lattice QCD with one species of staggered fermion and the Polyakov loop effective action at finite temperature (T) and quark chemical potential (m). Effective potential Feff involves both the chiral (Uc(1)) and the deconfinement (ZNc) dynamics with finite coupling effects in the mean-field approximation. The Polyakov loop increasing rate (d‘p=dT) and the susceptibility are found to have two peaks as a function of T for small quark masses. One of them is the chiral-induced peak associated with the rapid decrease of the chiral condensate. The other peak is almost independent of the quark mass or chemical potential, and it is interpreted as the ZNc -induced peak.

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