出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：QCD phase diagram is studied at finite temperature (T) and chemical potential (μ) in the strong
coupling lattice QCD including finite coupling (1/g2) effects for color SU(Nc). We find that there
appears a phase, where the chiral symmetry is weakly but spontaneously broken and the baryon
density is high, at Nc = 3 with one species of staggered fermions (Nf = 4). This phase may
correspond to the quarkyonic (QY) phase suggested at large Nc. The phase transition is found to
be the first and second order for the hadron (Nambu-Goldstone) to QY and QY to Wigner phase,
respectively. The QY phase appears as a result of interplay of two order parameters, the chiral
condensate and the repulsive vector field for quarks, the latter of which is found to appear from
the temporal plaquette and leads to the suppression of the effective chemical potential at high
densities.
