## Restoration of chiral symmetry in a model with dynamical spontaneous symmetry breaking at finite temperature and density

The chiral-symmetry-restoring transition in a model proposed by Lurie is investigated at finite temperature and density. A method is given to establish the self-consistency equation satisfied by the order parameter and a convenient scheme is constructed for calculating the equation of state approximately. Study of the phase diagram shows the existence of a critical point separating the first-order from the second-order chiral phase transition. By calculating the energy density versus temperature, the order of the chiral phase transition is confirmed. A careful analysis of isotherms of pressure versus net baryon-number density suggests the existence of overheated and overcooled metastable statesmore »