Abstract
Charge conjugation () and parity () are exact symmetries at and , where is the parameter of the so-called vacuum, is the imaginary quark-number chemical potential and is the temperature. Spontaneous breakings of these discrete symmetries are investigated by the Polyakov-loop extended Nambu–Jona-Lasinio model. At zero , symmetry is spontaneously broken while symmetry is conserved. As increases, symmetry is restored just after symmetry is spontaneously broken, so that either or symmetry or both the symmetries are spontaneously broken for any . The chiral-symmetry restoration and the deconfinement transition at are remnants of the restoration and the breaking at , respectively.
6 More- Received 3 February 2011
DOI:https://doi.org/10.1103/PhysRevD.83.076009
© 2011 American Physical Society