Color neutrality effects in the phase diagram of the PNJL model
Abstract
The phase diagram of a two-flavor Polyakov loop Nambu-Jona-Lasinio model is analyzed imposing the constraint of color charge neutrality. Main effects of this constraint are a shrinking of the chiral symmetry breaking (chiSB) domain in the T-mu plane, a shift of the critical point to lower temperatures and a coexistence of chiSB and two-flavor superconducting phases. The effects can be understood in view of the presence of a nonvanishing color chemical potential mu8, which is necessary to compensate the color charge density rho8 induced by the nonvanishing Polyakov-loop mean field phi3.
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