QCD phase diagram at finite baryon and isospin chemical potentials
Abstract
The phase structure of two-flavor QCD is explored for thermal systems with finite baryon- and isospin-chemical potentials, muB and muiso, by using the Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. The PNJL model with the scalar-type eight-quark interaction can reproduce lattice QCD data at not only muiso=muB=0 but also muiso>0 and muB=0. In the muiso-muB-T space, where T is temperature, the critical endpoint of the chiral phase transition in the muB-T plane at muiso=0 moves to the tricritical point of the pion-superfluidity phase transition in the muiso-T plane at muB=0 as muiso increases. The thermodynamics at small T is controlled by sqrtsigma2+pi2 defined by the chiral and pion condensates, sigma and pi.
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