Nonlocal Polyakov-Nambu-Jona-Lasinio model and imaginary chemical potential

作者：Kashiwa Kouji^*; Hell Thomas; Weise Wolfram

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, 84(5): 056010.

DOI：10.1103/PhysRevD.84.056010

With the aim of setting constraints for the modeling of the QCD phase diagram, the phase structure of the two-flavor Polyakov-loop-extended Nambu and Jona-Lasinio (PNJL) model is investigated in the range of imaginary chemical potentials (mu(I)) and compared with available N-f = 2 lattice QCD results. The calculations are performed using the advanced nonlocal version of the PNJL model with the inclusion of vector-type quasiparticle interactions between quarks, and with wave-function-renormalization corrections. It is demonstrated that the nonlocal PNJL model reproduces important features of QCD at finite mu(I), such as the Roberge-Weiss (RW) periodicity and the RW transition. Chiral and deconfinement transition temperatures for N-f = 2 turn out to coincide both at zero chemical potential and at finite mu(I). Detailed studies are performed concerning the RW endpoint and its neighborhood where a first-order transition occurs.

• 出版日期2011-9-21