Münster 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 56: Schwerionenkollisionen und QCD Phasen VII
HK 56.2: Vortrag
Donnerstag, 24. März 2011, 17:00–17:15, HS AP
Nonlocal PNJL model and imaginary chemical ptoential — •Kouji Kashiwa1,2, Thomas Hell2, and Wolfram Weise2 — 1Kyushu University, Fukuoka, Japan — 2Technische Universität München, Garching, Germany
In order to get constraints for the modeling of the QCD phase diagram at real chemical potential (µR), we investigate the phase structure of two-flavor QCD at finite imaginary chemical potential (µI) and temperature (T) using the nonlocal Polyakov-loop extended Nambu–Jona-Lasinio (PNJL) model including quark wave function renormalization. We show that this nonlocal PNJL model reproduces characteristic properties of QCD such as the Roberge-Weiss (RW) periodicity and the RW transition at finite θ=µI/T. To reproduce lattice QCD data of crossover lines for the chiral and deconfinement transitions near θ=π/3, we introduce additional local and nonlocal vector-type four-quark interactions in this model. These interactions have strong influences on the thermodynamics at moderate and high µR. Details of wave function renormalization do not affect the crossover lines, but have a significant impact on the determination of the strength of the nonlocal vector-type four-quark interaction. This work is supported by the Japan Society for the Promotion of Science for Young Scientists, by BMFT and by DFG Excellence Cluster “Origin and Structure of the Universe”.