The Roberge-Weiss (RW) phase transition in the imaginary chemical potential region is analyzed by the Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. In the RW phase transition, the charge-conjugation symmetry is spontaneously broken, while the extended Z3 symmetry (the RW periodicity) is preserved. The RW transition is of second order at the endpoint. At the zero chemical potential, a crossover deconfinement transition appears as a remnant of the second-order RW phase transition at the endpoint, while the charge-conjugation symmetry is always preserved.
@article{arxiv.0904.0925,
title = {Roberge-Weiss phase transition and its endpoint},
author = {Hiroaki Kouno and Yuji Sakai and Kouji Kashiwa and Masanobu Yahiro},
journal= {arXiv preprint arXiv:0904.0925},
year = {2010}
}
Comments
24 pages, 19 figures. Journal version. Some sentences have been revised and added. Fig. 9 has been revised. (New panels have been added.)