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, mu_B and mu_{iso}, 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 mu_{iso}=mu_B=0 but also mu_{iso}>0 and mu_B=0. In the mu_{iso}-mu_{B}-T space, where T is temperature, the critical endpoint of the chiral phase transition in the mu_B-T plane at mu_{iso}=0 moves to the tricritical point of the pion-superfluidity phase transition in the mu_{iso}-T plane at mu_B=0 as mu_{iso} increases. The thermodynamics at small T is controlled by sqrt{sigma^2+pi^2} defined by the chiral and pion condensates, sigma and pi.
Keywords
Cite
@article{arxiv.1005.0910,
title = {QCD phase diagram at finite baryon and isospin chemical potentials},
author = {Takahiro Sasaki and Yuji Sakai and Hiroaki Kouno and Masanobu Yahiro},
journal= {arXiv preprint arXiv:1005.0910},
year = {2010}
}
Comments
13 pages, 24 figures, published version, references added