Within the framework of Dyson-Schwinger equations (DSEs), we discuss the equation of state (EOS) and quark number densities of 2+1 flavors, that is to say, u, d, and s quarks. The chemical equilibrium and electric charge neutrality conditions are used to constrain the chemical potential of different quarks. The EOS in the cases of 2 flavors and 2+1 flavors are discussed, and the quark number densities, the pressure, and energy density per baryon are also studied. The results show that there is a critical chemical potential for each flavor of quark, at which the quark number density turns to nonzero from 0; and furthermore, the system with 2+1 flavors of quarks is more stable than that with 2 flavors in the system. These discussion may provide some useful information to some research fields, such as the studies related to the QCD phase transitions or compact stars.
@article{arxiv.1506.06846,
title = {2+1 flavors QCD equation of state at zero temperature within Dyson-Schwinger equations},
author = {Shu-Sheng Xu and Yan Yan and Zhu-Fang Cui and Hong-Shi Zong},
journal= {arXiv preprint arXiv:1506.06846},
year = {2016}
}