A Model-Independent Discussion of Quark Number Density and Quark Condensate at Zero Temperature and Finite Quark Chemical Potential  

作　　者：徐书生 蒋宇 史潮 崔著钫 宗红石 

机构地区：[1]Department of Physics, Nanjing University, Nanjing 210093 [2]Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004 [3]Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093 [4]State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190

出　　处：《Chinese Physics Letters》2015年第12期14-17,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11275097,11475085,11105122,and 11535005;the Jiangsu Planned Projects for Postdoctoral Research Funds under Grant No 1402006C

摘　　要：Generally speaking, the quark propagator is dependent on the quark chemical potential in the dense quantum chromodynamics （QCD）. By means of the generating functional method, we prove that the quark propagator actually depends on p4 ＋ iμ from the first principle of QCD. The relation between quark number density and quark condensate is discussed by analyzing their singularities. It is concluded that the quark number density has some singularities at certain # when T = 0, and the variations of the quark number density as well as the quark condensate are located at the same point. In other words, at a certain # the quark number density turns to nonzero, while the quark condensate begins to decrease from its vacuum value.Generally speaking, the quark propagator is dependent on the quark chemical potential in the dense quantum chromodynamics （QCD）. By means of the generating functional method, we prove that the quark propagator actually depends on p4 ＋ iμ from the first principle of QCD. The relation between quark number density and quark condensate is discussed by analyzing their singularities. It is concluded that the quark number density has some singularities at certain # when T = 0, and the variations of the quark number density as well as the quark condensate are located at the same point. In other words, at a certain # the quark number density turns to nonzero, while the quark condensate begins to decrease from its vacuum value.

关 键 词：QCD A Model-Independent Discussion of Quark Number Density and Quark Condensate at Zero Temperature and Finite Quark Chemical Potential 

分 类 号：O572.33[理学—粒子物理与原子核物理]