Chemical Potential Dependence of Vertices  

作　　者：JIANG Yu ZHANG Yan-Bin SUN Wei-Min ZONG Hong-Shi 

机构地区：[1]Department of Physics, Nanjing University, Nanjing 210093, China [2]joint Center for Particle, Nuclear Physics and Cosmology, Nanjing 210093, China

出　　处：《Communications in Theoretical Physics》2008年第11期1193-1196,共4页理论物理通讯（英文版）

基　　金：supported in part by National Natural Science Foundation of China under Grant No.10575050;the Research Fund for the Doctoral Program of Higher Education under Grant No.20060284020

摘　　要：Based on the rainbow-ladder approximation of the Dyson-Schwinger equations and the assumption of the analyticity of the fermion-boson vertex in the neighborhood of zero chemical potential （μ = 0） and neglecting the #-dependence of the dressed gluon propagator, we apply the method in [Phys. Rev. C 71 （2005） 015205] of studying the dressed quark propagator at finite chemical potential to prove that the general fermion-boson vertex at finite μ can also be obtained from the one at μ = 0 by a simple shift of variables. Using this result we extend the results of [Phys. Lett. B 420 （1998） 267] to the situation of finite chemical potential and show that under the approximations we have taken, the Gell-Mann Oakes-Renner relation also holds at finite chemical potential

关 键 词：vertices at finite chemical potential 

分 类 号：O4[理学—物理]