Pressure and Spectral Density of Fermions at Finite Temperature  

作　　者：HOU De-fu U.Heinz LI Jia-rong 侯德富;U.Heinz;李家荣(Institute of Particle Physics,Huazhong Normal University,Wuhan 430079;Institut fur Theoretische Physik,Universitat Regensburg,D-93040 Regensburg,Germany)

机构地区：[1]Institute of Particle Physics,Huazhong Normal University,Wuhan 430079 [2]Institut fur Theoretische Physik,Universitat Regensburg,D-93040 Regensburg,Germany

出　　处：《Chinese Physics Letters》1999年第10期709-711,共3页中国物理快报（英文版）

基　　金：Supported by the Deutsche Forschungsgemeinschaft(DFG);the Bundesministerium fur Bildung und Forschung(BMBF);the National Natural Science Foundation of China under Grant No.19775017;the Gesellschaft fur Schwerionenforschung(GSI).

摘　　要：The pressure of a fermion system is expressed as a mass integral over the full two-point spectral densities within the real time formalism by use of the Keldysh representation for the propagators.This simpliSes the calculation significantly and allows a Dyson resummation.The expression is used to demonstrate that potential infrared divergences are rendered harmless.We apply it to check the pressures of an ideal fermion gas and of a chemically non-equilibrated quantum chromodynamics plasma.

关 键 词：FERMI apply RENDER 

分 类 号：O57[理学—粒子物理与原子核物理]