摘要
在研究多粒子体系问题时，采用包含有最重要物理信息的格林函数描述，但格林函数并不比波函数容易确定，通常用费曼规则和费曼图解这种简明而又系统的语言可将它表述出来．本文用这些规则给出自旋Ｓ＝１／２时的费米均匀体系在Ｔ≠０时二阶自能，并完成对频率求和后的表达式．
n general, Green function including the important physics information is used for researching polyparticle system. Defining Green function is not easy to define a wave function. For this reason, Polyparticle system should be expressed by the simple and systematic method Feynman rule and diagram. In this paper, the second order self energy of harmonious Fermi system with S =1/2 at T ≠0 is calculated with this rule, and an expression of sum for frequency also is obtained.
出处
《沈阳化工学院学报》
1997年第4期295-297,共3页
Journal of Shenyang Institute of Chemical Technolgy
