利用实时格林函数方法，本文推广汤川势至有限温度和有限密度情况。
By means of the real time Green's function method, the yukawa potential is extended to finite temperature and finite density.
在闭合时间路径温度场论基础上，导出了直接计算推迟和超前格林函数的一种费曼规则。
Based on the closed time path formalism, a deduced Feynman rule for directly calculating the retarded and advanced Green functions is given.
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