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本文利用闭路Green函数理论讨论了有限温度场论单粒子不可约(1PI)图形的零动量行为,并且证明在体现Kubo-Martin-Schwinser条件的“│P0│方案”下,这种图形的推迟函数的零动量极限是完全确定的。By using the closed time-path Green's function method, we investigate the zero momentum behavior of one particle irreducible diagrams for quantum field theory at finite temperature. It is shown that the zero momentum limits of the retarded form of these diagrams are no longer ambiguous provided that the "|p0| prescription", which implies the Kubo-Martin-Schwinger condition, is adopted.
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