结果表明零温场论中的红外发散和由温度效应引起的红外发散可以用描写虚过程的费曼图同时消除。
It turns out that both of the infrared divergence at the zero and finite temperature can be cancelled by the identical Feynman diagram of virtual processes.
对于一维电子系统来说费米液体理论也不是一个好的模型，因为当应用多体微扰讨论时有红外发散，使这种最常用的方法失效了。
But it's not a much appropriate model on one-dimensional systems because of infrared divergences when many-body pertebation theory is used, thus this normal solution failed.
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