For a particle in thermal bath, except for the logarithmic divergence in zero temperature, it also has a new infrared divergence ( linear divergence ) from finite temperature effect 當粒子處于熱浴環(huán)境時,由于溫度效應,除了零溫時的對數(shù)發(fā)散外,它還會有新的紅外發(fā)散(線性發(fā)散)。