- #1
ndung200790
- 519
- 0
Please teach me this:
It seem that the ultraviolet divergence has origin of we unknow the physics at very small distance(very large momentum,then very small distance).So we must cut off the very large momentum by renormalization procedure.But I do not understand the origin of infrared divergence in Feynman diagrams.By the way,it seem that in order to cut off infrared divergence,the general procedure is to put a small mass for the massless particles.
Thank you very much in advance.
It seem that the ultraviolet divergence has origin of we unknow the physics at very small distance(very large momentum,then very small distance).So we must cut off the very large momentum by renormalization procedure.But I do not understand the origin of infrared divergence in Feynman diagrams.By the way,it seem that in order to cut off infrared divergence,the general procedure is to put a small mass for the massless particles.
Thank you very much in advance.