Thanks for your reply Andrien. In fact I put as an example phi 4 scalar theory as it is super-renormalizable in 2 dimensions (1+1). I am aware that for example, in the massless case, when we go from n=4 to n=2, the above mentioned diagram divergence changes from ultraviolet to infrared. I just...
Hello everyone !
First of all, Quantum Field Theory is not my field of research. However, I have to investigate on some problems in QFT and I'm trying to get familiar with it again.
I'm basically working with scalar fields and I encounter some problems in dealing with renormalization...