- #1
blackie1008
- 5
- 0
Hi,
I have been looking at the renormalisation of QED and been using Peskin & Schroeder. I understand (I think) what is going on, but I am slightly confused over 2 issues:
1. In the new feynman rules from the counterterms, the feynman diagrams all have a small circle with a cross in them...what do these represent? (P&S p332, fig 10.4)
2. why do we need the renormalization conditions? (P&S p331-331 eq 10.40)
Help would be much appreciated!
Thanks
I have been looking at the renormalisation of QED and been using Peskin & Schroeder. I understand (I think) what is going on, but I am slightly confused over 2 issues:
1. In the new feynman rules from the counterterms, the feynman diagrams all have a small circle with a cross in them...what do these represent? (P&S p332, fig 10.4)
2. why do we need the renormalization conditions? (P&S p331-331 eq 10.40)
Help would be much appreciated!
Thanks