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A SIMPLE STRATEGY FOR RENORMALIZATION: QED AT ONE-LOOP LEVEL

2010; World Scientific; Volume: 25; Issue: 22 Linguagem: Inglês

10.1142/s0217751x10050329

1793-656X

Ji-Feng Yang, Zhaoting Pan,

Cosmology and Gravitation Theories

We demonstrate our simple strategy for renormalization with QED at one-loop level, basing on an elaboration of the effective field theory philosophy. No artificial regularization or deformation of the original theory is introduced here and hence no manipulation of infinities, ambiguities arise instead of infinities. Ward identities first come to reduce the number of ambiguities, the residual ones could in principle be removed by imposing physical boundary conditions. Renormalization group equations arise as "decoupling theorems" in the underlying theory perspective. In addition, a technical theorem concerning routing of external momenta is also presented and illustrated with the self-energy and vertex function as examples.