Student Friendly Introduction to QFT · Problem 9.8

The Vacuum Revisited

Physics — QFT · power-counting-fermion-loop-compton

Problem

For Prob. 7, pick one of the diagrams with a fermion loop for the incoming electron and show that the loop integral potentially diverges linearly with

k

for large

k

, where

k

is the four momentum of the photon propagator inside the loop.

Related theory

Power In Ac Circuits And Power Factor

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