Student Friendly Introduction to QFT · Problem 7.8

QED: Quantum Field Interaction Theory Applied to Electromagnetism

Physics — QFT · interaction-picture-state-equation-of-motion

Problem

Start with the S.P. state equation of motion (top left box in Wholeness Chart 7-1) and use

U_0

to derive the I.P. state equation of motion (7-38). (Hint: Insert

I = U_0 U_0^\dagger

before the kets, express

H = \mathcal{H} = H_0 + H_I^S

, and pre-multiply the entire equation by

U_0^\dagger