A. Zee, Quantum Field Theory in a Nutshell · Problem I.8.3

Field Theory Redux

Physics — QFT

Problem

For the complex scalar field discussed in the text calculate ⟨0∣T[φ(x)φ†(0)]∣0⟩\langle 0| T [\varphi(x)\varphi^\dagger(0)]|0 \rangle.

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