A. Zee, Quantum Field Theory in a Nutshell · Problem I.8.2

Field Theory Redux

Physics — QFT

Problem

Calculate ⟨k⃗∣H∣k⃗⟩\langle \vec{k}| H |\vec{k} \rangle, where ∣k⃗⟩=a†(k⃗)∣0⟩|\vec{k} \rangle = a^\dagger(\vec{k}) |0 \rangle.

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