Srednicki — Quantum Field Theory · Problem 62.1

Canonical Quantization of Scalar Fields — Mark Srednicki

Physics — QFT · gauge-fixing-photon-propagator

Problem

Show that adding a gauge fixing term −12ξ−1(∂μAμ)2-\tfrac{1}{2}\xi^{-1}(\partial^\mu A_\mu)^2 to L\mathcal{L} results in eq. (62.9) as the photon propagator. Explain why ξ=0\xi=0 corresponds to Lorenz gauge, ∂μAμ=0\partial^\mu A_\mu = 0.

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