Advanced Quantum Mechanics Schwabl · Problem 13.17

Quantization of the Radiation Field

Physics — Quantum Mechanics · propagator-klein-gordon-equation

Problem

Show that ΔF(x)\Delta_F(x), ΔR(x)\Delta_R(x), and ΔA(x)\Delta_A(x) satisfy the inhomogeneous Klein–Gordon equation (∂μ∂μ+m2)ΔF(x)=−δ(4)(x) .(\partial_\mu\partial^\mu + m^2)\Delta_F(x) = -\delta^{(4)}(x)\,.

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