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The Klein-Gordon Equation or the Klein-Fock-Gordon Equation is an equation in quantum field theory which initially was discovered by Schrodinger but discarded by him soon after.
13
votes
Accepted
Bessel function representation of spacelike KG propagator
This can be seen by partial integration
$$\frac{\partial}{\partial \rho}\sqrt{\rho^2-m^2}=\frac{\rho}{\sqrt{\rho^2-m^2}}$$
OP edit: More explicitly, we use this to write $(3)$ as
\begin{align}
D( …