Answer by Hyperon for Feynman propagator as a sum over eigenfunctions
We start from the defining equation$$ (m^2+ \square_x -i \epsilon) G(x-x^\prime)=\delta^{(d)}(x-x^\prime) \tag{1} \label{1}$$ of the Green function of the Klein-Gordon operator in $d$ dimensions with...
View ArticleFeynman propagator as a sum over eigenfunctions
I often read something like "the Feynman propagator is the Green's function of the Klein-Gordon equation", so I try to write it as a sum over eigenfunctions, as should be possible for any Green's...
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