Answer by Prof. Legolasov for Vacuum expectation value of time-ordered...
There's a difference between a source of the quantum field in the path integral formalism, and a current operator, despite of them being denoted by the same letter $J_{\mu}$. In this answer, $J_{\mu}$...
View ArticleVacuum expectation value of time-ordered functions in QED
I have been asked to take the Fourier transform of the two-point EM current function $$G_{\mu \nu}(x) = \langle \Omega \lvert T\{J_{\mu}(x) J_{\nu}(0) \} \rvert \Omega \rangle,$$ and to prove something...
View Article
More Pages to Explore .....
