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Results tagged with feynman-diagrams
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user 251538
A diagrammatic technique introduced by Richard Feynman to describe the quantum behaviour of subatomic particles and their interactions. Do not use for general questions on diagrams that are not of the Feynman kind.
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LSZ reduction formula valid for any type of observables?
P&S on page 213 arrive at the following identity for the two-point function (eq. 7.5)
$$\langle \Omega|\phi(x)\phi(y)|\Omega\rangle={\sum_{\lambda} \int \dfrac{d^4p}{(2\pi)^4}\dfrac{ie^{-ip.(x-y)}}{p^ …
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