New posts in Propagator

Why can you deform the contour in the integral expression for the Klein-Gordon propagator to get the Euclidean propagator?

Inverse Square Law in $D$ dimensions (two cases)

Propagator Correction in $\phi^4$ theory - why doesn't this secular growth break perturbation theory?

Why do the counterterms in renormalized $\phi^4$-theory with power two in fields give vertices and not propagators?

What actually means to compute things at tree level?

Actually calculating something using Wick's Theorem

Why does the branch cut of the self-energy begin at $2m$?

An integral in Peskin's Quantum Field Theory P. 27

How to interpret correlation functions in QFT?

The analytical result for free massless fermion propagator