I have been told before that virtual particles are just an artefact of perturbation theory, that if we could solve interacting fields exactly we would have no need to talk about virtual particles at all. My question then is if virtual particles are just a mathematical tool to evaluate perturbation series and don't really exist, how do particles actually interact with each other? For example, the electron electron photon vertex is not allowed due to momentum conservation, so how can the electron interact with other charged objects if it cannot emit a photon?(adsbygoogle = window.adsbygoogle || []).push({});

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# Virtual particles and perturbation theory

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