Does it make sense to say that the processes represented by Feynman diagrams and path integrals (like beta decay) are “real?” If you want to say in what sense they are or are not real, please respond!
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But sometimes the momenta of the incoming asymptotic states are different from the momenta of the outgoing particles. Thus something must happen in-between which implies that, at least in some sense, interaction processes must be real too.
Which processes are you referring too? Conservation of momentum is one of the holiest of conservation laws! if there is kissing momentum that (I think) just means that some on shell particle (DM/neutrinos?) escaped without detection
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Ah no. I just meant that interactions do happen between particles. We can observe this because there are scattering processes p1p2->p3p4. We not only observe that two particles go in and two particles go out, but also that their momenta change. Hence interaction processes ∼ real
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ahh I see what you’re saying.. and that’s a good point! The fact that the momentum distribution is what we would expect from an interacting QFT .. You’re right, but I more so think that the sum over all interactions (the blob) is the ‘real’ physical thing
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“kissing” haha
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If there are Killing Vectors, why can't there be kissing momentum?
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