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Pants
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In QED, Feynman talks about P(A to B), the probability that a photon starting at a particular point in space will travel to a different point in space (I've since learned that P(A to B) is actually the Feynman propagator, unless I was midled).
What I'm wondering is - what happens if there are multiple photons? Taking the simplest case with two photons interacting, do things like photons turning into particle-antiparticle pairs need to be taken into account?
Thanks!
-Vince
What I'm wondering is - what happens if there are multiple photons? Taking the simplest case with two photons interacting, do things like photons turning into particle-antiparticle pairs need to be taken into account?
Thanks!
-Vince