Jan8-14, 03:10 PM
Let us assume that we want to describe the full process of photon emission by electron A and absorption by electron B.
Therefore electron B must be on the forward lightcone of electron A.
In the normal forwards in time description a virtual photon propagates from A to B depositing a certain amount of energy and momentum onto electron B.
But does this process alone also describe the recoil of electron A?
Should one also include the backwards-in-time virtual photon which propagates from B to A depositing an equal amount of negative energy and momentum onto electron A?
One could say that the product of the forward-in-time and backward-in-time propagators give the full probability of photon emission by A and absorption by B.
Is this where the Born rule comes from?
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