
#1
Jan814, 03:10 PM

P: 355

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 backwardsintime 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 forwardintime and backwardintime 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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