Born rule and Feynman propagators

  1. 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?
    Last edited: Jan 9, 2014
  2. jcsd
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