Born rule and Feynman propagators


by johne1618
Tags: born, feynman, propagators, rule
johne1618
johne1618 is online now
#1
Jan8-14, 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 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?
Phys.Org News Partner Physics news on Phys.org
Physicists design quantum switches which can be activated by single photons
'Dressed' laser aimed at clouds may be key to inducing rain, lightning
Higher-order nonlinear optical processes observed using the SACLA X-ray free-electron laser

Register to reply

Related Discussions
Feynman diagrams and relativistic propagators Quantum Physics 0
Feynman Propagators High Energy, Nuclear, Particle Physics 2
Feynman trick for linear propagators? High Energy, Nuclear, Particle Physics 1
MWI and Born Rule Quantum Physics 69
Why the Born Rule? Quantum Physics 5