- Can anyone explain this in layman's words?
I'm new to QED, so I want to have a general grasp of what's going on. I just want to understand it conceptually. Can anyone explain it in a way so a layman can understand?
Yes, (if I remember correctly) the probability of a route is the square of the sum of the amplitudes of all possible routesAs an extension question,
I read parts of the QED lecture. It said that light can take an infinitely different route, but some routes are more likely for light to take.
It is also a sum of amplitudes but the lines on Feyman diagrams are not routes. The diagram shows all the ways in which given initial states can become (proposed ) output states. To calculate the probability of this one must sum the amplitudes for all the ways over all space. It is very technical as this paper ( 'Feynman diagrams for beginners') shows. The diagram that you think is an electron anihilating with a being deflected is not that. It is probably an electron anihilating with a positron.My question is that how does that idea relate to the Feynman diagrams (where 2 electrons deflect off each other because of a photon)
It said that light can take an infinitely different route, but some routes are more likely for light to take. My question is that how does that idea relate to the Feynman diagrams (where 2 electrons deflect off each other because of a photon)
What's the mechanism behind how an electron emits (or absorbs) a photon? How does that work?
Do electrons just go off an emit photons randomly? Or only when a circumstance happens? Is there a pattern to it?
We don't measure electrons emitting single photons. The "electron emits a photon" process is a virtual process; it's part of the theoretical model shown in Feynman diagrams. It's not something we directly measure.
how did Feynman arrive at "electron emits a virtual photon?"
it carries momentum which causes electrons to recoil and deflect off each other.
Coming back to the basic scenario of two electrons shot at each other and bounce off. That is what the most basic Feynman diagram represents I think.
In quantum physics, those electric field supposedly are made of individual discrete photons (i think).
In the 2nd chapter, it talks about light and how it is most likely to take the path of least time required to travel
If any of that information relevant to the electron situation I mentioned above?