QED says, well, thanks to quantum or Feynman and Schwinger, they are exchanging virtual particles.
And that's the Feynman diagram.
And what you do is each time you write a Feynman diagram, each one of those lines in the Feynman
But the virtual particles typically refer to internal lines in the Feynman diagrams.
No, I'm just trying to figure out, like, how would you draw the Feynman diagram for just a point charge and its field?
So, you could imagine exactly as you're saying, you know, it's a four-point tree-level scattering Feynman diagram where you have two electrons going in, two electrons going out.
So, when you do that Feynman diagram and you're integrating over the momentum, you get this delta function from momentum conservation.
When you write down the Feynman diagrams, you can have what they call tree-level diagrams and then loop-level diagrams.
you have that Feynman vertex where you have an electron, positron and a photon, there's like