Quantum electrodynamics: theory
Why Physics Stack Exchange recommends it
Physics Stack Exchange users link it when explaining Feynman diagrams, photon exchange, and how renormalization tames infinities in QED calculations.
Recommended by 2 people across 2 different months, 2016 to 2021.
What it is
A seven-minute explainer from Fermilab in which physicist Don Lincoln describes how theoretical calculations are done in quantum electrodynamics (QED), the most precise component of the Standard Model. It uses Feynman diagrams and links to companion videos in the series.
What people said
Recommends QuantumDoge · 2016-04 · Physics Stack Exchange · on “What does it mean by "infinities" when dealing with QFT?”
First I would recommend you to check this video: [this video] The video mentions Renormalization in the context of one-loop Feynman Diagrams. In slide 14 (check slide 12 for a picture) of [LINK] you can check an example of an infinity (a divergent integral), and also the solution to avoid it. Don't mind if you don't understand most of it, just focus on the mechanism, this is renormalization in action. This is only possible because we work with gauge theories, which construct interactions based on internal simmetries. Discovering that all gauge theories are renormalizable was a great achievement, check Veltman and t'Hooft wikipedia pages for more info. If you don't understand what I meant by "whic
Recommends mmesser314 · 2021-03 · Physics Stack Exchange · on “On the interpretation of Feynman diagrams”
You might also look at Theoretical physics: insider's tricks [LINK] (which is about perturbation theory), and Quantum electrodynamics: theory [this video]
Cites Gabe12 · 2016-10 · Physics Stack Exchange · on “Do positively charged particles exchange photons?”
I learned in this video [this video] and in this answer [LINK] that electrons repel from each other by exchanging photons. This makes sense when it comes to electrons, but what happens when two protons or two positrons repel each other? Do positively charged particles also exchange photons?