Quantum electrodynamics explains lightmatter interactions from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
Quantum electrodynamics is the theory that describes how light and matter interact with each other. This theory is based on the principles of quantum mechanics and special relativity, and it has been incredibly successful in explaining a wide range of phenomena, from the behavior of atoms to the interactions between particles in particle accelerators. One of the key ideas in quantum electrodynamics is that particles can interact with each other by exchanging virtual particles. These virtual particles are not like the particles we are familiar with, such as electrons or photons; instead, they are quantum fluctuations in the electromagnetic field that mediates the interactions between charged particles. When two charged particles interact, they exchange vi...
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