Some more Feynman diagrams from quantum electrodynamics (QED), with squiggly lines representing photons and straight lines representing electrons or positrons (their anti-particle), depending upon which way you read the arrows. The process represents an entirely quantum process, with no classical counterpart, of light scattering off light. You can read the diagrams any way you like, running time in your chosen direction, and you’ll get a sensible story. For example two photons approach Continue reading ‘Boxes’
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