Ask Ethan: How do photons mediate both attraction and repulsion? | by Ethan Siegel | Starts With A Bang! | Jan, 2025
Today, Feynman diagrams are used in calculating every fundamental interaction spanning the strong, weak, and electromagnetic forces, including in high-energy and low-temperature/condensed conditions. The electromagnetic interactions, shown here, are all governed by a single force-carrying particle: the photon, and can...