Photons mediate electromagnetic force interactions from "summary" of The Quantum Theory of Fields by Steven Weinberg,Weinberg S
The electromagnetic force is one of the fundamental forces in nature, responsible for interactions between charged particles. According to quantum field theory, these interactions are mediated by particles known as gauge bosons. In the case of the electromagnetic force, the gauge boson is the photon. Photons are massless particles that travel at the speed of light. They carry the electromagnetic force between charged particles, such as electrons and protons. When two charged particles interact, they exchange photons, which transmit the electromagnetic force between them. The concept of photons mediating electromagnetic force interactions is crucial in understanding the behavior of charged particles in the quantum world. It explains how particles like electrons are able to repel or attract each other based on their electric charges. In quantum field theory, the electromagnetic force is described by the quantum electrodynamics (QED) theory, which treats photons as the carriers of the force. This theory has been extensively tested and confirmed by experiments, showing the accuracy of the concept of photons mediating electromagnetic interactions.- The idea that photons mediate electromagnetic force interactions provides a theoretical framework for understanding the behavior of charged particles at the quantum level. It is a fundamental concept in modern physics that has been supported by experimental evidence and plays a key role in our understanding of the universe.
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