Quantum Electrodynamics (QED) explained - Brian Cox - Quantum theory of light

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Quantum Electrodynamics (QED) is a theory that describes the interactions between charged particles and electromagnetic fields. It explains how charged particles like electrons interact with electromagnetic fields, which includes phenomena like the emission and absorption of light, as well as the scattering of charged particles.

In QED, particles interact through the exchange of virtual photons, which are particles of light that are not directly observable but play a crucial role in the interactions. The theory is based on the idea of gauge invariance, which means that the theory should be invariant under local transformations of the electromagnetic field.

QED has been one of the most successful theories in physics, with predictions that have been confirmed by experiments to an incredibly high degree of accuracy. It is used in many areas of physics, including condensed matter physics and particle physics, and has played a key role in the development of other quantum field theories.


JR

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