Quantum electrodynamics
- QED is the relativistic quantum field theory of electrodynamics.
- It describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved.
- QED is based on the assumption that complex interactions of many electrons and photons can be represented by fitting together a suitable collection of the three basic building blocks and then using the probability amplitudes to calculate the probability of any such complex interaction.
- The basic idea of QED can be communicated while assuming that the square of the total of the probability amplitudes mentioned above acts just like our everyday probability.
- QED fails to explain why particles such as the electron have the masses they do.
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