| NOUN | cognition | quantum field theory | the branch of quantum physics that is concerned with the theory of fields |
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| Meaning | The branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states. | |
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| Narrower | quantum chromodynamics, QCD | A theory of strong interactions between elementary particles (including the interaction that binds protons and neutrons in the nucleus) |
| quantum electrodynamics, QED | A relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons | |
| Broader | quantum physics | The branch of physics based on quantum theory |
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