Individual #quantum_electrodynamics__quantumelectrodynamic__QED  a relativistic quantum theory of the electromagnetic interactions of photons and electrons and muons
  >part of:  #quantum_field_theory__quantumfieldtheory  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
     >part of:  #quantum_physics  the branch of physics based on quantum theory
        >part of:  #physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions

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