This textbook delivers a course in quantum electrodynamics introducing relativistic quantum field theory it uses the concepts of the schrdinger equation dirac notation the harmonic oscillator and the hydrogen atom in a structure organized around topics in waves particles and interactions. In his seminal 1927 paper the quantum theory of the emission and absorption of radiation dirac coined the term quantum electrodynamics qed a theory that adds upon the terms describing the free electromagnetic field an additional interaction term between electric current density and the electromagnetic vector potential. Quantum electrodynamics is the modern theory of electricity magnetism and light the use of feynman diagrams to describe particle interactions started here. Quantum electrodynamics qed quantum field theory of the interactions of charged particles with the electromagnetic fieldit describes mathematically not only all interactions of light with matter but also those of charged particles with one another qed is a relativistic theory in that albert einsteins theory of special relativity is built into each of its equations
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