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. Quantum mechanics is the science of the very small it explains the behavior of matter and its interactions with energy on the scale of atoms and subatomic particlesby contrast classical physics only explains matter and energy on a scale familiar to human experience including the behavior of astronomical bodies such as the moon classical physics is still used in much of modern science and . 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. Quantum electrodynamics is the modern theory of electricity magnetism and light the use of feynman diagrams to describe particle interactions started here
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