Quantum field theory is the theoretical framework that unites quantum mechanics with special relativity, treating particles as excitations of underlying fields that permeate space rather than as isolated point objects. Its development through the twentieth century, beginning with the quantization of the electromagnetic field and culminating in quantum electrodynamics refined by Richard Feynman, Julian Schwinger and Sin-Itiro Tomonaga in the late 1940s, produced predictions confirmed to extraordinary precision, including the electron's magnetic moment. The framework underlies the Standard Model of particle physics, describing the electromagnetic, weak and strong forces through their own respective quantum fields.
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