What is quantum field theory and why was it developed?

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Quantum field theory (QFT) is a framework where fields are the primary variables, and particles are viewed as quanta of these fields. It was developed in the mid-20th century, notably through quantum electrodynamics (QED), to address phenomena like the Lamb shift observed in hydrogen spectra. The theory involves complex mathematical structures, including distributions and functionals, which differ significantly from traditional particle theories. Key developments in QFT include the unification of electromagnetic and weak forces into the electroweak theory and the formulation of quantum chromodynamics (QCD) for the strong force, culminating in the Standard Model of particle physics. Overall, QFT has become essential for understanding high-energy physics and the fundamental interactions of particles.
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selfAdjoint said:
No it doesn't. It is possible, if not necessary, to think of virtual particles as just mathematical terms in a power series, with no physical reality at all. Even the Casimir effect, which seems to show their reality, can be explained as an interaction with the plates.
i wonder what on Earth you were talking about before, silly
 

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