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FAQs
What is Wick expansion?
Wick expansion rewrites operator products into normal-ordered terms plus contractions.
How do Feynman diagrams help?
They visually represent particle interactions, simplifying complex quantum calculations.
What role does gauge symmetry play?
Gauge symmetry ensures conservation laws and dictates interactions of gauge bosons in quantum fields.
It sums over all possible histories to calculate quantum amplitudes.
Explain path integral quantization.
What is Goldstone's theorem?
It predicts massless bosons when continuous symmetries break spontaneously.