Last Updated:2025/12/02

Wick's theorem allows us to reduce time-ordered products of field operators to sums of pairwise contractions, greatly simplifying perturbative calculations in quantum field theory.

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Wick's theorem allows us to reduce time-ordered products of field operators to sums of pairwise contractions, greatly simplifying perturbative calculations in quantum field theory.

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ウィックの定理は、任意の生成・消滅演算子の積を対の積の和に還元する手法であり、場の演算子の時間順序積を縮約の和として表現できるため、量子場理論における摂動計算を大幅に簡素化します。

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