23/02/15 22:59:24.71 IikyRbGC.net
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URLﾘﾝｸ(en.wikipedia.org)
Career in the United States
In 1949, Dyson demonstrated the equivalence of two formulations of quantum electrodynamics (QED): Richard Feynman's diagrams and the operator method developed by Julian Schwinger and Shin'ichir? Tomonaga. He was the first person after their creator to appreciate the power of Feynman diagrams and his paper written in 1948 and published in 1949 was the first to make use of them. He said in that paper that Feynman diagrams were not just a computational tool but a physical theory and developed rules for the diagrams that completely solved the renormalization problem. Dyson's paper and also his lectures presented Feynman's theories of QED in a form that other physicists could understand, facilitating the physics community's acceptance of Feynman's work. J. Robert Oppenheimer, in particular, was persuaded by Dyson that Feynman's new theory was as valid as Schwinger's and Tomonaga's. Also in 1949, in related work, Dyson invented the Dyson series. It was this paper that inspired John Ward to derive his celebrated Ward?Takahashi identity.[30]
URLﾘﾝｸ(ja.wikipedia.org)
繰り込み
歴史
詳細は「量子電磁力学#歴史」および「場の量子論#歴史」を参照
これを解決したのが、1943年朝永振一郎が創った相対論的に共変な場の量子論、超多時間論である。くりこみは超多時間論を基礎にして確立される。遅れること数年、ジュリアン・シュウィンガーは朝永と類似の形式、リチャード・ファインマンは経路積分(1948年)を形成し、朝永・シュウィンガー・ファインマンはくりこみ理論を建設する（フリーマン・ダイソンは3者の同等性を証明）。
量子色力学・ワインバーグ＝サラム理論を導く糸になる。この業績で、朝永振一郎、ジュリアン・シュウィンガーおよびリチャード・ファインマンはノーベル物理学賞を受ける
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