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Fermi's golden rule : ウィキペディア英語版 | Fermi's golden rule In quantum physics, Fermi's golden rule is a simple formula for the ''constant'' transition rate (probability of transition per unit time) from one energy eigenstate of a quantum system into other energy eigenstates in a continuum, effected by a perturbation. This rate is effectively constant. ==General== Although named after Enrico Fermi, most of the work leading to the Golden Rule is due to Paul Dirac who formulated 20 years earlier a virtually identical equation, including the three components of a constant, the matrix element of the perturbation and an energy difference.〔(【引用サイトリンク】author=Taco D. Visser )〕〔 See equations (24) and (32).〕 It was given this name because, on account of its importance, Fermi dubbed it "Golden Rule No. 2." 〔, formula VIII.2〕
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