翻訳と辞書 Words near each other ・ Supersatellite ・ Supersaturation ・ Supersaurus ・ Supersax ・ Superscalar processor ・ Superscan ・ Superscape ・ Supersci ・ Superscope ・ Superscope (song) ・ Superscripts and Subscripts ・ SuperSeaCat ・ Supersecondary structure ・ Supersedeas bond ・ Superseded scientific theories ・ Superselection ・ Supersemar ・ Supersense ・ Supersensitivity ・ Superserien ・ Supersessionism ・ Superset (disambiguation) ・ SuperSet Software ・ Supersexy Swingin' Sounds ・ Supershear earthquake ・ Supershit 666 ・ Supershitty to the Max! ・ Supershow ・ Supershow Nevada ・ SuperShuttle Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Superselection ： ウィキペディア英語版 Superselection In quantum mechanics, superselection extends the concept of selection rules. Superselection rules are postulated rules forbidding the preparation of quantum states that exhibit coherence between eigenstates of certain observables. It was originally introduced by Wick, Wightman, and Wigner to impose additional restrictions to quantum theory beyond those of selection rules. Mathematically speaking, two quantum states $\backslash psi\_1$ and $\backslash psi\_2$ are separated by a selection rule if $\backslash langle\; \backslash psi\_1\; |\; H\; |\; \backslash psi\_2\; \backslash rangle\; =\; 0$ for any given Hamiltonian $H$, while they are separated by a superselection rule if $\backslash langle\; \backslash psi\_1\; |\; A\; |\; \backslash psi\_2\; \backslash rangle\; =\; 0$ for ''all ''physical observables $A$. A superselection sector is a concept used in quantum mechanics when a representation of a *-algebra is decomposed into irreducible components. It formalizes the idea that not all self-adjoint operators are observables because the relative phase of a superposition of nonzero states from different irreducible components is not observable (the expectation values of the observables can't distinguish between them). ==Formulation== Suppose ''A'' is a unital *-algebra and ''O'' is a unital *-subalgebra whose self-adjoint elements correspond to observables. A unitary representation of ''O'' may be decomposed as the direct sum of irreducible unitary representations of ''O''. Each isotypic component in this decomposition is called a ''superselection sector''. Observables preserve the superselection sectors. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Superselection」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.