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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Vacuum manifold ： ウィキペディア英語版 Vacuum manifold In quantum field theory, the vacuum state may be degenerate. Each pure vacuum state generates its own superselection sector. The space of all pure vacuum states often has a manifold structure and is called the vacuum manifold. Vacuum manifolds arise during the process of spontaneous symmetry breaking from a group G to a subgroup H and the corresponding vacuum manifold has to be a realization of G and contain the quotient space G/H. In many cases, it would simply be G/H, although it could be larger. Not all vacuum manifolds arise due to spontaneous symmetry breaking. Supersymmetric models often contain moduli spaces which is another name for the vacuum manifold. In many cases, the vacuum manifold is parameterized by the values of permissible vacuum expectation values. This is not the case for spontaneous symmetry breaking due to fermion condensation, though. If the vacuum manifold is homotopically nontrivial, it's possible for there to be topological 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「Vacuum manifold」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.