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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 Four-fermion interactions ： ウィキペディア英語版 Four-fermion interactions In quantum field theory, fermions are described by anticommuting spinor fields. A four-fermion interaction describes a local interaction between four fermionic fields at a point. Local here means that it all happens at the same spacetime point. This might be an effective field theory or it might be fundamental. Some examples are the following: *Fermi's theory of the weak interaction. The interaction term has a V-A (vector minus axial) form. *The Gross-Neveu model. This is a four-fermi theory of Dirac fermions without chiral symmetry and as such, it may or may not be massive. *The Thirring model. This is a four-fermi theory of fermions with a vector coupling. *The Nambu-Jona-Lasinio model. This is a four-fermi theory of Dirac fermions with chiral symmetry and as such, it has no bare mass. A nonrelativistic example is the BCS theory at large length scales with the phonons integrated out so that the force between two dressed electrons is approximated by a contact term. In four space-time dimensions, such theories are not renormalisable. 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「Four-fermion interactions」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.