Summary
A new realization of the loop algebra Ĝ (untwisted affine Kac-Moody algebra) is given on the enveloping field\(\bar \Omega \) of the Bose algebraK. By making use of this new realization nontrivial infinite-dimensional indecomposable representations and finite-dimensional representations ofĜ are constructed on\(\bar \Omega \) and its quotient spaces. Finally, as an explicit example, the loop algebra\(\widehat{SU}(2)\) associated with Lie algebraSU(2) is discussed in detail.
Riassunto
Si dà una nuova realizzazione dell’algebra ad ansaĜ (algebra di Kac-Moody affine non intrecciata) sul campo inviluppante\(\bar \Omega \) dell’algebra di BoseK. Usando questa nuova realizzazione si elaborano rappresentazioni non scomponibili a dimensioni infinite non triviali e rappresentazioni a dimensioni finite diĜ su\(\bar \Omega \) e i suoi spazi quozienti. Infine si discute in dettaglio, come esempio esplicito, l’algebra ad ans\(\widehat{SU}(2)\) associata all’algebra di LieSU(2).
Резюме
Предлагается новая реализация алгебры петельĜ (раскрученная аффинная алгебра Как-Муди) на огибающем поле\(\bar \Omega \) алгебры Бозе κ. Используя эту новую реализацию, конструируются нетривиальные бесконечномерные неприводимые представления и конечномерные представленияĜ на\(\bar \Omega \) иих частные пространства. В заключение, подробно обсуъдается пример алгебры петель\(\widehat{SU}(2)\), связанной с алгеброй ЛиSU(2).
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Sun, CP., Fu, HC. New realization of the loop algebras and their indecomposable modules. Nuov Cim B 105, 1–12 (1990). https://doi.org/10.1007/BF02723547
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DOI: https://doi.org/10.1007/BF02723547