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Extensions des modules de dimension finie pour les algèbres de courants tordues

Ce mémoire traite de la théorie des représentations d'une certaine classe d'algèbres de Lie de dimension infinie, les algèbres de courants tordues. L'objet du travail est d'obtenir une classification des blocs d'extensions d'une catégorie de modules de dimension finie pour une algèbre de courants tordue donnée. Les principales sources de cette étude sont les récentes classifications des modules simples de dimension finie pour ces algèbres et des blocs d'extensions pour les modules de dimension finie dans le cas des algèbres d'applications équivariantes. Ces algèbres de courants tordues comprennent entre autres les familles d'algèbres de Lie des formes tordues et des algèbres d'applications équivariantes, donc aussi les incontournables généralisations multilacets, tordues ou non, de la théorie de Kac-Moody affine. / / / / / This master's thesis is about the representation theory of a certain class of infinite dimensional Lie algebras, the twisted current algebras. The object of this work is to obtain a classification of the extension blocks of the category of finite dimensional modules for a given twisted current algebra. The principal motivations for this study are the recent classifications of simple finite dimensional modules for these algebras and of the extension blocks of the category of finite dimensional modules in the case of equivariant map algebras. The class of twisted current algebras includes, amongst others, the families of Lie algebras of twisted forms and equivariant map algebras, therefore the key multiloop generalisations, twisted or not, of the affine Kac-Moody setting.

preprint2015arXivOpen access

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