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Found 2 swedish dissertations matching the above criteria.

2. 1. Group Extensions, Gerbes and Twisted K-theory

   Author : Pedram Hekmati; Jouko Mickelsson; Jürgen Fuchs; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematical physics; Matematisk fysik;

   Abstract : This thesis reviews the theory of group extensions, gerbes and twisted K-theory. Application to anomalies in gauge theory is briefly discussed. The main results are presented in two appended scientific papers. READ MORE

4. 2. On Vertex Operator Algebras of Affine Type at Admissible Levels

   Author : Thomas Edlund; Matematik (naturvetenskapliga fakulteten); []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Vertex operator algebras; Kac-Moody algebras; Ore localization; Admissible levels; Singular vectors; Intertwining operators;

   Abstract : The main purpose of this thesis is the study of the structure and representation theory of simple vertex operator algebras (VOAs) of affine type at admissible levels. To do this, it is crucial to obtain knowledge of the singular vectors which generate the maximal submodules, with respect to which these VOAs appear as irreducible quotients, and therefore a substantial part of the text is devoted to this matter. READ MORE