Search for dissertations about: "Sigma Models"
Showing result 1  5 of 27 swedish dissertations containing the words Sigma Models.

1. Tensionless Strings and Supersymmetric Sigma Models : Aspects of the Target Space Geometry
Abstract : In this thesis, two aspects of string theory are discussed, tensionless strings and supersymmetric sigma models.The equivalent to a massless particle in string theory is a tensionless string. Even almost 30 years after it was first mentioned, it is still quite poorly understood. READ MORE

2. Twisting and Gluing : On Topological Field Theories, Sigma Models and Vertex Algebras
Abstract : This thesis consists of two parts, which can be read separately. In the first part we study aspects of topological field theories. We show how to topologically twist threedimensional N=2 supersymmetric ChernSimons theory using a contact structure on the underlying manifold. READ MORE

3. Going Round in Circles : From Sigma Models to Vertex Algebras and Back
Abstract : In this thesis, we investigate sigma models and algebraic structures emerging from a Hamiltonian description of their dynamics, both in a classical and in a quantum setup. More specifically, we derive the phase space structures together with the Hamiltonians for the bosonic twodimensional nonlinear sigma model, and also for the N=1 and N=2 supersymmetric models. READ MORE

4. The Complex World of Superstrings : On Semichiral Sigma Models and N=(4,4) Supersymmetry
Abstract : Nonlinear sigma models with extended supersymmetry have constrained target space geometries, and can serve as effective tools for investigating and constructing new geometries. Analyzing the geometrical and topological properties of sigma models is necessary to understand the underlying structures of string theory. READ MORE

5. Strings as Sigma Models and in the Tensionless Limit
Abstract : This thesis considers two different aspects of string theory, the tensionless limit of the string and supersymmetric sigma models with extended supersymmetry. First, the tensionless limit is used to find a IIB supergravity background generated by a tensionless string. The background has the characteristics of a gravitational shockwave. READ MORE