Search for dissertations about: "reggeon vertices"

Found 5 swedish dissertations containing the words reggeon vertices.

  2. 1. Vertex Operators, String Vertices and Conformal Field Theory Deformations

    Author : Per Sundell; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; conformal field theory; vertex operator; Riemann surface; supersymmetry; Reggeon; string theory; sewing;

    Abstract : We compute multi-string interaction vertices by sewing of basic string interaction vertex operators, so called dual Reggeon vertex operators. These operators describe the interaction between two complete external string sectors. They are particularly useful when the interactions involve twisted sectors. READ MORE

  4. 2. Sewing of twisted and untwisted reggeon vertices

    Author : R. Niclas Engberg; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NSR string; Reggeons; vertex operator; strings; twisted scalars;

    Abstract : .... READ MORE

  5. 3. Strings, Branes and Symmetries

    Author : Anders Westerberg; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lie-algebra cohomology; Reggeon vertices; extended objects; string theory; p -branes; current algebra; supersymmetry; sewing; pseudodifferential operators; D-branes;

    Abstract : Recent dramatic progress in the understanding of the non-perturbative structure of superstring theory shows that extended objects of various kinds, collectively referred to as p-branes, are an integral part of the theory. In this thesis, comprising an introductory text divided in two parts and seven appended research papers (Papers I-VII), we study various aspects of p-branes with relevance for superstring theory. READ MORE

  6. 4. Bosonic string field theory : operator formulation and string field functional formulation

    Author : Per Sundell; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; string field theory; BRST-invariance; modular invariance; reggeon vertices; master equation; homotopy Lie algebras; sweing of riemann surfaces;

    Abstract : .... READ MORE

  7. 5. Loops, Twists and String Vertices: The Sewing Approach to String Perturbation Theory

    Author : R. Niclas Engberg; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : String theory provides the most promising candidate for a unified theory of all fundamental forces and a consistent quantum mechanical theory of gravity. String theory is, at present, defined through its perturbation expansion. There exists various methods for treating the string diagrams one of which is through the sewing of Reggeon vertices. READ MORE