Search for dissertations about: "STRING FIELD-THEORY"

Showing result 1 - 5 of 42 swedish dissertations containing the words STRING FIELD-THEORY.

  2. 1. Defects, renormalization and conformal field theory

    Author : Alexander Söderberg Rousu; Agnese Bissi; Pedro Liendo; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; defects; boundaries; replica twist defect; conformal field theory; quantum field theory; Coleman-Weinberg mechanism; renormalization group flows; Theoretical Physics; Teoretisk fysik;

    Abstract : Defects in quantum field theories appear in many different contexts and are of great physical interest. Among other things, defects are used to describe the Kondō effect in condensed matter, confinement in quantum chromodynamics, Rényi entropy in quantum information and cosmic strings in string theory. READ MORE

  4. 2. Conformal Field Theory and D-branes

    Author : Albrecht Wurtz; Jürgen Fuchs; Bert Schellekens; Karlstads universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; String theory; Conformal field theory; Vertex algebras; D-branes; Physics; Fysik; Physics; Fysik;

    Abstract : The main topic of this doctoral thesis is D-branes in string theory, expressed in the language of conformal field theory. The purpose of string theory is to describe the elementary particles and the fundamental interactions of nature, including gravitation as a quantum theory. READ MORE

  5. 3. Strings, Conformal Field Theory and Noncommutative Geometry

    Author : Keizo Matsubara; Anton Alekseev; Edwin Langmann; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; Theoretical physics; String theory; Conformal field theory; Noncommutative geometry; Star-products; Teoretisk fysik; Physics; Fysik;

    Abstract : This thesis describes some aspects of noncommutative geometry and conformal field theory. The motivation for the investigations made comes to a large extent from string theory. This theory is today considered to be the most promising way to find a solution to the problem of unifying the four fundamental interactions in one single theory. READ MORE

  6. 4. 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

  7. 5. 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