Sökning: "instantons"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet instantons.

  1. 1. Automorphic forms and string theory: Small automorphic representations and non-perturbative effects

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Henrik Gustafsson; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; instantons; automorphic forms; automorphic representations; Eisenstein series; U-duality; non-perturbative effects; string theory;

    Sammanfattning : This compilation thesis stems from a project with the purpose of determining non-perturbative contributions to scattering amplitudes in string theory carrying important information about instantons, black hole quantum states and M-theory. The scattering amplitudes are functions on the moduli space invariant under the discrete U-duality group and this invariance is one of the defining properties of an automorphic form. LÄS MER

  2. 2. Arithmetic and Hyperbolic Structures in String Theory

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Daniel Persson; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Instantons; Kac-Moody algebras; Spacelike singularities; String Theory;

    Sammanfattning : This thesis consists of an introductory text followed by two separate parts which may be read independently of each other. In Part I we analyze certain hyperbolic structures arising when studying gravity in the vicinity of spacelike singularities (the BKL-limit). LÄS MER

  3. 3. Aspects of Wrapped Branes in String and M-Theory

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Ling Bao; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Instantons; Algebraic symmetries; String theory;

    Sammanfattning : This thesis consists of an introductory text together with five appended research papers. The Ariadne's thread through the whole thesis is various effects coming from high-dimensional p-branes in various subsectors of string and M-theory. LÄS MER

  4. 4. Automorphic string amplitudes

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Henrik Gustafsson; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; U-duality; instantons; non-perturbative effects; Whittaker vectors; Eisenstein series; string theory; automorphic forms;

    Sammanfattning : This thesis explores the non-perturbative properties of higher derivative interactions appearing in the low-energy expansion of four-graviton scattering amplitudes in toroidal compactifications of type IIB string theory. We summarise the arguments for finding such higher derivative corrections in terms of automorphic forms using U-duality, supersymmetry and string perturbation theory. LÄS MER

  5. 5. D-instantons and Dualities in String Theory

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Christoffer Petersson; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis we study non-perturbative aspects of string theory. We focus our analysis on D-instanton effects which play key roles in the context of dualities, moduli stabilization and phenomenology. LÄS MER