Sökning: "string"

Visar resultat 1 - 5 av 166 avhandlingar innehållade ordet string.

  1. 1. Holographic Wilson Loops Quantum String Corrections

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Daniel Ricardo Medina Rincon; Konstantin Zarembo; Gianluca Grignani​; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Gauge-string correspondence; AdS CFT; Wilson loops; String theory; Theoretical Physics; Teoretisk fysik;

    Sammanfattning : The gauge-string duality has been one of the most exciting areas in theoretical physics as it connects strongly coupled field theories with weakly interacting strings. The present thesis concerns the study of Wilson loops in this correspondence. LÄS MER

  2. 2. Torn, Spun and Chopped Various Limits of String Theory

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Fredric Kristiansson; Uppsala universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; Theoretical physics; String theory; D-branes; Non-commutative open string theory; AdS CFT; Higher spin gauge theory; BMN; String bits; Fermion doubling; Teoretisk fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : For the first time in the history of physics we stand in front of a theory that might actually serve as a unification of it all - string theory. It provides a self-consistent framework for gravity and quantum mechanics, which naturally incorporates matter and gauge interactions of the type seen in the standard model. LÄS MER

  3. 3. On string integrability A journey through the two-dimensional hidden symmetries in the AdS/CFT dualities

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Valentina Giangreco Marotta Puletti; Konstantin Zarembo; Gleb Arutyunov; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; String Theory; AdS-CFT correspondence; Integrable Field theory; Sigma models; S-matrix; Factorized Scattering; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; NATURAL SCIENCES Physics Other physics Mathematical physics; NATURVETENSKAP Fysik Övrig fysik Matematisk fysik; Theoretical Physics; teoretisk fysik;

    Sammanfattning : One of the main topics in the modern String Theory are the conjectured string/gauge (AdS/CFT) dualities. Proving such conjectures is extremely difficult since the gauge and string theory perturbative regimes do not overlap. In this perspective, the discovery of infinitely many conserved charges, i.e. LÄS MER

  4. 4. Automorphic string amplitudes

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    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. The bowed string

    Detta är en avhandling från Institutionen för talöverföring och musikakustik

    Författare :Knut Guettler; [2002]
    Nyckelord :Bowed string; violin; musical acoustics; musical transient; anomalous low frequencies; Helmholtz motion;

    Sammanfattning : Of the many waveforms the bowed string can assume, theso-called "Helmholtz motion" (Helmholtz 1862) gives the fullestsound in terms of power and overtone richness. The developmentof this steady-state oscillation pattern can take manydifferent paths, most of which would include noise caused bystick-slip irregularities of the bow-string contact. LÄS MER