Sökning: "Lagrangian duality"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Lagrangian duality.

  1. 1. Exploring effective descriptions of gauge fields and strings : A Lagrangian approach with insights from color-kinematics duality

    Författare :Lucia M. Garozzo; Henrik Johansson; Chris White; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; scattering amplitudes; double copy; gauge theory; string theory; Theoretical Physics; Teoretisk fysik;

    Sammanfattning : The concept of a color-kinematics duality is an important driving force in advancing the modern understanding of scattering amplitudes, in both field theory and string theory. Yet, open questions remain that motivate the need for a deeper understanding of the duality. LÄS MER

  3. 2. Contributions to dual subgradient optimization and maintenance scheduling

    Författare :Emil Gustavsson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Subgradient optimization; Lagrangian duality; convex programming; maintenance scheduling; integer optimization; Lagrangian duality;

    Sammanfattning : This thesis analyses two topics within the area of mathematical optimization; dual subgradient methods and maintenance optimization. The first two papers consider dual subgradient methods, and the third paper considers maintenance optimization. LÄS MER

  4. 3. Aspects of Duality in Integer Programming

    Författare :Tuomo Takkula; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis deals with various problems arising when dualizing integer programs and combinatorial optimization problems. On the one hand, the corresponding dual functions are piecewise linear, calling for approaches from nondifferentiable optimization; on the other hand, the problems have special structures which can be exploited. LÄS MER

  5. 4. The Complex World of Superstrings : On Semichiral Sigma Models and N=(4,4) Supersymmetry

    Författare :Malin Göteman; Ulf Lindström; Daniel Waldram; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Non-linear sigma models; extended supersymmetry; semichiral superfields; neutral hyperkähler geometry; generalized Kähler geometry; T-duality; vector multiplets; Theoretical Physics; Teoretisk fysik;

    Sammanfattning : Non-linear 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. LÄS MER

  7. 5. Strings as Sigma Models and in the Tensionless Limit

    Författare :Jonas Persson; Ulf Lindström; Joseph Minahan; Fawad Hassan; Uppsala universitet; []
    Nyckelord :Theoretical physics; Theoretical Physics; String Theory; Tensionless Strings; Supergravity Backgrounds; Plane Wave; Extended Supersymmetry; Non-Linear Sigma Models; Generalized Complex Geometry; T-duality; Teoretisk fysik;

    Sammanfattning : 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 shock-wave. LÄS MER