Search for dissertations about: "Relativity theory"

Showing result 1 - 5 of 53 swedish dissertations containing the words Relativity theory.

  1. 1. Gradient Corrections to Exchange Energies within Density Functional Theory

    University dissertation from Per-Sverre Svendsen, Dept. of Theoretical Physics, Solvegata 14 A, 22362 LUND

    Author : Per-Sverre Svendsen; [1996]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; thermodynamics; statistical physics; exchange energy; Density functional theory; gradient corrections; classical mechanics; Mathematical and general theoretical physics; response theory.; quantum mechanics; gravitation; relativity; Matematisk och allmän teoretisk fysik; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:1996:Svendsen;

    Abstract : The small-wavector expansions for the first- and second-order exchange energy kernels (second-and third-order functional density derivatives of the exchange energy) have been investigated. Expansion coefficients are found, both in the case of a statically screened Coulomb interaction and a 'bare' interaction. READ MORE

  2. 2. Theoretical and numerical bimetric relativity

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Francesco Torsello; Edvard Mörtsell; Eugeny Babichev; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; spin-2 fields; extension of general relativity; ghost-free bimetric theory; Hassan–Rosen bimetric relativity; numerical relativity; Theoretical Physics; teoretisk fysik;

    Abstract : General relativity (GR) is the standard physical theory describing gravitational interactions. All astrophysical and cosmological observations are compatible with its predictions, provided that unknown matter and energy components are included. These are called dark matter and dark energy. READ MORE

  3. 3. String Theory at the Horizon Quantum Aspects of Black Holes and Cosmology

    University dissertation from Uppsala : Institutionen för teoretisk fysik

    Author : Martin Olsson; Ulf Danielsson; Lárus Thorlacius; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; theoretical physics; string theory; black holes; cosmology; de Sitter space; c=1 matrix models; 2D string theory; topological string theory; conifolds; 4D BPS black holes; Gödel universe; closed time-like curves; Teoretisk fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : String theory is a unified framework for general relativity and quantum mechanics, thus being a theory of quantum gravity. In this thesis we discuss various aspects of quantum gravity for particular systems, having in common the existence of horizons. READ MORE

  4. 4. Aspects of the Duality between Supersymmetric Yang-Mills Theory and String Theory

    University dissertation from Department of Theoretical Physics, Lund University

    Author : Daniel Bundzik; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Matematisk och allmän teoretisk fysik; classical mechanics; quantum mechanics; relativity; gravitation; statistical physics; thermodynamics; Natural science; Naturvetenskap; Physics; Fysik; Mathematical and general theoretical physics; Star product; Leigh-Strassler deformation; R-matrix; Integrability; Spin-chains; Fractional D-branes; type IIB string theory; AdS CFT-correspondence; gauge gravity correspondence; kvantmekanik; klassisk mekanik; termodynamik; statistisk fysik; relativitet;

    Abstract : This thesis deals with three topics related to the Ads/CFT correspondence. In Paper I, solutions describing the geometry of fractional D1-branes of Type IIB string theory are presented. The running coupling constant is computed on the gauge theory side. READ MORE

  5. 5. Perturbative Methods in General Relativity

    University dissertation from Umeå : Fysik

    Author : Daniel Eriksson; Michael Bradley; Gert Brodin; Lászlo Árpád Gergely; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; General relativity; perturbation theory; photon-photon scattering; cosmology; FRW models with cosmological constant; Bianchi type V; slowly rotating stars; Hartle formalism; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : Einstein's theory of general relativity is a cornerstone in the process of gaining increased understanding about problems of gravitational nature. It can be applied to problems on the huge length scales of cosmology and as far as we know it does not break down before the Planck scale is approached. READ MORE