Search for dissertations about: "GRAVITY MODEL"

Showing result 6 - 10 of 184 swedish dissertations containing the words GRAVITY MODEL.

  2. 6. Cosmological models, nonideal fluids and viscous forces in general relativity

    Author : Daniele Gregoris; Kjell Rosquist; Alan Coley; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; gravity; exact model; black hole; friction; teoretisk fysik; Theoretical Physics;

    Abstract : This thesis addresses the open questions of providing a cosmological model describing an accelerated expanding Universe without violating the energy conditions or a model that contributes to the physical interpretation of the dark energy. The former case is analyzed considering a closed model based on a regular lattice of black holes using the Einstein equation in vacuum. READ MORE

  4. 7. Gravity, gauge theories and the matrix model

    Author : Teresia Månsson; Esko Keski-Vakkuri; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Theoretical Physics; teoretisk fysik;

    Abstract : .... READ MORE

  5. 8. A height datum for Uganda based on a gravimetric quasigeoid model and GNSS/levelling

    Author : Ronald Ssengendo; Lars Sjoberg; Anthony Gidudu; Hossein Nahavandchi; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geoid model; GNSS levelling; KTH method; Uganda; Uganda Vertical Network; Quasigeoid model; Geodesy and Geoinformatics; Geodesi och geoinformatik;

    Abstract : This study is devoted to the determination of a high resolution gravimetric geoid model for Uganda based on the optimal combination of terrestrial and satellite gravity anomalies using the method of Least Squares Modification of Stokes’ formula with additive corrections. Specifically the study investigates the current status of the existing Uganda Vertical Network relative to the requirements of a modern height datum and includes a detailed evaluation and validation of terrestrial gravity data, several digital elevation models and some recent global geopotential models. READ MORE

  6. 9. Making Maps and Keeping Logs : Quantum Gravity from Classical Viewpoints

    Author : Niklas Johansson; Ulf Danielsson; Jan de Boer; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; String theory; black holes in string theory; Calabi-Yau geometry; flux compactifications; three-dimensional gravity; Mathematical physics; Matematisk fysik; Theoretical Physics; teoretisk fysik;

    Abstract : This thesis explores three different aspects of quantum gravity. First we study D3-brane black holes in Calabi-Yau compactifications of type IIB string theory. Using the OSV conjecture and a relation between topological strings and matrix models we show that some black holes have a matrix model description. READ MORE

  7. 10. Essays on African Growth, Productivity, and Trade

    Author : Ludvig Söderling; Nationalekonomiska institutionen; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; ekonomiska system; ekonomisk teori; ekonometri; Nationalekonomi; Africa; economic policy; economic systems; economic theory; econometrics; Economics; trade; gravity model; general equilibrium model; oil; diversification; Dutch disease; productivity; ekonomisk politik; International commerce; Internationell ekonomi; Economics of development; Utvecklingsekonomi; growth;

    Abstract : The thesis comprises an introductory chapter and four research papers. The introductory chapter provides a brief overview of recent economic growth performance in Africa, places the individual papers into a coherent context, summarizes the main findings, and discusses their relevance for economic policy. READ MORE