Search for dissertations about: "Spacetimes"

Showing result 1 - 5 of 17 swedish dissertations containing the word Spacetimes.

  1. 1. Multipole moments of axisymmetric spacetimes

    Author : Thomas Bäckdahl; Magnus Herberthson; Brian Edgar; Kjell Rosquist; Linköpings universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; multipole moments; axisymmetry; spacetimes; prescribed; solutions; static; stationary; Kerr; Weyl; Ernst; Theory of relativity; gravitation; Relativitetsteori; gravitation;

    Abstract : In this thesis we study multipole moments of axisymmetric spacetimes. Using the recursive definition of the multipole moments of Geroch and Hansen we develop a method for computing all multipole moments of a stationary axisymmetric spacetime without the use of a recursion. READ MORE

  2. 2. Horizons and time machines : global structures in locally trivial spacetimes

    Author : Sören Holst; Jürgen Ehlers; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Spacetimes; Time machines; Relativity theory; Tidsmaskiner; Relativitetsteori; Physics; Fysik; Physics; fysik;

    Abstract : .... READ MORE

  3. 3. Shapes of Spacetimes : Collected tales of black holes

    Author : Emma Jakobsson; Ingemar Bengtsson; Marc Mars; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Theoretical Physics; teoretisk fysik;

    Abstract : In theory, the existence of black holes is predicted by general relativity. In reality, there is a general consensus that they exist in space; in particular at the center of many galaxies. The theory of black holes has been around for decades, but there are still interesting questions calling for attention. READ MORE

  4. 4. Multipole Moments of Stationary Spacetimes

    Author : Thomas Bäckdahl; Magnus Herberthson; Brien Nolan; Linköpings universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; multipole moments; stationary; static; relativistic; spacetime; convergence; specified; Mathematical physics; Matematisk fysik;

    Abstract : In this thesis we study the relativistic multipole moments for stationary asymptotically flat spacetimes as introduced by Geroch and Hansen. These multipole moments give an asymptotic description of the gravitational field in a coordinate independent way. READ MORE

  5. 5. The Chevreton Superenergy Tensor in Einstein-Maxwell Spacetimes

    Author : Ingemar Eriksson; Göran Bergqvist; Paul Todd; Linköpings universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Einstein-Maxwell; graviational energy; superenergy; Bel tensor; Chevreton tensor; conservation laws; Conformal Einstein space; Theory of relativity; gravitation; Relativitetsteori; gravitation;

    Abstract : In this thesis we investigate the superenergy tensor that was introduced by Chevreton in 1964 as an electromagnetic counterpart to the Bel-Robinson tensor for the gravitational feld.We show that in Einstein-Maxwell spacetimes with a source-free electromagnetic feld, the Chevreton superenergy tensor has many interesting properties. READ MORE