Sökning: "Spacetimes"

Visar resultat 1 - 5 av 19 avhandlingar innehållade ordet Spacetimes.

1. 1. Multipole moments of axisymmetric spacetimes

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

   Sammanfattning : 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. LÄS MER

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

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

   Sammanfattning : .... LÄS MER

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

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

   Sammanfattning : 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. LÄS MER

5. 4. Multipole Moments of Stationary Spacetimes

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

   Sammanfattning : 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. LÄS MER

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

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

   Sammanfattning : 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. LÄS MER