Sökning: "1 3-covariant formalism"

Hittade 3 uppsatser innehållade orden 1 3-covariant formalism.

1. 1. Non-isotropic Cosmology in 1+3-formalism

   Master-uppsats, Linköpings universitet/Matematiska institutionen; Linköpings universitet/Tekniska högskolan

   Författare :Johan Jönsson; [2014]
   Nyckelord :Non-isotropic cosmology; Einstein; Relativity; Bianchi Type I; 1 3-covariant formalism;

   Sammanfattning : Cosmology is an attempt to mathematically describe the behaviour of the universe, the most commonly used models are the Friedmann-Lemaître-Robertson-Walker solutions. These models seem to be accurate for an old universe, which is homogeneous with low anisotropy. LÄS MER

3. 2. Density Growth in Anisotropic Cosmologies of Bianchi Type I

   Master-uppsats, Institutionen för fysik

   Författare :Tomas Sverin; [2012]
   Nyckelord :;

   Sammanfattning : This work generalises earlier works on the growth of the density perturbations in Bianchi type I cosmologies filled with dust to include also the effects of pressure anda positive cosmological constant. For the analysis the 1+3 covariant split of space-time formalism is used. LÄS MER

4. 3. Lanczos potentialer i kosmologiska rumtider

   Uppsats för yrkesexamina på grundnivå, Matematiska institutionen

   Författare :David Holgersson; [2004]
   Nyckelord :Applied mathematics; Weyl-Lanczos equation; Lanczos potentials; 1 3 covariant formalism; perfect fluid; cosmology; Bianchi type I models; shear-free and irrotational models; Tillämpad matematik;

   Sammanfattning : We derive the equation linking the Weyl tensor with its Lanczos potential, called the Weyl-Lanczos equation, in 1+3 covariant formalism for perfect fluid Bianchi type I spacetime and find an explicit expression for a Lanczos potential of the Weyl tensor in these spacetimes. To achieve this, we first need to derive the covariant decomposition of the Lanczos potential in this formalism. LÄS MER