Titlebook: Spacetime; Foundations of Gener Marcus Kriele Book 1999 Springer-Verlag Berlin Heidelberg 1999 Causality.Cosmology.Gravitation.Relativity.S

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Robertson-Walker cosmology,rtion of the universe. Hence any cosmological model reflects our own prejudice. Nevertheless, there are certain assumptions which seem to have a high degree of plausibility. After having built a cosmological model one can compare it with the few data we do have. Although imperfect, this approach see

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Spherical symmetry,plicitly known solutions of Einstein’s equations for physically plausible matter fields have a high degree of symmetry. Secondly, a spherically symmetric spacetimes are very good descriptions of non-rotating, isolated stars and therefore of astrophysical interest. (If the star rotates the rotation a

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Singularity theorems,at there has been a big bang — or at least that there are regions in spacetime where general relativity breaks down. They are one of the main motivations for attempting to quantise general relativity. While there is a lot of evidence in favour of this interpretation we will see that there are also o