The Cosmological Models
Before the observational evidence is presented in detail it seems convenient to establish a few theoretical concepts. The basic motivation is to describe the expansion of the universe in as simple terms as possible. In this restricted sense the classical term “cosmological model” usually means a geometrical description of the space-time structure and the smoothed-out matter and radiation content of an expanding universe. Clearly the theory then has the task of explaining the origin of the structures that are observed. How simple can the universe have been originally in order to still allow for the evolution of galaxies, stars, and ourselves? This auestion will be discussed in Part III.
KeywordsCosmological Model Curvature Tensor Perfect Fluid Null Geodesic Initial Singularity
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