Summary
This chapter presents a simple introduction to the basic theoretical infrastructure for the construction of cosmological models and the formalism for relating observables to the intrinsic properties of the objects studied. The application of the cosmological principle and the development of the metric for isotropic curved spaces leads to the Robertson-Walker metric. This metric provides the tool for understanding the significance of the cosmological redshift and Hubble’s law as well as determining the angular diameter-redshift relations, number densities in cosmology and the age of the Universe. The formalism enables relations to be derived for any isotropic, homogeneous world model.
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Longair, M.S. (2023). The Theoretical Framework. In: Galaxy Formation. Astronomy and Astrophysics Library. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-65891-8_5
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DOI: https://doi.org/10.1007/978-3-662-65891-8_5
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