Abstract
We introduce in this chapter the geometric basis of cosmology and the expansion of the universe. A part from the technical treatment, historical, theological and mythological introductions to cosmology can be found in Ryden (Introduction to Cosmology, Addison-Wesley, San Francisco, 244 p 2003) and Bonometto (Cosmologia & Cosmologie, Zanichelli 2008).
Oras ubicumque locaris extremas, quaeram: quid telo denique fiet?
(wherever you shall set the boundaries, I will ask: what will then happen to the arrow?)
Lucretius, De Rerum Natura
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Notes
- 1.
This means that they possess 6 Killing vectors, i.e. there are six transformations which leave the spatial metric invariant (Weinberg 1972).
- 2.
See also Lemaître (1997) for a recent republication and translation of Lemaître’s 1933 paper.
- 3.
Pretty much the same happens with the redshift. A certain source has redshift z which, actually, is not a constant but varies slowly. This is called redshift drift and it was first considered by Sandage (1962) and McVittie (1962). Applications of the redshift drift phenomenon to gravitational lensing are proposed in Piattella and Giani (2017).
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Piattella, O. (2018). The Universe in Expansion. In: Lecture Notes in Cosmology. UNITEXT for Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-95570-4_2
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