2011/02/28 by Krzysztof Bolejko, Marie-Noëlle Célérier, Andrzej Krasiński · 1 citation
Physics and Astronomy · #astro-ph.CO #gr-qc
paper · pdf · doi:10.1088/0264-9381/28/16/164002
published as Class. Quantum Grav. 28 (2011) 164002 · 32 pages, 2 figures, contribution to Classical and Quantum Gravity special issue "Inhomogeneous Cosmological Models and Averaging in Cosmology"
arxiv created 2011/10/13 · arxiv updated 2011/10/17
Recently, inhomogeneous generalisations of the Friedmann-Lemaitre-Robertson-Walker cosmological models have gained interest in the astrophysical community and are more often employed to study cosmological phenomena. However, in many papers the inhomogeneous cosmological models are treated as an alternative to the FLRW models. In fact, they are not an alternative, but an exact perturbation of the latter, and are gradually becoming a necessity in modern cosmology. The assumption of homogeneity is just a first approximation introduced to simplify equations. So far this assumption is commonly believed to have worked well, but future and more precise observations will not be properly analysed unless inhomogeneities are taken into account. This paper reviews recent developments in the field and shows the importance of an inhomogeneous framework in the analysis of cosmological observations.