2012/03/13 by Marie-Noëlle Célérier, Célérier, Marie-Noëlle
Earth and Planetary Sciences · Physics and Astronomy · #Astronomy and Astrophysical Research #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Geophysics and Gravity Measurements
paper · pdf · doi:10.48550/arxiv.1203.2814
openalex publication_date 2012/03/13 · openalex created_date 2022/09/26 · openalex updated_date 2026/07/28
The current standard model of cosmology, the LambdaCDM model, is based on the\nhomogeneous FLRW solutions of the Einstein equations to which some\nperturbations are added to account for the CMB features and structure formation\nat large scales. This model fits rather well the observations provided 95% of\nthe energy density budget of the Universe should be of an unknown physical\nnature, i.e. dark matter and dark energy. Now, the aim of a cosmological model\nis not merely to reproduce the observations, but also to give a physical\nunderstanding of the Universe we live in. Moreover, even if the assumption of\nhomogeneity seems to be more or less valid at large scales, it appears to be in\ncontradiction with observations at intermediate scales (between the scale of\nnon linear structure formation and that where structures virialize). This is\nthe reason why, during the last decade, a community of researchers formed whose\naim was to look for the best way to take into account the influence of the\ninhomogeneities seen in the Universe and to construct accurate cosmological\nmodels which could possibly get rid of the dark components. This task, which is\nstill in its infancy, is currently progressing towards promising results. Two\ntypes of methods can be found in the literature: spatial averaging of scalar\nquantities and use of exact inhomogeneous solutions of General Relativity. We\nwill give here a brief report of the second one.\n