2010/02/16 by L. Perivolaropoulos, L Perivolaropoulos · 16 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #COSMIC cancer database #Consistency (knowledge bases) #Context (archaeology) #Cosmological constant #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Generalization #Lambda-CDM model #Parametrization (atmospheric modeling) #Physical cosmology #Scale (ratio) #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · open access · doi:10.1088/1742-6596/222/1/012024
published in Journal of Physics Conference Series 222, 012024 (IOP Publishing) · 20 pages, 6 figures. Invited review at the 1st Mediterranean Conference on Classical and Quantum Gravity (MCCQG). To appear in the proceedings
arxiv created 2010/02/16 · openalex publication_date 2010/04/01 · arxiv updated 2015/05/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The ΛCDM cosmological model assumes the existence of a small cosmological constant in order to explain the observed accelerating cosmic expansion. Despite the dramatic improvement of the quality of cosmological data during the last decade it remains the simplest model that fits remarkably well (almost) all cosmological observations. In this talk I review the increasingly successful fits provided by ΛCDM on recent geometric probe data of the cosmic expansion. I also briefly discuss some emerging shortcomings of the model in attempting to fit specific classes of data (eg cosmic velocity dipole flows and cluster halo profiles). Finally, I summarize recent results on the theoretically predicted matter overdensity evolution (a dynamical probe of the cosmic expansion), emphasizing its scale and gauge dependence on large cosmological scales in the context of general relativity. A new scale dependent parametrization which describes accurately the growth rate of perturbations even on scales larger than 100 h −1 Mpc is shown to be a straightforward generalization of the well known scale independent parametrization f ( a ) = Ω m ( a ) γ valid on smaller cosmological scales.