2020/04/09 by Vasiliki Pavlidou, Giorgos Korkidis, Theodore N. Tomaras +2 · 9 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #COSMIC cancer database #Constraint (computer-aided design) #Cosmological constant #Cosmological model #Cosmology #Cosmology and Gravitation Theories #Density contrast #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble's law #Scale (ratio) #astro-ph.CO
paper · pdf · doi:10.1051/0004-6361/201937358
published in Astronomy and Astrophysics 638, L8 (EDP Sciences) · 5 pages, 3 figures, submitted to A&AL
arxiv created 2020/04/09 · openalex created_date 2020/04/17 · openalex publication_date 2020/06/01 · arxiv updated 2020/07/01 · openalex updated_date 2026/08/05
Spherical collapse predicts that a single value of the turnaround density, meaning the average matter density within the scale on which a structure detaches from the Hubble flow, characterizes all cosmic structures at the same redshift. It was recently shown by Korkidis et al. that this feature persists in complex non-spherical galaxy clusters that have been identified in N -body simulations. Here we show that the low-redshift evolution of the turnaround density constrains the cosmological parameters and it can be used to derive a local constraint on Ω Λ, 0 alone, independent of Ω m, 0 . The turnaround density thus offers a promising new method for exploiting upcoming large cosmological datasets.