%0 Journal Article
%T Turnaround density as a probe of the cosmological constant
%A Dimitrios Tanoglidis
%A Giorgos Korkidis
%A Theodore N. Tomaras
%A Vasiliki Pavlidou
%J -
%D 2020
%R 10.1051/0004-6361/201937358
%X 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 <i>N<i/>-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 ¦¸<sub>¦«,£¿0<sub/> alone, independent of ¦¸<sub>m,£¿0<sub/>. The turnaround density thus offers a promising new method for exploiting upcoming large cosmological datasets
%U https://www.aanda.org/articles/aa/full_html/2020/06/aa37358-19/aa37358-19.html