Volume 638, June 2020
|Number of page(s)||5|
|Section||Letters to the Editor|
|Published online||17 June 2020|
Letter to the Editor
Turnaround density as a probe of the cosmological constant
Department of Physics and Institute for Theoretical and Computational Physics, University of Crete, 70013 Heraklio, Greece
2 Institute of Astrophysics, Foundation for Research and Technology – Hellas, Vassilika Vouton, 70013 Heraklio, Greece
3 Department of Astronomy and Astrophysics and KICP, University of Chicago, Chicago, IL 60637, USA
Accepted: 20 April 2020
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 ΩΛ, 0 alone, independent of Ωm, 0. The turnaround density thus offers a promising new method for exploiting upcoming large cosmological datasets.
Key words: cosmological parameters / large-scale structure of Universe / galaxies: clusters: general
© ESO 2020
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