| Title: |
Turnaround density as a probe of the cosmological constant |
| Authors: |
Pavlidou, Vasiliki, Korkidis, Giorgos, Tomaras, Theodore, Tanoglidis, Dimitrios |
| Source: |
A&A 638, L8 (2020) |
| Publication Year: |
2020 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Cosmology and Nongalactic Astrophysics |
| More Details: |
Spherical collapse predicts that a single value of the turnaround density (average matter density within the scale on which a structure detaches from the Hubble flow) characterizes all cosmic structures at the same redshift. It has been recently shown by Korkidis et al. that this feature persists in complex non-spherical galaxy clusters identified in N-body simulations. Here we show that the low-redshift evolution of the turnaround density constrains the cosmological parameters, and that it can be used to derive a local constraint on $\Omega_\Lambda$ alone, independent of $\Omega_m$. The turnaround density thus provides a promising new way to exploit upcoming large cosmological datasets.
Comment: 5 pages, 3 figures, submitted to A&AL |
| Document Type: |
Working Paper |
| DOI: |
10.1051/0004-6361/201937358 |
| Access URL: |
http://arxiv.org/abs/2004.04395 |
| Accession Number: |
edsarx.2004.04395 |
| Database: |
arXiv |
