2018/07/05 by Yehuda Hoffman, Edoardo Carlesi, Daniel Pomarède +6
Physics and Astronomy · #Astronomy and Astrophysical Research #Cold dark matter #Cosmology #Cosmology and Gravitation Theories #Dark matter #Field (mathematics) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Peculiar velocity #Redshift #Structure formation #Universe #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1038/s41550-018-0502-4
published as Nature Astronomy 2018 · Accepted for publication in Nature Astronomy. Full article available here https://www.nature.com/articles/s41550-018-0502-4. A version of the arxiv paper including higher resolution versions of the paper images can be obtained from https://edoardocarlesi.github.io/files/CF2_QL_NatAst_arxiv.pdf
openalex publication_date 2018/07/05 · arxiv created 2018/07/10 · arxiv updated 2018/07/11 · openalex created_date 2018/07/19 · openalex updated_date 2026/08/05
The local Universe provides a unique opportunity for testing cosmology and theories of structure formation. To facilitate this opportunity we present a new method for the reconstruction of the quasi-linear matter density and velocity fields from galaxy peculiar velocities and apply it to the Cosmicflows-2 data. The method consists of constructing an ensemble of cosmological simulations, constrained by the standard cosmological model and the observational data. The quasi-linear density field is the geometric mean and variance of the fully non-linear density fields of the simulations. The main nearby clusters (Virgo, Centaurus, Coma), superclusters (Shapley, Perseus-Pisces) and voids (Dipole Repeller) are robustly reconstructed. Galaxies are born biased with respect to the underlying dark matter distribution. Using our quasi-linear framework we demonstrate that the luminosity-weighted density field derived from the 2M++ redshift compilations is non-linearly biased with respect to the matter density field. The bias diminishes in the linear regime.