2014/09/30 by Nico Hamaus, P. M. Sutter, Guilhem Lavaux +2 · 2 citations
Physics and Astronomy · #Astronomy #Astrophysics #COSMIC cancer database #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Metric expansion of space #Physics #Redshift #Redshift survey #Redshift-space distortions #Stellar, planetary, and galactic studies #Void (composites) #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2014/12/013
published as JCAP12 (2014) 013 · 17 pages, 3 figures. Matches JCAP published version
openalex publication_date 2014/12/09 · arxiv created 2014/12/10 · arxiv updated 2014/12/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose a novel technique to probe the expansion history of the Universe based on the clustering statistics of cosmic voids. In particular, we compute their two-point statistics in redshift space on the basis of realistic mock galaxy catalogs and apply the Alcock-Paczynski test. In contrast to galaxies, we find void auto-correlations to be marginally affected by peculiar motions, providing a model-independent measure of cosmological parameters without systematics from redshift-space distortions. Because only galaxy-galaxy and void-galaxy correlations have been considered in these types of studies before, the presented method improves both statistical and systematic uncertainties on the product of angular diameter distance and Hubble rate, furnishing the potentially cleanest probe of cosmic geometry available to date.