2014/01/31 by Ido Ben-Dayan, Ruth Durrer, Giovanni Marozzi +1 · 4 citations
Physics and Astronomy · #Algorithm #Anisotropy #Astrophysics #Cold dark matter #Computer science #Cosmic microwave background #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Deceleration parameter #Distance modulus #Galaxies: Formation, Evolution, Phenomena #Galaxy #Hubble's law #Physics #Quantum mechanics #Redshift #Universe #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevlett.112.221301
published as Phys. Rev. Lett. 112, 221301 (2014) · 5 pages, 2 figures. Minor changes in the presentation of the first part made, typos corrected, comments and references added. Version accepted for publication in Physical Review Letters
arxiv created 2014/05/22 · openalex publication_date 2014/06/06 · arxiv updated 2014/06/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Local measurements of the Hubble expansion rate are affected by structures like galaxy clusters or voids. Here we present a fully relativistic treatment of this effect, studying how clustering modifies the mean distance- (modulus-)redshift relation and its dispersion in a standard cold dark matter universe with a cosmological constant. The best estimates of the local expansion rate stem from supernova observations at small redshifts (0.01<z<0.1). It is interesting to compare these local measurements with global fits to data from cosmic microwave background anisotropies. In particular, we argue that cosmic variance (i.e., the effects of the local structure) is of the same order of magnitude as the current observational errors and must be taken into account in local measurements of the Hubble expansion rate.