Value of H0 in the inhomogeneous universe

Ido Ben-Dayan, Ruth Durrer, Giovanni Marozzi, Dominik J. Schwarz

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82 Scopus citations

Abstract

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.

Original languageEnglish
Article number221301
JournalPhysical Review Letters
Volume112
Issue number22
DOIs
StatePublished - 6 Jun 2014
Externally publishedYes

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