2008/07/31 by Edward W. Kolb, Valerio Marra, S. Matarrese +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc
paper · pdf · doi:10.1103/physrevd.78.103002
published as Phys.Rev.D78:103002,2008 · 22 pages, 8 figures; replaced to fit the version accepted for publication in Phys. Rev. D
openalex publication_date 2008/11/04 · arxiv created 2008/11/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It has been argued that the spacetime of our universe can be accurately described by a perturbed conformal Newtonian metric, and hence even large density inhomogeneities in a dust universe cannot change the observables predicted by the homogeneous dust model. In this paper we study a spherically symmetric dust model and illustrate conditions under which large spatial variations in the expansion rate can invalidate the argument.