Clustering, angular size, and dark energy

2008/03/12 by R. C. Santos, J. A. S. Lima · 33 citations
Physics and Astronomy · #Angular diameter #Astronomy #Astrophysics #Cluster analysis #Cold dark matter #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Mathematical analysis #Physics #Redshift #Smoothness #Spectral index #Spectral line #Statistics #astro-ph #gr-qc

paper · pdf · doi:10.1103/physrevd.77.083505

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 77(8) (American Physical Society) · 9 pages, 7 figures, accepted in Physical Review D

arxiv created 2008/03/12 · openalex publication_date 2008/04/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The influence of dark matter inhomogeneities on the angular size-redshift test is investigated for a large class of flat cosmological models driven by dark energy plus a cold dark matter component (XCDM). The results are presented in two steps. First, the mass inhomogeneities are modeled by a generalized Zeldovich-Kantowski-Dyer-Roeder distance which is characterized by a smoothness parameter \ensuremathα(z) and a power index \ensuremathγ, and, second, we provide a statistical analysis to angular size data for a large sample of milliarcsecond compact radio sources. As a general result, we have found that the \ensuremathα parameter is totally unconstrained by this sample of angular-diameter data.

Citations

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