Clustering, angular size, and dark energy

Journal Article · Tue Apr 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.083505· OSTI ID:21250000

Santos, R C; Lima, J A. S. ^[1]

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1. Departamento de Astronomia, Universidade de Sao Paulo, 05508-900 Sao Paulo, SP (Brazil)

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 {alpha}(z) and a power index {gamma}, 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 {alpha} parameter is totally unconstrained by this sample of angular-diameter data.

• OSTI ID: 21250000
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL MODELS
DISTANCE
MASS
NONLUMINOUS MATTER
RED SHIFT