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Cosmological Constant Cold Dark Matter Models and the COBE Two-Year Sky Maps

1995; IOP Publishing; Volume: 446; Linguagem: Inglês

10.1086/175765

1538-4357

Emory F. Bunn, Naoshi Sugiyama,

Dark Matter and Cosmic Phenomena

view Abstract Citations (75) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Cosmological Constant Cold Dark Matter Models and the COBE Two-Year Sky Maps Bunn, Emory F. ; Sugiyama, Naoshi Abstract We compare the 2 yr COBE DMR sky maps with the predictions of cosmological constant cold dark matter (ACDM) models. Using a Bayesian analysis, we find that the most likely value of the cosmological constant in a ACDM model is Λ = 0. The data set an upper limit on A of 0.78 (0.85) at 90% confidence, and 0.86 (0.92) at 95% confidence with (without) the quadrupole anisotropy. The angular power spectrum Cl depends only quadratically on Λ when Λ is small; the likelihood function L(Λ) is therefore quite flat near Λ = 0. Publication: The Astrophysical Journal Pub Date: June 1995 DOI: 10.1086/175765 arXiv: arXiv:astro-ph/9407069 Bibcode: 1995ApJ...446...49B Keywords: COSMOLOGY: COSMIC MICROWAVE BACKGROUND; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE; COSMOLOGY: THEORY; Astrophysics E-Print: 10 pages + 3 figures of uuencoded compressed PostScript. Preprint number CfPA-94-th-33, UTAP-187. (We have corrected an error in our analysis.) full text sources arXiv | ADS |