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