CMB anisotropy constraints on open and flat-lambda CDM cosmogonies from UCSB

• Main Authors: Bharat Ratra, Ken Ganga, Graça Rocha, Naoshi Sugiyama, Krzysztof M. Górski
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1999
• Subjects: Lambda; South Pole; South pole
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.254.6163; http://arxiv.org/pdf/astro-ph/9901014v1.pdf

We use combinations of ten small-scale cosmic microwave background anisotropy data sets from the UCSB South Pole 1994, ARGO, MAX 4 and 5, White Dish and SuZIE experiments to constrain cosmogonies. We consider open and spatially-flat-Λ cold dark matter cosmogonies, with nonrelativistic-mass density parameter Ω0 in the range 0.1–1, baryonic-mass density parameter ΩB in the range (0.005–0.029)h −2, and age of the universe t0 in the range (10–20) Gyr. Marginalizing over all parameters but Ω0, the combined data favors an Ω0 ≃ 1 (1) open (flat-Λ) model. Excluding the smallest angular scale SuZIE data, an Ω0 ≃ 0.3 (1) open (flat-Λ) model is favored. Considering only multi-frequency data with error bars consistent with sample variance and noise considerations, i.e., the South Pole 1994 Ka band, the MAX 4 ι Draconis, and the MAX 5 HR5127 data, an Ω0 ≃ 0.1 (1) open (flat-Λ) model is favored. For both open and flat-Λ models and for all three combinations of data sets, after marginalizing over all the other parameters, a lower ΩBh 2 ( ∼ 0.005) or younger (t0 ∼ 10 Gyr) universe is favored. However, the data do