Cosmic Microwave Background Anisotropy Constraints on Open and Flat‐Λ Cold Dark Matter Cosmogonies from UCSB South Pole, ARGO, MAX, White Dish, and SuZIE Data

Abstract

We use combinations of 10 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-? cold dark matter cosmogonies with nonrelativistic mass density parameter ?0 in the range 0.1-1, baryonic mass density parameter ?B 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 ?0, the combined data favor a ?01 (1) open (flat-?) model. Excluding the smallest angular scale SuZIE data, an ?00.3 (1) open (flat-?) model is favored. Considering only multifrequency data with error bars consistent with sample variance and noise considerations, i.e., the South Pole 1994 Ka band, the MAX 4 ? Draconis, and the MAX 5 HR5127 data, an ?00.1 (1) open (flat-?) model is favored. For both open and flat-? models and for all three combinations of data sets, after marginalizing over all other parameters, a lower ?Bh2 (~0.005) or younger (t0~10 Gyr) universe is favored. However, the data do not rule out other values of ?0 in the flat-? model and other values of ?Bh2 in both models. At 2 ? confidence, model normalizations deduced from the small-scale data are consistent with those derived from the Differential Microwave Radiometer data. We emphasize that since we consider only a small number of data sets, these results are tentative.