Cosmic Microwave Background Anisotropy inCOBEDMR‐normalized Open and Flat‐Λ Cold Dark Matter Cosmogonies

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Abstract
We compute the cosmic microwave background (CMB) anisotropy in open and flat-Λ cold dark matter (CDM) cosmogonies which are normalized to the two-year DMR sky maps. Presently available CMB data are consistent with Ω0 ~ 0.3-0.4 open models but do not strongly disfavor open models with either Ω0 ~ 0.1 or Ω0 ~ 1. There are indications that old (t0 15-16 Gyr), high baryon density (ΩB 0.0175 h-2), low-density (Ω0 ~ 0.2-0.4), spatially flat Λ models have more intermediate-scale power than is suggested by presently available CMB anisotropy observations. Accumulating CMB data should strengthen the observational discriminative power; however, a better understanding of systematic effects will be needed before it will be possible to draw robust conclusions about model viability.