Cobe-dmr-normalisation for Innationary at Dark Matter Models

The two-year C OBE-DMR 53 and 90 GHz sky maps, in both galactic and ecliptic coordinates, are used to determine the normalisation of innationary universe models with a at global geometry and adiabatic density perturbations. The appropriately normalised cold and mixed dark matter models and cosmological constant dominated, cold dark matter models, computed for a range of values of b and h, are then compared to various measures of structure in the universe. Critical density CDM models appear to be irreconcilable with observations on both large and small scales simultaneously , whereas MDM models provide a somewhat better t to the data. Although the C OBE-DMR data alone prefer a nearly critical value for the total density, low-density cosmological constant models with 0 0:15 can not be rejected at a conndence level exceeding 95%. Such models may also provide a signiicantly better t to the matter distribution data than critical density CDM.