Cosmological Parameter Extraction from the First Season of Observations with DASI
Abstract
The Degree Angular Scale Interferometer () has measured the power spectrum of the Cosmic Microwave Background anisotropy over the range of spherical harmonic multipoles 100<l<900. We compare this data, in combination with the COBE-DMR results, to a seven dimensional grid of adiabatic CDM models. Adopting the priors h>0.45 and 0.0<=tauc<=0.4, we find that the total density of the Universe Omegatot=1.04+/-0.06, and the spectral index of the initial scalar fluctuations ns=1.01+0.08-0.06, in accordance with the predictions of inflationary theory. In addition we find that the physical density of baryons Omegab.h2=0.022+0.004-0.003, and the physical density of cold dark matter Omegacdm.h2=0.14+/-0.04. This value of Omegab.h2 is consistent with that derived from measurements of the primordial abundance ratios of the light elements combined with big bang nucleosynthesis theory. Using the result of the HST Key Project h=0.72+/-0.08 we find that Omegat=1.00+/-0.04, the matter density Omegam=0.40+/-0.15, and the vacuum energy density Omegalambda=0.60+/-0.15. (All 68% confidence limits.)
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