Cosmological Parameter Extraction from the First Season of Observations with DASI

Details Cosmological Parameter Extraction from the First Season of Observations with DASI Cosmological Parameter Extraction from the First Season of Observations with DASI

2001-04-30

arxiv.org/abs/astro-ph/0104490v2

Astrophys.J. 568 (2002) 46-51

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, minor changes in response to referee comments

Scientific paper

10.1086/338880

The Degree Angular Scale Interferometer (\dasi) has measured the power spectrum of the Cosmic Microwave Background anisotropy over the range of spherical harmonic multipoles 1000.45 and 0.0<=tau_c<=0.4, we find that the total density of the Universe Omega_tot=1.04+/-0.06, and the spectral index of the initial scalar fluctuations n_s=1.01+0.08-0.06, in accordance with the predictions of inflationary theory. In addition we find that the physical density of baryons Omega_b.h^2=0.022+0.004-0.003, and the physical density of cold dark matter Omega_cdm.h^2=0.14+/-0.04. This value of Omega_b.h^2 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 Omega_t=1.00+/-0.04, the matter density Omega_m=0.40+/-0.15, and the vacuum energy density Omega_lambda=0.60+/-0.15. (All 68% confidence limits.)

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