FIRST-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) 1 OBSERVATIONS: DETERMINATION of COSMOLOGICAL PARAMETERS D. N. Spergel,2
The Astrophysical Journal Supplement Series, 148:175–194, 2003 September E # 2003. The American Astronomical Society. All rights reserved. Printed in U.S.A. FIRST-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP)1 OBSERVATIONS: DETERMINATION OF COSMOLOGICAL PARAMETERS D. N. Spergel,2 L. Verde,2,3 H. V. Peiris,2 E. Komatsu,2 M. R. Nolta,4 C. L. Bennett,5 M. Halpern,6 G. Hinshaw,5 N. Jarosik,4 A. Kogut,5 M. Limon,5,7 S. S. Meyer,8 L. Page,4 G. S. Tucker,5,7,9 J. L. Weiland,10 E. Wollack,5 and E. L. Wright11 Received 2003 February 11; accepted 2003 May 20 ABSTRACT WMAP precision data enable accurate testing of cosmological models. We find that the emerging standard model of cosmology, a flat Ã-dominated universe seeded by a nearly scale-invariant adiabatic Gaussian fluctuations, fits the WMAP data. For the WMAP data only, the best-fit parameters are h ¼ 0:72 Æ 0:05, 2 2 þ0:076 bh ¼ 0:024 Æ 0:001, mh ¼ 0:14 Æ 0:02, ¼ 0:166À0:071, ns ¼ 0:99 Æ 0:04, and 8 ¼ 0:9 Æ 0:1. With parameters fixed only by WMAP data, we can fit finer scale cosmic microwave background (CMB) measure- ments and measurements of large-scale structure (galaxy surveys and the Ly forest). This simple model is also consistent with a host of other astronomical measurements: its inferred age of the universe is consistent with stellar ages, the baryon/photon ratio is consistent with measurements of the [D/H] ratio, and the inferred Hubble constant is consistent with local observations of the expansion rate.
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