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2003ApJS..148....1B - Astrophys. J., Suppl. Ser., 148, 1-27 (2003/September-0)
First-year Wilkinson microwave anisotropy probe (WMAP)(1) observations: preliminary maps and basic results.
BENNETT C.L., HALPERN M., HINSHAW G., JAROSIK N., KOGUT A., LIMON M., MEYER S.S., PAGE L., SPERGEL D.N., TUCKER G.S., WOLLACK E., WRIGHT E.L., BARNES C., GREASON M.R., HILL R.S., KOMATSU E., NOLTA M.R., ODEGARD N., PEIRIS H.V., VERDE L. and WEILAND J.L.
Abstract (from CDS):
A best-fit cosmological model to the CMB and other measures of large-scale structure works remarkably well with only a few parameters. The age of the best-fit universe is t0=13.7±0.2 Gyr. Decoupling was tdec=379+8–7kyr after the big bang at a redshift of zdec=1089±1. The thickness of the decoupling surface was Δzdec=195±2. The matter density of the universe is Ωmh2=0.135+0.008–0.009, the baryon density is Ωbh2=0.0224±0.0009, and the total mass-energy of the universe is Ωtot=1.02±0.02. It appears that there may be progressively less fluctuation power on smaller scales, from WMAP to fine-scale CMB measurements to galaxies and finally to the Lyα forest. This may be accounted for with a running spectral index of scalar fluctuations, fitted as ns=0.93±0.03 at wavenumber k0=0.05Mpc–1 (ℓeff~700), with a slope of dns/dlnk=-0.031+0.016–0.018 in the best-fit model. (For WMAP data alone, ns=0.99±0.04.) This flat universe model is composed of 4.4% baryons, 22% dark matter, and 73% dark energy. The dark energy equation of state is limited to w←0.78 (95% CL). Inflation theory is supported with ns~1, Ωtot~1, Gaussian random phases of the CMB anisotropy, and superhorizon fluctuations implied by the temperature-polarization anticorrelations at decoupling. An admixture of isocurvature modes does not improve the fit. The tensor-to-scalar ratio is r(k0=0.002Mpc–1)<0.90 (95% CL). The lack of CMB fluctuation power on the largest angular scales reported by COBE and confirmed by WMAP is intriguing. WMAP continues to operate, so results will improve.
Abstract Copyright: ∼
Journal keyword(s): Cosmology: Cosmic Microwave Background - Cosmology: Observations - Cosmology: Dark Matter - Cosmology: Early Universe - Instrumentation: Detectors - Space Vehicles: Instruments
Simbad objects: 25
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