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"First-year Wilkinson Microwave
Anisotropy Probe (WMAP) Observations: Determination of cosmological
parameters," by D.N. Spergel and
16 others, Astrophysical Journal Supplement Series, 148(1): 175-94,
September 2003. [Authors' affiliations: 6 U.S. and Canadian institutions]
Related
information:
by lead-author David
N.
Spergel about this paper
by co-author Licia Verde
about this paper
Abstract:
"WMAP precision data enable accurate testing of cosmological
models. We find that the emerging standard model of cosmology, a flat
Lambda-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=0.72+/-0.05, Omega(b)h(2)=0.024+/-0.001,
Omega(m)h(2)=0.14+/-0.02, tau=0.166(-0.081)(+0.076), n(s)=0.99+/-0.04, and
sigma(8)=0.9+/-0.1. With parameters fixed only by WMAP data, we can fit
finer scale cosmic microwave background (CMB) measurements and measurements of
large-scale structure (galaxy surveys and the Lyalpha 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. We then fit the model parameters to a combination of WMAP
data with other finer scale CMB experiments (ACBAR and CBI), 2dFGRS
measurements, and Lyalpha forest data to find the model's best-fit
cosmological parameters: h=0.71(-0.03)(+0.04), Omega(b)h(2)=0.0224+/-0.0009,
Omega(m)h(2)=0.135(-0.009)(+0.008), tau=0.17+/-0.06, n(s)(0.05 Mpc(-1))=0.93+/-0.03,
and sigma(8)=0.84+/-0.04. WMAP's best determination of tau=0.17+/-0.04
arises directly from the temperature-polarization (TE) data and not from this
model fit, but they are consistent. These parameters imply that the age of the
universe is 13.7+/-0.2 Gyr. With the Lyalpha forest data, the model favors but
does not require a slowly varying spectral index. The significance of this
running index is sensitive to the uncertainties in the Lyalpha forest.
"By combining WMAP data with other astronomical data, we constrain
the geometry of the universe, Omega(tot)=1.02+/-0.02, and the equation of
state of the dark energy, w<-0.78 (95% confidence limit assuming
w&GE;-1). The combination of WMAP and 2dFGRS data constrains the
energy density in stable neutrinos: &UOmega;(ν)h(2)<0.0072 (95%
confidence limit). For three degenerate neutrino species, this limit implies
that their mass is less than 0.23 eV (95% confidence limit). The WMAP
detection of early reionization rules out warm dark matter."
This 2003 report from Astrophysical
Journal Supplement Series was cited 193 times in current journal
articles indexed in the Thomson Scientific database during July-August 2005.
This latest performance continues
the paper's long run as the most-cited of any non-review paper in any field
published in the last two years. Prior
to the most recent bimonthly count, citations to the paper have accrued as
follows:
May-June 2005: 193 citations
March-April 2005: 120
January-February 2005: 212
November-December 2004: 177
September-October 2004: 174
July-August 2004: 143
May-June 2004: 108
March-April 2004: 107
January-February 2004: 103
November-December 2003: 68
September-0ctober 2003: 29
Total citations to date: 1,573
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