"Three-year Wilkinson Microwave Anisotropy Probe
(WMAP) observations: Implications for cosmology,"
by D.N.
Spergel and 21 others, Astrophysical Journal Supplement
Series, 170(2): 377-408, June 2007.

[Authors' affiliations: 13 U.S. and Canadian institutions]

Abstract: "A simple cosmological model with only six
parameters (matter density, Omega(m)h(2), baryon density, Omega(b)h(2),
Hubble constant, H-0, amplitude of fluctuations, sigma(8), optical depth,
tau, and a slope for the scalar perturbation spectrum, n(s)) fits not only
the 3 year WMAP temperature and polarization data, but also
small-scale CMB data, light element abundances, large-scale structure
observations, and the supernova luminosity/distance relationship. Using
WMAP data only, the best-fit values for cosmological parameters
for the power-law flat Lambda cold dark matter (Lambda CDM) model are
(Omega(m)h(2), Omega(b)h(2), h, n(s), tau, sigma(s)) =
(0.1277(-0.0079)(+0.0080),
0.02229 +/- 0.00073, 0.732(-0.032)(+0.031), 0.958 +/- 0.016,0.089 +/-
0.030, 0.761(-0.048)(+0.049)). The 3 year data dramatically shrink the
allowed volume in this six-dimensional parameter space. Assuming that the
primordial fluctuations are adiabatic with a power-law spectrum, the
WMAP data alone require dark matter and favor a spectral index
that is significantly less than the Harrison-Zel'dovich-Peebles
scale-invariant spectrum ( n(s) = 1, r = 0). Adding additional data sets
improves the constraints on these components and the spectral slope. For
power-law models, WMAP data alone puts an improved upper limit on
the tensor-to-scalar ratio, r(0.002) < 0.65 ( 95% CL) and the
combination of WMAP and the lensing-normalized SDSS galaxy survey
implies r(0.002) < 0.30 ( 95% CL). Models that suppress large-scale
power through a running spectral index or a large-scale cutoff in the power
spectrum are a better fit to the WMAP and small-scale CMB data
than the power-law Lambda CDM model; however, the improvement in the fit to
the WMAP data is only Delta(2)(chi) = 3 for 1 extra degree of
freedom. Models with a running-spectral index are consistent with a higher
amplitude of gravity waves. In a flat universe, the combination of
WMAP and the Supernova Legacy Survey (SNLS) data yields a
significant constraint on the equation of state of the dark energy, w =
-0.967(-0.072)(+0.073). If we assume w = -1, then the deviations from the
critical density, Omega(K), are small: the combination of WMAP and
the SNLS data implies Omega(k) = -0.011 +/- 0.012. The combination of
WMAP 3 year data plus the HST Key Project constraint on H-0
implies Omega(k) = -0.014 +/- 0.017 and Omega(Lambda) = 0.716 +/- 0.055.
Even if we do not include the prior that the universe is flat, by combining
WMAP, large-scale structure, and supernova data, we can still put
a strong constraint on the dark energy equation of state, w = -1.08 +/- 0.12.
For a flat universe, the combination of WMAP and other
astronomical data yield a constraint on the sum of the neutrino masses,
Sigma m(nu) < 0.66 eV (95%CL). Consistent with the predictions of
simple inflationary theories, we detect no significant deviations from
Gaussianity in the CMB maps using Minkowski functionals, the bispectrum,
trispectrum, and a new statistic designed to detect large-scale
anisotropies in the fluctuations."

This 2007 report from Astrophysical Journal Supplement Series was
cited 201 times in current journal articles
indexed by Clarivate during March-April 2008. For the fourth
consecutive bimonthly period, this paper scores as the most-cited physics
report (excluding reviews) published in the last two years. Prior to the
most recent two-month count, citations to the paper have accrued as
follows:

SOURCE:
Hot Papers
Database (Included with a subscription to the print newsletter
Science
Watch^{®}, available from the
Research Services
Group of
Thomson
Reuters. Packaged on a CD that is mailed
with each Science Watch issue, the Hot Papers
Database contains data on hundreds of highly cited papers published during
the last two years. User interface permits searching by author,
organization, journal, field, and more. Total citations, as well as
citations accrued during successive bimonthly periods, can be assessed and
graphed. An updated CD containing the most recent bimonthly data is mailed
with every new issue of Science Watch, six times a
year. The CD also includes an electronic version of the Science
Watch issue in HTML format, for personal desktop
access.