"Five-year Wilkinson Microwave Anisotropy
Probe observations: Cosmological interpretation," by E.
Komatsu and 18 others, Astrophysical Journal Supplement Series,
180(2): 330-76, February 2009.
From the abstract: "The Wilkinson Microwave Anisotropy
Probe (WMAP) 5-year data provide stringent limits on
deviations from the minimal, six-parameter lambda cold dark matter model.
We report these limits and use them to constrain the physics of cosmic
inflation via Gaussianity, adiabaticity, the power spectrum of primordial
fluctuations, gravitational waves, and spatial curvature. We also constrain
models of dark energy via its equation of state, parity-violating
interaction, and neutrino properties, such as mass and the number of
species. We detect no convincing deviations from the minimal model....With
the WMAP data combined with BAO and SN, we find the limit on the
tensor-to-scalar ratio of r < 0.22 (95% CL), and that n(s) > 1 is
disfavored even when gravitational waves are included, which constrains the
models of inflation that can produce significant gravitational waves, such
as chaotic or power-law inflation models, or a blue spectrum, such as
hybrid inflation models. We obtain tight, simultaneous limits on the
(constant) equation of state of dark energy and the spatial curvature of
the universe: -0.14 < 1 + w(0) < 0.12 (95% CL) and -0.0179 <
Omega(k) < 0.0081 (95% CL). We provide a set of "WMAP distance
priors," to test a variety of dark energy models with spatial curvature. We
test a time-dependent w with a present value constrained as -0.33 < 1 +
w(0) < 0.21 (95% CL). Temperature and dark matter fluctuations are found
to obey the adiabatic relation to within 8.9% and 2.1% for the axion-type
and curvaton-type dark matter, respectively. The power spectra of TB and EB
correlations constrain a parity-violating interaction, which rotates the
polarization angle and converts E to B. The polarization angle could not be
rotated more than -5 degrees.9 < Delta alpha < 2 degrees.4 (95% CL)
between the decoupling and the present epoch. We find the limit on the
total mass of massive neutrinos of Sigma m(v) < 0.67 eV (95% CL), which
is free from the uncertainty in the normalization of the large-scale
structure data. The number of relativistic degrees of freedom (dof),
expressed in units of the effective number of neutrino species, is
constrained as N-eff = 4.4 +/- 1.5 (68%), consistent with the standard
value of 3.04. Finally, quantitative limits on physically-motivated
primordial non-Gaussianity parameters are -9 < f(NL)(local) < 111
(95% CL) and -151 < f(NL)(equil) < 253 (95% CL) for the local and
equilateral models, respectively."
This 2009 report from Astrophysical Journal Supplement Series was
cited 143 times in current journal articles
indexed by Clarivate during May-June 2009. No other physics paper
published in the last two years, aside from reviews, garnered a higher
citation total during that two-month period—an impressive achievement
for a report in its first year of publication. Prior to the most recent
bimonthly count, citations to the paper have accrued as follows:
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