For refcode 2003ApJS..148..175S: Retrieve 7 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by American Astronomical Society.
Reproduced by permission
2003ApJS..148..175S
FirstYear Wilkinson Microwave Anisotropy Probe (WMAP) Observations:
Determination of Cosmological Parameters
D. N. Spergel, L. Verde, H. V. Peiris, E. Komatsu, M. R. Nolta, C. L.
Bennett, M. Halpern, G. Hinshaw, N. Jarosik, A. Kogut, M. Limon, S. S.
Meyer, L. Page, G. S. Tucker, J. L. Weiland, E. Wollack, and E. L. Wright
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 scaleinvariant adiabatic
Gaussian fluctuations, fits the WMAP data. For the WMAP data only, the
bestfit 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^+0.076^_0.071_, 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 largescale structure (galaxy surveys and the Ly{alpha}
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 Ly{alpha} forest data to find the
model's bestfit cosmological parameters: h=0.71^+0.04^_0.03_,
{OMEGA}_b_h^2^=0.0224+/0.0009, {OMEGA}_m_h^2^=0.135^+0.008^_0.009_,
{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 temperaturepolarization (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 Ly{alpha} 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
Ly{alpha} 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 >= 1). The combination of WMAP and 2dFGRS data constrains the
energy density in stable neutrinos: {OMEGA}_{nu}_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.
Keywords: Cosmology: Cosmic Microwave Background, Cosmology: Cosmological
Parameters Cosmology: Observations, Cosmology: Early Universe
Retrieve 7 NED objects in this reference. Please click here for ADS abstract
