NINE-YEAR <i>WILKINSON MICROWAVE ANISOTROPY PROBE</i> ( <i>WMAP</i> ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
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Résumé
We present cosmological parameter constraints based on the final nine-year Wilkinson Microwave Anisotropy Probe ( WMAP ) data, in conjunction with a number of additional cosmological data sets. The WMAP data alone, and in combination, continue to be remarkably well fit by a six-parameter ΛCDM model. When WMAP data are combined with measurements of the high- l cosmic microwave background anisotropy, the baryon acoustic oscillation scale, and the Hubble constant, the matter and energy densities, Ω b h 2 , Ω c h 2 , and Ω Λ , are each determined to a precision of ∼1.5%. The amplitude of the primordial spectrum is measured to within 3%, and there is now evidence for a tilt in the primordial spectrum at the 5σ level, confirming the first detection of tilt based on the five-year WMAP data. At the end of the WMAP mission, the nine-year data decrease the allowable volume of the six-dimensional ΛCDM parameter space by a factor of 68,000 relative to pre- WMAP measurements. We investigate a number of data combinations and show that their ΛCDM parameter fits are consistent. New limits on deviations from the six-parameter model are presented, for example: the fractional contribution of tensor modes is limited to r < 0.13 (95% CL); the spatial curvature parameter is limited to ; the summed mass of neutrinos is limited to ∑ m ν < 0.44 eV (95% CL); and the number of relativistic species is found to lie within N eff = 3.84 ± 0.40, when the full data are analyzed. The joint constraint on N eff and the primordial helium abundance, Y He , agrees with the prediction of standard big bang nucleosynthesis. We compare recent Planck measurements of the Sunyaev–Zel'dovich effect with our seven-year measurements, and show their mutual agreement. Our analysis of the polarization pattern around temperature extrema is updated. This confirms a fundamental prediction of the standard cosmological model and provides a striking illustration of acoustic oscillations and adiabatic initial conditions in the early universe.
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La notice
- Revue
- The Astrophysical Journal Supplement Series
- Thématique
- Cosmology and Gravitation Theories
- Domaine
- Physics and Astronomy
- Établissements canadiens
- Canadian Institute for Theoretical AstrophysicsPerimeter InstituteUniversity of TorontoUniversity of British Columbia
- Organismes subventionnaires
- Science and Technology Facilities Council
- Mots-clés
- CMB cold spotCosmic microwave backgroundPlanckHubble's lawCosmologyAmplitudeNeutrinoCosmic background radiationPrimordial fluctuations
- Résumé présent dans OpenAlex
- oui