Planck 2015 results - XIII. Cosmological parameters

摘要: This paper presents cosmological results based on full-mission Planck observations of temperature and polarization anisotropies the cosmic microwave background (CMB) radiation. Our are in very good agreement with 2013 analysis nominal-mission data, but increased precision. The power spectra consistent standard spatially-flat 6-parameter ΛCDM cosmology a power-law spectrum adiabatic scalar perturbations (denoted “base ΛCDM” this paper). From data combined lensing, for we find Hubble constant, H0 = (67.8 ± 0.9) km s-1Mpc-1, matter density parameter Ωm 0.308 0.012, tilted spectral index ns 0.968 0.006, analysis. Note that abstract quote 68% confidence limits measured parameters 95% upper other parameters. We present first measurements Low Frequency Instrument at large angular scales. Combined lensing these give reionization optical depth τ 0.066 0.016, corresponding to redshift . These those from WMAP cleaned dust emission using 353-GHz maps High Instrument. no evidence any departure base neutrino sector theory; example, combining astrophysical Neff 3.15 0.23 effective number relativistic degrees freedom, value 3.046 Standard Model particle physics. sum masses is constrained ∑ mν < eV. spatial curvature our Universe found be close zero, | ΩK 0.005. Adding tensor component as single-parameter extension an limit tensor-to-scalar ratio r0.002< 0.11, B-mode constraints joint BICEP2, Keck Array, (BKP) data. BKP leads tighter constraint r0.002 0.09 disfavours inflationarymodels V(φ) ∝ φ2 potential. addition strong deviations purely fluctuations. contribution isocurvature or defects. Combining including Type Ia supernovae, equation state dark energy w −1.006 0.045, expected constant. big bang nucleosynthesis predictions helium deuterium abundances best-fit excellent observations. also annihilating possible recombination history. In neither case do new baryon acoustic oscillation JLA sample supernovae. However, analysis, amplitude fluctuation higher than inferred some analyses rich cluster counts weak gravitational lensing. show tensions cannot easily resolved simple modifications cosmology. Apart tensions, provides description CMB many sets.