<i>Planck</i>2015 results
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Abstract
We present results based on full-mission Planck observations of temperature and polarization anisotropies of the CMB. These data are consistent with the six-parameter inflationary LCDM cosmology. From the Planck temperature and lensing data, for this cosmology we find a Hubble constant, H0= (67.8 +/- 0.9) km/s/Mpc, a matter density parameter Omega_m = 0.308 +/- 0.012 and a scalar spectral index with n_s = 0.968 +/- 0.006. (We quote 68% errors on measured parameters and 95% limits on other parameters.) Combined with Planck temperature and lensing data, Planck LFI polarization measurements lead to a reionization optical depth of tau = 0.066 +/- 0.016. Combining Planck with other astrophysical data we find N_ eff = 3.15 +/- 0.23 for the effective number of relativistic degrees of freedom and the sum of neutrino masses is constrained to < 0.23 eV. Spatial curvature is found to be |Omega_K| < 0.005. For LCDM we find a limit on the tensor-to-scalar ratio of r <0.11 consistent with the B-mode constraints from an analysis of BICEP2, Keck Array, and Planck (BKP) data. Adding the BKP data leads to a tighter constraint of r < 0.09. We find no evidence for isocurvature perturbations or cosmic defects. The equation of state of dark energy is constrained to w = -1.006 +/- 0.045. Standard big bang nucleosynthesis predictions for the Planck LCDM cosmology are in excellent agreement with observations. We investigate annihilating dark matter and deviations from standard recombination, finding no evidence for new physics. The Planck results for base LCDM are in agreement with BAO data and with the JLA SNe sample. However the amplitude of the fluctuations is found to be higher than inferred from rich cluster counts and weak gravitational lensing. Apart from these tensions, the base LCDM cosmology provides an excellent description of the Planck CMB observations and many other astrophysical data sets.
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The record
- Venue
- Astronomy and Astrophysics
- Topic
- Cosmology and Gravitation Theories
- Field
- Physics and Astronomy
- Canadian institutions
- University of British ColumbiaMcGill UniversityUniversity of Toronto
- Funders
- Fundação para a Ciência e a TecnologiaInstitut National de Physique Nucléaire et de Physique des ParticulesMinistério da Ciência, Tecnologia e Ensino SuperiorCentre National de la Recherche ScientifiqueScience and Technology Facilities CouncilTekesCentre National d’Etudes SpatialesUniversité de GenèvePartnership for Advanced Computing in Europe AISBLEuropean CommissionScience Foundation IrelandUK Space AgencyUniversity of CambridgeAgence Nationale de la RechercheChina Scholarship CouncilNational Aeronautics and Space AdministrationEuropean Space AgencyMax-Planck-Gesellschaft
- Keywords
- PhysicsPlanckCosmic microwave backgroundAstrophysicsHubble's lawCosmologyDark energyReionizationBig Bang nucleosynthesisPlanck energySpectral indexOmegaCosmic background radiationGravitational lensParticle physicsNucleosynthesisAstronomyAnisotropyRedshiftQuantum mechanicsQuantum gravitySpectral lineStarsGalaxy
- Has abstract in OpenAlex
- yes