<i>Planck</i>2015 results

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 &lt; 0.23 eV. Spatial curvature is found to be |Omega_K| &lt; 0.005. For LCDM we find a limit on the tensor-to-scalar ratio of r &lt;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 &lt; 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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Affiliated Institutions

• University of California, Berkeley US
• Nordic Institute for Theoretical Physics SE
• Université Paris Cité FR
• Jet Propulsion Laboratory US
• Institut National de Physique Nucléaire et de Physique des Particules FR
• Scuola Internazionale Superiore di Studi Avanzati IT
• University of Manchester GB
• Sorbonne Université FR
• University of Padua IT
• California Institute of Technology US
• AlbaNova SE
• University College London GB
• University of Toronto CA
• National Taiwan University TW
• Roche (France) FR
• Istituto Nazionale di Fisica Nucleare, Sezione di Bologna IT
• University of Oslo
• European Space Astronomy Centre ES
• Télécom Paris FR
• Ludwig-Maximilians-Universität München DE
• CEA Paris-Saclay FR
• Sorbonne Paris Cité FR
• Centre National de la Recherche Scientifique FR
• Universidad de Oviedo ES
• Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères FR
• Instituto de Física de Cantabria ES
• Institut d'Astrophysique Spatiale FR
• Osservatorio Astronomico di Padova IT
• Imperial College London GB
• Universidad de Cantabria ES
• Astrophysique, Instrumentation et Modélisation FR
• European Organization for Nuclear Research CH
• McGill University CA
• Istituto Nazionale di Fisica Nucleare, Sezione di Padova IT
• University of Trieste IT
• The University of Sydney AU
• Cardiff University GB
• Université Paris-Saclay FR
• Institut de Planétologie et d'Astrophysique de Grenoble FR
• Trieste Astronomical Observatory IT
• Commissariat à l'Énergie Atomique et aux Énergies Alternatives FR
• Universidad de Granada ES
• University of Ferrara IT
• Université Toulouse III - Paul Sabatier FR
• University of Milan IT
• Lawrence Berkeley National Laboratory US
• Nicolaus Copernicus Astronomical Center PL
• University of Cambridge GB
• Université Paris-Sud FR
• Institut Universitaire de France FR
• Laboratoire Traitement et Communication de l’Information FR
• Shahid Beheshti University IR
• University of Oxford GB
• Infrared Processing and Analysis Center US
• University of KwaZulu-Natal ZA
• Centro de Estudios de Física del Cosmos de Aragón ES
• Stockholm University SE
• Université Grenoble Alpes FR
• Délégation Paris 7 FR
• Istituto Nazionale di Fisica Nucleare, Sezione di Trieste IT
• University of Chicago US
• Max Planck Institute for Astrophysics DE
• Stanford University US
• Institut de Recherche sur les Lois Fondamentales de l'Univers FR
• Institut d'Astrophysique de Paris FR
• Princeton University US
• Bloomberg (United States) US
• Sapienza University of Rome IT
• Observatoire de Paris FR
• University of Warsaw PL
• University of Southern California US
• Johns Hopkins University US
• Université Fédérale de Toulouse Midi-Pyrénées FR
• Istituto Nazionale di Fisica Nucleare IT
• National Institute for Astrophysics IT

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