Planck 2015 results

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016-10-01
Department
Cardiff University
CNRS/IN2P3
Service d'Astrophysique CEA
Kavli Institute for Cosmology Cambridge
University of Cambridge
International School for Advanced Studies
IRAP
Universite de Toulouse
Instituto de Física de Cantabria (CSIC-Universidad de Cantabria)
Jet Propulsion Laboratory, California Institute of Technology
AstroParticule et Cosmologie
Università Degli Studi di Padova
Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
University of Granada
University of Manchester
UMR7095
CNRS
University College London
INAF/IASF Milano
Università degli Studi di Milano
Nicolaus Copernicus Astronomical Center
California Institute of Technology
University of Toronto
University of California at Berkeley
Lawrence Berkeley National Laboratory
Universite Paris Sorbonne - Paris IV
Institut d 'Astrophysique de Paris
INAF/IASF Bologna
Università di Ferrara
INFN, Sezione di Bologna
University of Oxford
UMR 5141
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
Laboratoire AIM, Service d’Astrophysique, DSM\IRFU, CEA\Saclay
Institut d'Astrophysique Spatiale
Princeton University
University of KwaZulu-Natal
Johns Hopkins University
Niels Bohr Institute
Stanford University
Imperial College London
University of Southern California
Universidad de Cantabria
Università La Sapienza
INAF, Osservatorio Astronomico di Padova
UMR 7095
Ludwig Maximilian University of Munich
Max-Planck-Institut für Astrophysik
Institut Universitaire de France
European Space Agcy, European Space Agency, ESAC, Planck Sci Off
University of Oslo
Shahid Beheshti University
Osservatorio Astronomico di Trieste
University of Chicago
National Taiwan University
Stockholms universitet
NORDITA
University of Warsaw
Università Degli Studi di Trieste
Istituto Nazionale di Fisica Nucleare
CERN
University of Sydney
McGill University
Centro de Estudios de la Física del Cosmos de Aragón
Technical University of Denmark
Florida State University
University of Helsinki
European Southern Observatory Santiago
ALMA Santiago Central Offices
University of California
Université de Genève
African Institute for Mathematical Sciences
Helsinki Institute of Physics
Aix Marseille Universite
Department of Radio Science and Engineering
Metsähovi Radio Observatory
INFN, Sezione di Ferrara
Centro de Gestão e Estudos Estratégicos
RWTH Aachen University
University of Sussex
INFN, Sezione di Padova
University of California, Santa Barbara
INAF, Osservatorio Astronomico di Trieste
Universite Paris-Sud
INFN, Sezione di Roma 1
University of Heidelberg
Gran Sasso Science Institute
CEA Saclay, CEA, DSM Irfu SPP
Inter-University Centre for Astronomy and Astrophysics
CNRS Centre National de la Recherche Scientifique
University of Nottingham
National University of Ireland
University of Copenhagen
ASI Science Data Center
RAS - Pn Lebedev Physics Institute
Haverford College
INAF, Osservatorio Astronomico di Roma
Institute for Space Sciences
Université Pierre and Marie Curie
Radboud University Nijmegen
Universities Space Research Association
Instituto Astrofisico de Canarias
CSIC
Universidad de La Laguna
Università di Roma Tor Vergata
Department of Applied Physics
ROTA – Topological superfluids
University of British Columbia
Special Astrophysical Observatory, Russian Academy of Sciences
Kazan Federal University
Space Research Institute, Russian Academy of Sciences
ESTEC - European Space Research and Technology Centre
Università degli Studi e-Campus
Universidad de Oviedo
Trinity College Dublin
INAF, Osservatorio Astrofisico di Catania
University of Illinois at Urbana-Champaign
Major/Subject
Mcode
Degree programme
Language
en
Pages
63
Series
Astronomy and Astrophysics, Volume 594
Abstract
This paper presents cosmological results based on full-mission Planck observations of temperature and polarization anisotropies of the cosmic microwave background (CMB) radiation. Our results are in very good agreement with the 2013 analysis of the Planck nominal-mission temperature data, but with increased precision. The temperature and polarization power spectra are consistent with the standard spatially-flat 6-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations (denoted "base ΛCDM" in this paper). From the Planck temperature data combined with Planck lensing, for this cosmology we find a Hubble constant, H0 = (67.8 ± 0.9) km s-1Mpc-1, a matter density parameter Ωm = 0.308 ± 0.012, and a tilted scalar spectral index with ns = 0.968 ± 0.006, consistent with the 2013 analysis. Note that in this abstract we quote 68% confidence limits on measured parameters and 95% upper limits on other parameters. We present the first results of polarization measurements with the Low FrequencyInstrument at large angular scales. Combined with the Planck temperature and lensing data, these measurements give a reionization optical depth of τ = 0.066 ± 0.016, corresponding to a reionization redshift of \hbox{$z-{\rm re}=8.8{+1.7}-{-1.4}$}. These results are consistent with those from WMAP polarization measurements cleaned for dust emission using 353-GHz polarization maps from the High Frequency Instrument. We find no evidence for any departure from base ΛCDM in the neutrino sector of the theory; for example, combining Planck observations with other astrophysical data we find Neff = 3.15 ± 0.23 for the effective number of relativistic degrees of freedom, consistent with the value Neff = 3.046 of the Standard Model of particle physics. The sum of neutrino masses is constrained to â'mν < 0.23 eV. The spatial curvature of our Universe is found to be very close to zero, with | ΩK | < 0.005. Adding a tensor component as a single-parameter extension to base ΛCDM we find an upper limit on the tensor-to-scalar ratio of r0.002< 0.11, consistent with the Planck 2013 results and consistent with the B-mode polarization constraints from a joint analysis of BICEP2, Keck Array, and Planck (BKP) data. Adding the BKP B-mode data to our analysis leads to a tighter constraint of r0.002 < 0.09 and disfavours inflationarymodels with a V(φ) φ2 potential. The addition of Planck polarization data leads to strong constraints on deviations from a purely adiabatic spectrum of fluctuations. We find no evidence for any contribution from isocurvature perturbations or from cosmic defects. Combining Planck data with other astrophysical data, including Type Ia supernovae, the equation of state of dark energy is constrained to w =-1.006 ± 0.045, consistent with the expected value for a cosmological constant. The standard big bang nucleosynthesis predictions for the helium and deuterium abundances for the best-fit Planck base ΛCDM cosmology are in excellent agreement with observations. We also constraints on annihilating dark matter and onpossible deviations from the standard recombination history. In neither case do we find no evidence for new physics. The Planck results for base ΛCDM are in good agreement with baryon acoustic oscillation data and with the JLA sample of Type Ia supernovae. However, as in the 2013 analysis, the amplitude of the fluctuation spectrum is found to be higher than inferred from some analyses of rich cluster counts and weak gravitational lensing. We show that these tensions cannot easily be resolved with simple modifications of the base ΛCDM cosmology. Apart from these tensions, the base ΛCDM cosmology provides an excellent description of the Planck CMB observations and many other astrophysical data sets.
Description
Keywords
Cosmic background radiation, Cosmological parameters, Cosmology: observations, Cosmology: theory, Astronomy and Astrophysics, Space and Planetary Science, 115 Astronomy and space science
Other note
Citation
Planck Collaboration 2016 , ' Planck 2015 results : XIII. Cosmological parameters ' Astronomy and Astrophysics , vol 594 , A13 . DOI: 10.1051/0004-6361/201525830