Planck 2015 results

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016-10-01
Department
Cardiff University
Université Paris 13
Centre National de la Recherche Scientifique (CNRS)
Kavli Institute for Cosmology Cambridge
International School for Advanced Studies
IRAP
Universidad de Cantabria
Sapienza University of Rome
Instituto Carlos I de Física Teórica y Computacional
Institut national de physique nucléaire et de physique des particules
Istituto Nazionale di Astrofisica (INAF)
Jet Propulsion Laboratory
University of Manchester
University of Oviedo
University of Toronto
University of California Berkeley
Universite Paris Sorbonne - Paris IV
Université Sorbonne Paris Cité
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
University of Oxford
Telecom ParisTech
Princeton University
Niels Bohr Institute
Stanford University
Imperial College London
Université Paris-Sud
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
Jodrell Bank Centre for Astrophysics
Università La Sapienza
Urbanización Villafranca Del Castillo
University of Cambridge
Max-Planck-Institut für Astrophysik
University of Oslo
Osservatorio Astronomico di Trieste
University of Chicago
University of Warsaw
Stockholm University
McGill University
Danmarks Tekniske Universitet
Florida State University
University of Helsinki
Lawrence Berkeley National Laboratory
Department of Radio Science and Engineering
Centro de Gestão e Estudos Estratégicos
CERN
University of California Santa Barbara
University College London
California Institute of Technology
University of Nottingham
National University of Ireland, Galway
RAS - P.N. Lebedev Physics Institute
Institut für Theoretische Astrophysik
University of Southern California
University of Alberta
Osservatorio Astronomico di Roma
Institute for Space Sciences
Instituto de Astrofísica de Canarias
Università di Roma Tor Vergata
University of British Columbia
Special Astrophysical Observatory of the Russian Academy of Sciences
European Space Research and Technology Centre
Università degli Studi eCampus
University of Geneva
Trinity College Dublin
Université Paris Diderot
Major/Subject
Mcode
Degree programme
Language
en
Pages
21
Series
Astronomy and Astrophysics, Volume 594
Abstract
Maps of cosmic microwave background (CMB) temperature and polarization from the 2015 release of Planck data provide the highestquality full-sky view of the surface of last scattering available to date. This enables us to detect possible departures from a globally isotropic cosmology. We present the first searches using CMB polarization for correlations induced by a possible non-trivial topology with a fundamental domain that intersects, or nearly intersects, the last-scattering surface (at comoving distance χrec), both via a direct scan for matched circular patterns at the intersections and by an optimal likelihood calculation for specific topologies. We specialize to flat spaces with cubic toroidal (T3) and slab (T1) topologies, finding that explicit searches for the latter are sensitive to other topologies with antipodal symmetry. These searches yield no detection of a compact topology with a scale below the diameter of the last-scattering surface. The limits on the radius i of the largest sphere inscribed in the fundamental domain (at log-likelihood ratio Δ >-5 relative to a simply-connected flat Planck best-fit model) are: i > 0.97 χrec for the T3 cubic torus; and i > 0.56 χrec for the T1 slab. The limit for the T3 cubic torus from the matched-circles search is numerically equivalent, i > 0.97 χrec at 99% confidence level from polarization data alone. We also perform a Bayesian search for an anisotropic global Bianchi VIIh geometry. In the non-physical setting, where the Bianchi cosmology is decoupled from the standard cosmology, Planck temperature data favour the inclusion of a Bianchi component with a Bayes factor of at least 2.3 units of log-evidence. However, the cosmological parameters that generate this pattern are in strong disagreement with those found from CMB anisotropy data alone. Fitting the induced polarization pattern for this model to the Planck data requires an amplitude of-0.10 ± 0.04 compared to the value of + 1 if the model were to be correct. In the physically motivated setting, where the Bianchi parameters are coupled and fitted simultaneously with the standard cosmological parameters, we find no evidence for a Bianchi VIIh cosmology and constrain the vorticity of such models to (ω/H)0 < 7.6 × 10-10 (95% CL).
Description
Keywords
Cosmic background radiation, Cosmological parameters, Cosmology: observations, Gravitation, Methods: data analysis, Methods: statistical
Other note
Citation
Ade , P A R , Aghanim , N , Arnaud , M , Ashdown , M , Aumont , J , Baccigalupi , C , Banday , A J , Barreiro , R B , Bartolo , N , Basak , S , Battaner , E , Benabed , K , Benoît , A , Benoit-Lévy , A , Bernard , J P , Bersanelli , M , Bielewicz , P , Bock , J J , Bonaldi , A , Bonavera , L , Bond , J R , Borrill , J , Bouchet , F R , Bucher , M , Burigana , C , Butler , R C , Calabrese , E , Cardoso , J F , Catalano , A , Challinor , A , Chamballu , A , Chiang , H C , Christensen , P R , Church , S , Clements , D L , Colombi , S , Colombo , L P L , Combet , C , Couchot , F , Coulais , A , Crill , B P , Curto , A , Cuttaia , F , Danese , L , Davies , R D , Davis , R J , De Bernardis , P , De Rosa , A , De Zotti , G , Delabrouille , J , Désert , F X , Diego , J M , Dole , H , Donzelli , S , Doré , O , Douspis , M , Ducout , A , Dupac , X , Efstathiou , G , Elsner , F , Enßlin , T A , Eriksen , H K , Feeney , S , Fergusson , J , Finelli , F , Forni , O , Frailis , M , Fraisse , A A , Franceschi , E , Frejsel ,A , Galeotta , S , Galli , S , Ganga , K , Giard , M , Giraud-Héraud , Y , Gjerløw , E , González-Nuevo , J , Górski , K M , Gratton , S , Gregorio , A , Gruppuso , A , Gudmundsson , J E , Hansen , F K , Hanson , D , Harrison , D L , Henrot-Versillé , S , Hernández-Monteagudo , C , Herranz , D , Hildebrandt , S R , Hivon , E , Hobson , M , Holmes , W A , Hornstrup , A , Hovest , W , Huffenberger , K M , Hurier , G , Jaffe , A H , Jaffe , T R , Jones , W C , Juvela , M , Keihänen , E , Keskitalo , R , Kisner , T S , Knoche , J , Kunz , M , Kurki-Suonio , H , Lagache , G , Lähteenmäki , A , Lamarre , J M , Lasenby , A , Lattanzi , M , Lawrence , C R , Leonardi , R , Lesgourgues , J , Levrier , F , Liguori , M , Lilje , P B , Linden-Vørnle , M , López-Caniego , M , Lubin , P M , Maciás-Pérez , J F , Maggio , G , Maino , D , Mandolesi , N , Mangilli , A , Maris , M , Martin , P G , Martínez-González , E , Masi , S , Matarrese , S , Mcewen , J D , Mcgehee , P , Meinhold , P R , Melchiorri , A , Mendes , L , Mennella , A , Migliaccio , M , Mitra , S , Miville-Deschênes , M A , Moneti , A , Montier , L , Morgante , G , Mortlock , D , Moss , A , Munshi , D , Murphy , J A , Naselsky , P , Nati , F , Natoli , P , Netterfield , C B , Nørgaard-Nielsen , H U , Noviello , F , Novikov , D , Novikov , I , Oxborrow , C A , Paci , F , Pagano , L , Pajot , F , Paoletti , D , Pasian , F , Patanchon , G , Peiris , H V , Perdereau , O , Perotto , L , Perrotta , F , Pettorino , V , Piacentini , F , Piat , M , Pierpaoli , E , Pietrobon , D , Plaszczynski , S , Pogosyan , D , Pointecouteau , E , Polenta , G , Popa , L , Pratt , G W , Prézeau , G , Prunet , S , Puget , J L , Rachen , J P , Rebolo , R , Reinecke , M , Remazeilles , M , Renault , C , Renzi , A , Ristorcelli , I , Rocha , G , Rosset , C , Rossetti , M , Roudier , G , Rowan-Robinson , M , Rubinõ-Martín , J A , Rusholme , B , Sandri , M , Santos , D , Savelainen , M , Savini , G , Scott , D , Seiffert , M D , Shellard , E P S , Spencer , L D , Stolyarov , V , Stompor , R , Sudiwala , R , Sutton , D , Suur-Uski , A S , Sygnet , J F , Tauber , J A , Terenzi , L , Toffolatti , L , Tomasi , M , Tristram , M , Tucci , M , Tuovinen , J , Valenziano , L , Valiviita , J , Van Tent , F , Vielva , P , Villa , F , Wade , L A , Wandelt , B D , Wehus , I K , Yvon , D , Zacchei , A & Zonca , A 2016 , ' Planck 2015 results : XVIII. Background geometry and topology of the Universe ' , Astronomy and Astrophysics , vol. 594 , A18 . https://doi.org/10.1051/0004-6361/201525829