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Planck 2018 results: VII. Isotropy and statistics of the CMB

Y. Akrami 1 M. Ashdown J. Aumont C. Baccigalupi M. Ballardini A. J. Banday 2, * R. B. Barreiro N. Bartolo S. Basak K. Benabed 3 M. Bersanelli 4 P. Bielewicz J. J. Bock 5 J. R. Bond 6 J. Borrill 7 F. R. Bouchet 8 F. Boulanger 9, 10 M. Bucher 11 C. Burigana R. C. Butler E. Calabrese J.-F. Cardoso 12 B. Casaponsa H. C. Chiang L. P. L. Colombo C. Combet 13, 14 D. Contreras B. P. Crill P. de Bernardis 15 G. de Zotti J. Delabrouille 16, 17 J.-M. Delouis 3 E. Di Valentino J. M. Diego O. Doré 18 M. Douspis 19 A. Ducout X. Dupac G. Efstathiou F. Elsner 20 T. A. Enßlin H. K. Eriksen Y. Fantaye R. Fernandez-Cobos F. Finelli M. Frailis A. A. Fraisse E. Franceschi A. Frolov 21 S. Galeotta S. Galli 22 K. Ganga 17 R. T. Génova-Santos M. Gerbino T. Ghosh 19 J. González-Nuevo K. M. Górski 18, * A. Gruppuso J. E. Gudmundsson J. Hamann W. Handley F. K. Hansen D. Herranz E. Hivon 3 Z. Huang 23 A. H. Jaffe W. C. Jones E. Keihänen R. Keskitalo K. Kiiveri J. Kim N. Krachmalnicoff M. Kunz H. Kurki-Suonio G. Lagache 19 J.-M. Lamarre 24 A. Lasenby M. Lattanzi 25 C. R. Lawrence M. Le Jeune 17 F. Levrier 24 M. Liguori P. B. Lilje V. Lindholm M. López-Caniego Y.-Z. Ma J. F. Macías-Pérez 26 G. Maggio D. Maino N. Mandolesi A. Mangilli 2 A. Marcos-Caballero M. Maris P. G. Martin E. Martínez-González * S. Matarrese 27 N. Mauri J. D. Mcewen P. R. Meinhold A. Mennella M. Migliaccio M.-A. Miville-Deschênes 28 D. Molinari A. Moneti 3 L. Montier 2 G. Morgante A. Moss P. Natoli L. Pagano 19 D. Paoletti B. Partridge F. Perrotta V. Pettorino 29 F. Piacentini G. Polenta J.-L. Puget 19 J. P. Rachen M. Reinecke M. Remazeilles 30 A. Renzi G. Rocha 18 C. Rosset 17 G. Roudier 24, 17 J. A. Rubiño-Martín B. Ruiz-Granados L. Salvati 19 M. Savelainen D. Scott 31 E. P. S. Shellard C. Sirignano R. Sunyaev A.-S. Suur-Uski J. A. Tauber D. Tavagnacco M. Tenti L. Toffolatti M. Tomasi 32 T. Trombetti L. Valenziano J. Valiviita B. van Tent 33 P. Vielva * F. Villa N. Vittorio B. D. Wandelt 3 I. K. Wehus A. Zacchei J. P. Zibin A. Zonca
* Corresponding author
1 Astrophysique
LPENS (UMR_8023) - Laboratoire de physique de l'ENS - ENS Paris
Abstract : Analysis of the Planck 2018 data set indicates that the statistical properties of the cosmic microwave background (CMB) temperature anisotropies are in excellent agreement with previous studies using the 2013 and 2015 data releases. In particular, they are consistent with the Gaussian predictions of the ΛCDM cosmological model, yet also confirm the presence of several so-called “anomalies” on large angular scales. The novelty of the current study, however, lies in being a first attempt at a comprehensive analysis of the statistics of the polarization signal over all angular scales, using either maps of the Stokes parameters, Q and U, or the E-mode signal derived from these using a new methodology (which we describe in an appendix). Although remarkable progress has been made in reducing the systematic effects that contaminated the 2015 polarization maps on large angular scales, it is still the case that residual systematics (and our ability to simulate them) can limit some tests of non-Gaussianity and isotropy. However, a detailed set of null tests applied to the maps indicates that these issues do not dominate the analysis on intermediate and large angular scales (i.e., ℓ ≲ 400). In this regime, no unambiguous detections of cosmological non-Gaussianity, or of anomalies corresponding to those seen in temperature, are claimed. Notably, the stacking of CMB polarization signals centred on the positions of temperature hot and cold spots exhibits excellent agreement with the ΛCDM cosmological model, and also gives a clear indication of how Planck provides state-of-the-art measurements of CMB temperature and polarization on degree scales.
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Y. Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, et al.. Planck 2018 results: VII. Isotropy and statistics of the CMB. Astronomy and Astrophysics - A&A, EDP Sciences, 2020, 641, pp.A7. ⟨10.1051/0004-6361/201935201⟩. ⟨cea-02936949⟩

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