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

Yashar 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 M. Bucher 9 C. Burigana R. C. Butler E. Calabrese J.-F. Cardoso 10 B. Casaponsa H. C. Chiang L. P. L. Colombo C. Combet 11, 12 D. Contreras B. P. Crill P. de Bernardis 13 G. de Zotti J. Delabrouille 14, 15 J.-M. Delouis 3 E. Di Valentino J. M. Diego O. Doré 16 M. Douspis 17 A. Ducout X. Dupac G. Efstathiou F. Elsner 18 T. A. Ensslin H. K. Eriksen Y. Fantaye R. Fernandez-Cobos F. Finelli M. Frailis A. A. Fraisse E. Franceschi A. Frolov 19 S. Galeotta S. Galli 20 K. Ganga 15 R. T. Génova-Santos M. Gerbino T. Ghosh 17 J. González-Nuevo K. M. Górski 16, * A. Gruppuso J. E. Gudmundsson J. Hamann W. Handley F. K. Hansen D. Herranz E. Hivon 3 Z. Huang 21 A. H. Jaffe W. C. Jones E. Keihänen R. Keskitalo K. Kiiveri J. Kim N. Krachmalnicoff M. Kunz H. Kurki-Suonio G. Lagache 17 J.-M. Lamarre 22 A. Lasenby M. Lattanzi 23 C. R. Lawrence M. Le Jeune 15 F. Levrier 22 M. Liguori P. B. Lilje V. Lindholm M. López-Caniego Y.-Z. Ma J. F. Macías-Pérez 24 G. Maggio D. Maino N. Mandolesi A. Mangilli 2 A. Marcos-Caballero M. Maris P. G. Martin E. Martínez-González * S. Matarrese 25 N. Mauri J. D. Mcewen P. R. Meinhold A. Mennella M. Migliaccio M.-A. Miville-Deschênes 26 D. Molinari A. Moneti 3 L. Montier 2 G. Morgante A. Moss P. Natoli L. Pagano 17 D. Paoletti B. Partridge F. Perrotta V. Pettorino 27 F. Piacentini G. Polenta J.-L. Puget 17 J. P. Rachen M. Reinecke M. Remazeilles 28 A. Renzi G. Rocha 16 C. Rosset 15 G. Roudier 22, 15 J. A. Rubiño-Martín B. Ruiz-Granados L. Salvati 17 M. Savelainen D. Scott 29 E. P. S. Shellard C. Sirignano R. Sunyaev A.-S. Suur-Uski J. A. Tauber D. Tavagnacco M. Tenti L. Toffolatti M. Tomasi 30 T. Trombetti L. Valenziano J. Valiviita B. van Tent 31 P. Vielva * Francesca Villa N. Vittorio B. D. Wandelt 3 I. K. Wehus A. Zacchei J. P. Zibin A. Zonca 
* Corresponding author
1 Astrophysique
LPENS - 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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Yashar 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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