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Title: Planck 2018 results. VII. Isotropy and Statistics of the CMB

Journal Article · · Astronomy and Astrophysics
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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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
Planck Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1676383
Journal Information:
Astronomy and Astrophysics, Vol. 641; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Re-evaluating evidence for Hawking points in the CMB journal March 2020
Re-evaluating evidence for Hawking points in the CMB text January 2019
The flickering nuclear activity of Fornax A journal January 2020
CMB foreground measurements through broad-band radio spectro-polarimetry: prospects of the SKA-MPG telescope journal June 2019
Local Bubble contribution to the 353-GHz dust polarized emission journal November 2019
A physical approach to modelling large-scale galactic magnetic fields journal March 2019
Extreme starlight polarization in a region with highly polarized dust emission journal April 2019
Reionization optical depth determination from Planck HFI data with ten percent accuracy journal March 2020
Gas shells and magnetic fields in the Orion-Eridanus superbubble journal October 2019
Link between E – B polarization modes and gas column density from interstellar dust emission journal November 2019

Figures / Tables (74)

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmology: observations
cosmic background radiation
polarization
methods: data analysis
methods: statistical