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Planck 2018 results. VIII. Gravitational lensing

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posted on 2023-06-09, 18:47 authored by N Aghanim, Y Akrami, M Ashdown, J Aumont, C Baccigalupi, M Ballardini, A J Banday, R B Barreiro, N Bartolo, S Basak, K Benabed, J P Bernard, M Bersanelli, Julien Carron, Antony LewisAntony Lewis, The Planck Collaboration, others
We present measurements of the cosmic microwave background (CMB) lensing potential using the final Planck 2018 temperature and polarization data. We increase the significance of the detection of lensing in the polarization maps from 5s to 9s. Combined with temperature, lensing is detected at 40s4. We present an extensive set of tests of the robustness of the lensing-potential power spectrum, and construct a minimum-variance estimator likelihood over lensing multipoles 8=L=400. We find good consistency between lensing constraints and the results from the Planck CMB power spectra within the ?CDM?CDM model. Combined with baryon density and other weak priors, the lensing analysis alone constrains s8O0.25m=0.589±0.020 (1s errors). Also combining with baryon acoustic oscillation (BAO) data, we find tight individual parameter constraints, s8=0.811±0.019, H0=67.9+1.2-1.3kms-1Mpc-1, and Om=0.303+0.016-0.018. Combining with Planck CMB power spectrum data, we measure s8 to better than 1% precision, finding s8=0.811±0.006. We find consistency with the lensing results from the Dark Energy Survey, and give combined lensing-only parameter constraints that are tighter than joint results using galaxy clustering. Using Planck cosmic infrared background (CIB) maps we make a combined estimate of the lensing potential over 60% of the sky with considerably more small-scale signal. We demonstrate delensing of the Planck power spectra, detecting a maximum removal of 40% of the lensing-induced power in all spectra. The improvement in the sharpening of the acoustic peaks by including both CIB and the quadratic lensing reconstruction is detected at high significance (abridged).

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Astronomy and Astrophysics

ISSN

0004-6361

Publisher

EDP Sciences

Volume

641

Page range

1-44

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-09-10

First Open Access (FOA) Date

2019-09-10

First Compliant Deposit (FCD) Date

2019-08-28

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