Planck 2018 results. VIII. Gravitational lensing
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Planck 2018 results. VIII. Gravitational lensing

  • Author(s): Collaboration, Planck
  • Aghanim, N
  • Akrami, Y
  • Ashdown, M
  • Aumont, J
  • Baccigalupi, C
  • Ballardini, M
  • Banday, AJ
  • Barreiro, RB
  • Bartolo, N
  • Basak, S
  • Benabed, K
  • Bernard, J-P
  • Bersanelli, M
  • Bielewicz, P
  • Bock, JJ
  • Bond, JR
  • Borrill, J
  • Bouchet, FR
  • Boulanger, F
  • Bucher, M
  • Burigana, C
  • Calabrese, E
  • Cardoso, J-F
  • Carron, J
  • Challinor, A
  • Chiang, HC
  • Colombo, LPL
  • Combet, C
  • Crill, BP
  • Cuttaia, F
  • Bernardis, P de
  • Zotti, G de
  • Delabrouille, J
  • Valentino, E Di
  • Diego, JM
  • Doré, O
  • Douspis, M
  • Ducout, A
  • Dupac, X
  • Efstathiou, G
  • Elsner, F
  • Enßlin, TA
  • Eriksen, HK
  • Fantaye, Y
  • Fernandez-Cobos, R
  • Forastieri, F
  • Frailis, M
  • Fraisse, AA
  • Franceschi, E
  • Frolov, A
  • Galeotta, S
  • Galli, S
  • Ganga, K
  • Génova-Santos, RT
  • Gerbino, M
  • Ghosh, T
  • González-Nuevo, J
  • Górski, KM
  • Gratton, S
  • Gruppuso, A
  • Gudmundsson, JE
  • Hamann, J
  • Handley, W
  • Hansen, FK
  • Herranz, D
  • Hivon, E
  • Huang, Z
  • Jaffe, AH
  • Jones, WC
  • Karakci, A
  • Keihänen, E
  • Keskitalo, R
  • Kiiveri, K
  • Kim, J
  • Knox, L
  • Krachmalnicoff, N
  • Kunz, M
  • Kurki-Suonio, H
  • Lagache, G
  • Lamarre, J-M
  • Lasenby, A
  • Lattanzi, M
  • Lawrence, CR
  • Jeune, M Le
  • Levrier, F
  • Lewis, A
  • Liguori, M
  • Lilje, PB
  • Lindholm, V
  • López-Caniego, M
  • Lubin, PM
  • Ma, Y-Z
  • Macías-Pérez, JF
  • Maggio, G
  • Maino, D
  • Mandolesi, N
  • Mangilli, A
  • Marcos-Caballero, A
  • Maris, M
  • Martin, PG
  • Martínez-González, E
  • Matarrese, S
  • Mauri, N
  • McEwen, JD
  • Melchiorri, A
  • Mennella, A
  • Migliaccio, M
  • Miville-Deschênes, M-A
  • Molinari, D
  • Moneti, A
  • Montier, L
  • Morgante, G
  • Moss, A
  • Natoli, P
  • Pagano, L
  • Paoletti, D
  • Partridge, B
  • Patanchon, G
  • Perrotta, F
  • Pettorino, V
  • Piacentini, F
  • Polastri, L
  • Polenta, G
  • Puget, J-L
  • Rachen, JP
  • Reinecke, M
  • Remazeilles, M
  • Renzi, A
  • Rocha, G
  • Rosset, C
  • Roudier, G
  • Rubiño-Martín, JA
  • Ruiz-Granados, B
  • Salvati, L
  • Sandri, M
  • Savelainen, M
  • Scott, D
  • Sirignano, C
  • Sunyaev, R
  • Suur-Uski, A-S
  • Tauber, JA
  • Tavagnacco, D
  • Tenti, M
  • Toffolatti, L
  • Tomasi, M
  • Trombetti, T
  • Valiviita, J
  • Tent, B Van
  • Vielva, P
  • Villa, F
  • Vittorio, N
  • Wandelt, BD
  • Wehus, IK
  • White, M
  • White, SDM
  • Zacchei, A
  • Zonca, A
  • et al.
Abstract

We present measurements of the cosmic microwave background (CMB) lensing potential using the final $\textit{Planck}$ 2018 temperature and polarization data. We increase the significance of the detection of lensing in the polarization maps from $5\,\sigma$ to $9\,\sigma$. Combined with temperature, lensing is detected at $40\,\sigma$. 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 $8 \le L \le 400$. We find good consistency between lensing constraints and the results from the $\textit{Planck}$ CMB power spectra within the $\rm{\Lambda CDM}$ model. Combined with baryon density and other weak priors, the lensing analysis alone constrains $\sigma_8 \Omega_{\rm m}^{0.25}=0.589\pm 0.020$ ($1\,\sigma$ errors). Also combining with baryon acoustic oscillation (BAO) data, we find tight individual parameter constraints, $\sigma_8=0.811\pm0.019$, $H_0=67.9_{-1.3}^{+1.2}\,\text{km}\,\text{s}^{-1}\,\rm{Mpc}^{-1}$, and $\Omega_{\rm m}=0.303^{+0.016}_{-0.018}$. Combining with $\textit{Planck}$ CMB power spectrum data, we measure $\sigma_8$ to better than $1\,\%$ precision, finding $\sigma_8=0.811\pm 0.006$. 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 $\textit{Planck}$ 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 $\textit{Planck}$ 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).

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