Planck 2018 results. VIII. Gravitational lensing
Abstract
We present measurements of the cosmic microwave background (CMB) lensing potential using the final Planck 2018 temperature and polarization data. Using polarization maps filtered to account for the noise anisotropy, we increase the significance of the detection of lensing in the polarization maps from 5σ to 9σ. Combined with temperature, lensing is detected at 40σ. 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 (extending the range to lower L compared to 2015), which we use to constrain cosmological parameters. We find good consistency between lensing constraints and the results from the Planck CMB power spectra within the ΛCDM model. Combined with baryon density and other weak priors, the lensing analysis alone constrains σ₈Ω_m^(0.25) = 0.589 ± 0.020 (1σ errors). Also combining with baryon acoustic oscillation data, we find tight individual parameter constraints, σ₈ = 0.811 ± 0.019, H₀ = 67.9_(−1.3)^(+1.2) km s⁻¹ Mpc⁻¹, and Ω_m = 0.303_(−0.018)^(+0.016). Combining with Planck CMB power spectrum data, we measure σ₈ to better than 1% precision, finding σ₈ = 0.811 ± 0.006. CMB lensing reconstruction data are complementary to galaxy lensing data at lower redshift, having a different degeneracy direction in σ₈ − Ω_m space; 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 the Planck cosmic infrared background (CIB) maps as an additional tracer of high-redshift matter, we make a combined Planck-only estimate of the lensing potential over 60% of the sky with considerably more small-scale signal. We additionally demonstrate delensing of the Planck power spectra using the joint and individual lensing potential estimates, 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.
Additional Information
© 2020 ESO. Article published by EDP Sciences. Received 17 July 2018; Accepted 18 July 2019; Published online 11 September 2020. We thank Duncan Hanson for all his work on the previous Planck analyses without which the current work would not have been possible. We thank the DES collaboration for sharing their data. Some of the results in this paper have been derived using the HEALPix package. Support is acknowledged from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement No. [616170], and from the Science and Technology Facilities Council [grant numbers ST/L000652/1 and ST/N000927/1, respectively]. The Planck Collaboration acknowledges the support of: ESA; CNES, and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MINECO, JA, and RES (Spain); Tekes, AoF, and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); ERC and PRACE (EU). A description of the Planck Collaboration and a list of its members, indicating which technical or scientific activities they have been involved in, can be found at https://www.cosmos.esa.int/web/planck/planck-collaboration.Attached Files
Published - aa33886-18.pdf
Submitted - 1807.06210.pdf
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Additional details
- Eprint ID
- 98995
- Resolver ID
- CaltechAUTHORS:20191001-135625979
- European Research Council (ERC)
- 616170
- Science and Technology Facilities Council (STFC)
- ST/L000652/1
- Science and Technology Facilities Council (STFC)
- ST/N000927/1
- European Space Agency (ESA)
- Centre National d'Études Spatiales (CNES)
- Centre National de la Recherche Scientifique (CNRS)
- Institut national des sciences de l'Univers (INSU)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Agenzia Spaziale Italiana (ASI)
- Consiglio Nazionale delle Ricerche (CNR)
- Istituto Nazionale di Astrofisica (INAF)
- NASA
- Department of Energy (DOE)
- United Kingdom Space Agency (UKSA)
- Consejo Superior de Investigaciones Científicas (CSIC)
- Ministerio de Economía, Industria y Competitividad (MINECO)
- Junta de Andalucía
- Spanish Supercomputing Network (RES)
- Ministry of Employment and the Economy (Finland)
- Academy of Finland
- Finnish IT Center for Science (CSC)
- Deutsches Zentrum für Luft- und Raumfahrt (DLR)
- Max Planck Society
- Canadian Space Agency (CSA)
- DTU Space (Denmark)
- State Secretariat for Education and Research (Switzerland)
- Swiss Space Office (SSO)
- Research Council of Norway
- Science Foundation, Ireland
- Fundação para a Ciência e a Tecnologia (FCT)
- Ministério da Ciência, Tecnologia e Ensino Superior (MCTES)
- Partnership for Advanced Computing in Europe (PRACE)
- Created
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2019-10-01Created from EPrint's datestamp field
- Updated
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2023-05-08Created from EPrint's last_modified field
- Caltech groups
- Astronomy Department