Cosmological parameters derived from the final Planck data release (PR4)

¹ Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
e-mail: tristram@ijclab.in2p3.fr
² IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
³ Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale, 91405 Orsay, France
⁴ Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, USA
⁵ Nicolaus Copernicus Academy and Superior School, Ul. Nowogrodzka 47A, 00-695 Warszawa, Poland
⁶ Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia V6T 1Z1, Canada
⁷ Centre National d’Études Spatiales – Centre Spatial de Toulouse, 18 Avenue Édouard Belin, 31401 Toulouse Cedex 9, France
⁸ Computational Cosmology Center, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
⁹ Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
¹⁰ Aix-Marseille Université, CNRS, CNES, LAM, Marseille, France
¹¹ Department of Astronomy, Haverford College, Haverford, PA 19041, USA

Received: 15 September 2023
Accepted: 29 October 2023

Abstract

We present cosmological parameter constraints using maps from the last Planck data release (PR4). In particular, we detail an upgraded version of the cosmic microwave background likelihood, HiLLiPoP, that is based on angular power spectra and relies on a physical modeling of the foreground residuals in the spectral domain. This new version of the likelihood retains a larger sky fraction (up to 75%) and uses an extended multipole range. Using this likelihood, along with low-ℓ measurements from LoLLiPoP, we derived constraints on ΛCDM parameters that are in good agreement with previous Planck 2018 results, but with smaller uncertainties by 10% to 20%. We demonstrate that the foregrounds can be accurately described in the spectral domain, with a negligible impact on ΛCDM parameters. We also derived constraints on single-parameter extensions to ΛCDM, including A_L, Ω_K, N_eff, and ∑m_ν. Noteworthy results from this updated analysis include a lensing amplitude value of A_L = 1.039 ± 0.052, which is more closely aligned with theoretical expectations within the ΛCDM framework. Additionally, our curvature measurement, Ω_K = −0.012 ± 0.010, is now fully consistent with a flat universe and our measurement of S₈ is closer to the measurements derived from large-scale structure surveys (at the 1.5σ level). We also added constraints from PR4 lensing, making this combination the most tightly constrained data set currently available from Planck. Additionally, we explored the addition of baryon acoustic oscillation data, which tightens the limits on some particular extensions to the standard cosmology.