Unified and Consistent Structure Growth Measurements from Joint ACT, SPT, and <i>Planck</i> CMB Lensing

We present the tightest cosmic microwave background (CMB) lensing constraints to date on the growth of structure by combining CMB lensing measurements from the Atacama Cosmology Telescope (ACT), the South Pole Telescope (SPT), and Planck. Each of these surveys individually provides lensing measurements with similarly high statistical power, achieving signal-to-noise ratios of approximately 40. The combined lensing band powers represent the most precise CMB lensing power spectrum measurement to date with a signal-to-noise ratio of 61 and an amplitude of A_{lens}^{recon}=1.025±0.017 with respect to the theory prediction from the best-fit CMB Planck-ACT cosmology. The band powers from all three lensing datasets, analyzed jointly, yield a 1.6% measurement of the parameter combination S_{8}^{CMBL}≡σ_{8}(Ω_{m}/0.3)^{0.25}=0.825_{-0.013}^{+0.015}. Including dark energy spectroscopic instrument baryon acoustic oscillation (BAO) data improves the constraint on the amplitude of matter fluctuations to σ_{8}=0.829±0.009 (a 1.1% determination). When combining with uncalibrated supernovae from Pantheon+, we present a 4% sound-horizon-independent estimate of H_{0}=66.4±2.5 km s^{-1} Mpc^{-1}. The joint lensing constraints on structure growth and present-day Hubble rate are fully consistent with a ΛCDM model fit to the primary CMB data from Planck and ACT. While the precise upper limit is sensitive to the choice of data and underlying model assumptions, when varying the neutrino mass sum within the ΛCDM cosmological model, the combination of primary CMB, BAO, and CMB lensing drives the probable upper limit for the mass sum towards lower values, comparable to the minimum mass prior required by neutrino oscillation experiments.

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Publication Details

Journal
Physical Review Letters
Published
2025-11-21
DOI
https://doi.org/10.1103/k5yr-3h6d
Citations
2
Primary Topic
Cosmology and Gravitation Theories
Type
article
Field-Weighted Citation Impact
2.31
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article

Unified and Consistent Structure Growth Measurements from Joint ACT, SPT, and Planck CMB Lensing

Karl J. Friston
2 citations
Physical Review Letters
Cosmology and Gravitation Theories
2.31
article

Unified and Consistent Structure Growth Measurements from Joint ACT, SPT, and Planck CMB Lensing

Karl J. Friston
article en
2 citations

Abstract

We present the tightest cosmic microwave background (CMB) lensing constraints to date on the growth of structure by combining CMB lensing measurements from the Atacama Cosmology Telescope (ACT), the South Pole Telescope (SPT), and Planck. Each of these surveys individually provides lensing measurements with similarly high statistical power, achieving signal-to-noise ratios of approximately 40. The combined lensing band powers represent the most precise CMB lensing power spectrum measurement to date with a signal-to-noise ratio of 61 and an amplitude of A_{lens}^{recon}=1.025±0.017 with respect to the theory prediction from the best-fit CMB Planck-ACT cosmology. The band powers from all three lensing datasets, analyzed jointly, yield a 1.6% measurement of the parameter combination S_{8}^{CMBL}≡σ_{8}(Ω_{m}/0.3)^{0.25}=0.825_{-0.013}^{+0.015}. Including dark energy spectroscopic instrument baryon acoustic oscillation (BAO) data improves the constraint on the amplitude of matter fluctuations to σ_{8}=0.829±0.009 (a 1.1% determination). When combining with uncalibrated supernovae from Pantheon+, we present a 4% sound-horizon-independent estimate of H_{0}=66.4±2.5 km s^{-1} Mpc^{-1}. The joint lensing constraints on structure growth and present-day Hubble rate are fully consistent with a ΛCDM model fit to the primary CMB data from Planck and ACT. While the precise upper limit is sensitive to the choice of data and underlying model assumptions, when varying the neutrino mass sum within the ΛCDM cosmological model, the combination of primary CMB, BAO, and CMB lensing drives the probable upper limit for the mass sum towards lower values, comparable to the minimum mass prior required by neutrino oscillation experiments.

Physical Review LettersVol. 136(2)
University of California, Riverside (US), Canadian Institute for Advanced Research (CA), University of Geneva (CH), California Institute of Technology (US), Argonne National Laboratory (US), Pontificia Universidad Católica de Valparaíso (CL), Goddard Space Flight Center (US), Fermi National Accelerator Laboratory (US), National Institute of Standards and Technology (US), High Energy Accelerator Research Organization (JP), University of British Columbia (CA), Lawrence Berkeley National Laboratory (US), University of Illinois Urbana-Champaign (US), University of California, Los Angeles (US), The University of Melbourne (AU), University of Pittsburgh (US), University of Toronto (CA), University of the Witwatersrand (ZA), Princeton University (US), Université Paris Cité (FR), Cornell University (US), University of Cambridge (GB), Université Paris-Saclay (FR), Geophysical Survey (RU), SLAC National Accelerator Laboratory (US), University of Colorado System (US), California University of Pennsylvania (US), Sorbonne Université (FR), University of Oxford (GB), University of Chicago (US), Institute of Astrophysics and Space Sciences (PT), Max Planck Institute for Astrophysics (DE), Institute of Astronomy (RU), Center for Astrophysics Harvard & Smithsonian (US), National Institute of Standards (EG), Flatiron Health (United States) (US), SHIELDS for Families (US), Flatiron Institute (US), Laboratoire Médiations (FR), McGill University (CA), Arizona State University (US), Case Western Reserve University (US), Stony Brook University (US), The University of Tokyo (JP), Columbia University (US), Cardiff University (GB), Michigan State University (US), University of KwaZulu-Natal (ZA), University of California, Berkeley (US), Stanford University (US)
Openalex Percentile: Top 9%
Cosmology and Gravitation Theories
2.31
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