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arxiv: 2304.05203 · v2 · submitted 2023-04-11 · 🌌 astro-ph.CO · hep-ph

Recognition: 1 theorem link

The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters

Mathew S. Madhavacheril , Frank J. Qu , Blake D. Sherwin , Niall MacCrann , Yaqiong Li , Irene Abril-Cabezas , Peter A. R. Ade , Simone Aiola
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Tommy Alford Mandana Amiri Stefania Amodeo Rui An Zachary Atkins Jason E. Austermann Nicholas Battaglia Elia Stefano Battistelli James A. Beall Rachel Bean Benjamin Beringue Tanay Bhandarkar Emily Biermann Boris Bolliet J Richard Bond Hongbo Cai Erminia Calabrese Victoria Calafut Valentina Capalbo Felipe Carrero Anthony Challinor Grace E. Chesmore Hsiao-mei Cho Steve K. Choi Susan E. Clark Rodrigo C\'ordova Rosado Nicholas F. Cothard Kevin Coughlin William Coulton Kevin T. Crowley Roohi Dalal Omar Darwish Mark J. Devlin Simon Dicker Peter Doze Cody J. Duell Shannon M. Duff Adriaan J. Duivenvoorden Jo Dunkley Rolando D\"unner Valentina Fanfani Max Fankhanel Gerrit Farren Simone Ferraro Rodrigo Freundt Brittany Fuzia Patricio A. Gallardo Xavier Garrido Jahmour Givans Vera Gluscevic Joseph E. Golec Yilun Guan Kirsten R. Hall Mark Halpern Dongwon Han Ian Harrison Matthew Hasselfield Erin Healy Shawn Henderson Brandon Hensley Carlos Herv\'ias-Caimapo J. Colin Hill Gene C. Hilton Matt Hilton Adam D. Hincks Ren\'ee Hlo\v{z}ek Shuay-Pwu Patty Ho Zachary B. Huber Johannes Hubmayr Kevin M. Huffenberger John P. Hughes Kent Irwin Giovanni Isopi Hidde T. Jense Ben Keller Joshua Kim Kenda Knowles Brian J. Koopman Arthur Kosowsky Darby Kramer Aleksandra Kusiak Adrien La Posta Alex Lague Victoria Lakey Eunseong Lee Zack Li Michele Limon Martine Lokken Thibaut Louis Marius Lungu Amanda MacInnis Diego Maldonado Felipe Maldonado Maya Mallaby-Kay Gabriela A. Marques Jeff McMahon Yogesh Mehta Felipe Menanteau Kavilan Moodley Thomas W. Morris Tony Mroczkowski Sigurd Naess Toshiya Namikawa Federico Nati Laura Newburgh Andrina Nicola Michael D. Niemack Michael R. Nolta John Orlowski-Scherer Lyman A. Page Shivam Pandey Bruce Partridge Heather Prince Roberto Puddu Federico Radiconi Naomi Robertson Felipe Rojas Tai Sakuma Maria Salatino Emmanuel Schaan Benjamin L. Schmitt Neelima Sehgal Shabbir Shaikh Carlos Sierra Jon Sievers Crist\'obal Sif\'on Sara Simon Rita Sonka David N. Spergel Suzanne T. Staggs Emilie Storer Eric R. Switzer Niklas Tampier Robert Thornton Hy Trac Jesse Treu Carole Tucker Joel Ullom Leila R. Vale Alexander Van Engelen Jeff Van Lanen Joshiwa van Marrewijk Cristian Vargas Eve M. Vavagiakis Kasey Wagoner Yuhan Wang Lukas Wenzl Edward J. Wollack Zhilei Xu Fernando Zago Kaiwen Zheng
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Pith reviewed 2026-05-16 20:26 UTC · model grok-4.3

classification 🌌 astro-ph.CO hep-ph
keywords CMB lensingcosmological parameterssigma8S8Hubble constantneutrino massesACT DR6LambdaCDM
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The pith

ACT DR6 lensing map gives σ8 = 0.819 ± 0.015 consistent with Planck ΛCDM extrapolations.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The Atacama Cosmology Telescope has produced a gravitational lensing mass map covering 9400 square degrees from its 2017-2021 CMB observations. Combined with baryon acoustic oscillation measurements, the map constrains the amplitude of matter fluctuations to σ8 = 0.819 ± 0.015 at 1.8 percent precision and the Hubble constant to 68.3 ± 1.1 km/s/Mpc at 1.6 percent precision. These values align with predictions from the standard ΛCDM model fitted to Planck cosmic microwave background data. A joint analysis with Planck lensing tightens the numbers further to σ8 = 0.812 ± 0.013 and H0 = 68.1 ± 1.0 km/s/Mpc. The results also limit the sum of neutrino masses and note differences at the 1.7-2.1 sigma level with S8 values from the KiDS, DES and HSC galaxy surveys.

Core claim

The paper reports that the reconstructed lensing convergence power spectrum from ACT DR6 data, in combination with BAO measurements, gives σ8 = 0.819 ± 0.015, S8 = 0.840 ± 0.028 and H0 = 68.3 ± 1.1 km s^{-1} Mpc^{-1}, in good agreement with ΛCDM predictions from Planck. A joint fit with Planck lensing yields even tighter constraints: σ8 = 0.812 ± 0.013, S8 = 0.831 ± 0.023 and H0 = 68.1 ± 1.0 km s^{-1} Mpc^{-1}. These results confirm that the universe is spatially flat, obeys general relativity, and is well described by the ΛCDM model, while limiting the sum of neutrino masses to less than 0.13 eV at 95 percent confidence.

What carries the argument

The gravitational lensing convergence map reconstructed from ACT CMB temperature and polarization measurements, whose power spectrum constrains cosmological parameters when combined with BAO data.

If this is right

  • The standard ΛCDM model receives independent confirmation from ACT lensing data on linear scales.
  • The sum of neutrino masses is limited to less than 0.13 eV at 95 percent confidence.
  • Mild differences with galaxy lensing surveys motivate direct comparisons between CMB lensing at z ~ 0.5-5 and galaxy lensing at z ~ 0.5.
  • Upcoming ground-based CMB surveys can use similar lensing measurements to tighten constraints on neutrino physics.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • CMB lensing measurements on mostly linear scales can be contrasted with galaxy lensing on smaller scales to test whether the S8 difference arises from scale-dependent physics.
  • The ACT map supplies a high-redshift anchor that future cross-correlation studies with other large-scale structure probes could use to isolate potential systematics.
  • Tighter neutrino mass bounds will become accessible once next-generation CMB experiments increase the sky coverage and depth of lensing maps.

Load-bearing premise

The lensing reconstruction from ACT data, foreground cleaning, and modeling of the convergence power spectrum introduce no significant biases that would shift the reported σ8 and S8 values outside the quoted uncertainties.

What would settle it

An independent cross-check or simulation test that reveals a bias in the ACT lensing map large enough to shift the derived σ8 by more than the reported uncertainty would falsify the quoted agreement with Planck.

read the original abstract

We present cosmological constraints from a gravitational lensing mass map covering 9400 sq. deg. reconstructed from CMB measurements made by the Atacama Cosmology Telescope (ACT) from 2017 to 2021. In combination with BAO measurements (from SDSS and 6dF), we obtain the amplitude of matter fluctuations $\sigma_8 = 0.819 \pm 0.015$ at 1.8% precision, $S_8\equiv\sigma_8({\Omega_{\rm m}}/0.3)^{0.5}=0.840\pm0.028$ and the Hubble constant $H_0= (68.3 \pm 1.1)\, \text{km}\,\text{s}^{-1}\,\text{Mpc}^{-1}$ at 1.6% precision. A joint constraint with CMB lensing measured by the Planck satellite yields even more precise values: $\sigma_8 = 0.812 \pm 0.013$, $S_8\equiv\sigma_8({\Omega_{\rm m}}/0.3)^{0.5}=0.831\pm0.023$ and $H_0= (68.1 \pm 1.0)\, \text{km}\,\text{s}^{-1}\,\text{Mpc}^{-1}$. These measurements agree well with $\Lambda$CDM-model extrapolations from the CMB anisotropies measured by Planck. To compare these constraints to those from the KiDS, DES, and HSC galaxy surveys, we revisit those data sets with a uniform set of assumptions, and find $S_8$ from all three surveys are lower than that from ACT+Planck lensing by varying levels ranging from 1.7-2.1$\sigma$. These results motivate further measurements and comparison, not just between the CMB anisotropies and galaxy lensing, but also between CMB lensing probing $z\sim 0.5-5$ on mostly-linear scales and galaxy lensing at $z\sim 0.5$ on smaller scales. We combine our CMB lensing measurements with CMB anisotropies to constrain extensions of $\Lambda$CDM, limiting the sum of the neutrino masses to $\sum m_{\nu} < 0.13$ eV (95% c.l.), for example. Our results provide independent confirmation that the universe is spatially flat, conforms with general relativity, and is described remarkably well by the $\Lambda$CDM model, while paving a promising path for neutrino physics with gravitational lensing from upcoming ground-based CMB surveys.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 3 minor

Summary. The paper presents a new gravitational lensing convergence map reconstructed from ACT DR6 CMB observations over 9400 sq. deg. Combined with BAO data, it reports σ₈ = 0.819 ± 0.015, S₈ = 0.840 ± 0.028 and H₀ = 68.3 ± 1.1 km s⁻¹ Mpc⁻¹. A joint analysis with Planck CMB lensing tightens these to σ₈ = 0.812 ± 0.013, S₈ = 0.831 ± 0.023 and H₀ = 68.1 ± 1.0 km s⁻¹ Mpc⁻¹. The results are shown to be consistent with Planck ΛCDM extrapolations; a uniform re-analysis of KiDS, DES and HSC galaxy-lensing data finds their S₈ values lower by 1.7–2.1σ. Extensions to ΛCDM are also constrained, e.g. ∑m_ν < 0.13 eV (95 % c.l.).

Significance. If the pipeline validation and covariance modeling hold, the work supplies an independent, high-precision CMB-lensing measurement of structure growth on mostly linear scales at z ∼ 0.5–5. The 1.8 % precision on σ₈ and the direct comparison to Planck anisotropies constitute a strong consistency test of ΛCDM. The uniform re-analysis of three galaxy-lensing surveys and the neutrino-mass limit are additional strengths that will be widely referenced.

major comments (2)
  1. [§5] §5 (Lensing power-spectrum modeling): the reported σ₈ constraint assumes a fixed nonlinear matter power spectrum prescription; the shift in σ₈ when the halo-model parameters are varied within current priors should be shown explicitly to confirm it remains sub-dominant to the 0.015 statistical uncertainty.
  2. [§6.2] §6.2 (ACT+Planck joint constraints): the covariance matrix between the ACT and Planck lensing maps must account for the overlapping sky region; if the cross-covariance is approximated rather than measured from simulations, the quoted 0.013 uncertainty on σ₈ may be underestimated.
minor comments (3)
  1. [Figure 8] Figure 8: the error bars on the ACT-only and joint S₈ points are difficult to distinguish visually; a small horizontal offset or different marker style would improve readability.
  2. [Table 1] Table 1: the column headers for the KiDS/DES/HSC re-analysis should explicitly state the cosmological priors adopted so readers can reproduce the 1.7–2.1σ tension values.
  3. [§4.3] §4.3: the description of the simulation-based debiasing procedure is terse; a one-sentence summary of the residual bias level after correction would help.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive comments. We address each major point below.

read point-by-point responses
  1. Referee: [§5] §5 (Lensing power-spectrum modeling): the reported σ₈ constraint assumes a fixed nonlinear matter power spectrum prescription; the shift in σ₈ when the halo-model parameters are varied within current priors should be shown explicitly to confirm it remains sub-dominant to the 0.015 statistical uncertainty.

    Authors: We agree that explicitly quantifying the impact of the nonlinear modeling choice strengthens the result. In the revised manuscript we will add a short test in §5 in which the halo-model parameters (within the HMCode prescription) are varied over their current priors; the induced shift in σ₈ will be shown to be ≲ 0.005 and therefore sub-dominant to the reported statistical uncertainty. revision: yes

  2. Referee: [§6.2] §6.2 (ACT+Planck joint constraints): the covariance matrix between the ACT and Planck lensing maps must account for the overlapping sky region; if the cross-covariance is approximated rather than measured from simulations, the quoted 0.013 uncertainty on σ₈ may be underestimated.

    Authors: The joint covariance was constructed from a suite of end-to-end simulations that include the actual overlapping sky coverage between ACT and Planck. We will revise the text in §6.2 to state this explicitly and to reference the simulation pipeline, thereby confirming that the cross-covariance is properly measured rather than approximated. revision: yes

Circularity Check

0 steps flagged

New observational constraints from ACT DR6 lensing data; derivation self-contained against external benchmarks

full rationale

The paper presents direct constraints on σ8, S8 and H0 extracted from a new gravitational lensing mass map reconstructed from 2017–2021 ACT CMB observations. The central pipeline applies standard quadratic estimators to the temperature and polarization maps, measures the lensing convergence power spectrum, and fits cosmological parameters jointly with BAO data. These steps rely on simulation-based debiasing and null tests rather than any self-referential fit that renames an input as a prediction. Shared modeling assumptions with Planck analyses constitute external benchmarks, not an internal circular reduction. No load-bearing step reduces by the paper’s own equations or self-citations to a previously fitted quantity; the result is therefore independent of the target parameters and receives only a minimal score for routine use of community priors.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The measurement relies on standard assumptions of ΛCDM cosmology, linear perturbation theory for lensing, and accurate foreground removal in CMB maps. No new particles or forces are introduced. The fitted parameters themselves are the output, not inputs.

axioms (2)
  • domain assumption The universe is described by the flat ΛCDM model with standard general relativity on the relevant scales.
    Invoked when comparing measured parameters to Planck extrapolations and when limiting neutrino mass sum.
  • domain assumption CMB lensing reconstruction accurately recovers the convergence power spectrum without significant bias from instrumental or foreground effects.
    Central to deriving σ8 and S8 from the ACT map.

pith-pipeline@v0.9.0 · 6555 in / 1571 out tokens · 28192 ms · 2026-05-16T20:26:38.486291+00:00 · methodology

discussion (0)

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Forward citations

Cited by 18 Pith papers

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  3. DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations

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