REVIEW 2 major objections 6 minor 1 cited by
The Atacama Cosmology Telescope: High-redshift measurement of structure growth from the cross-correlation of Quaia quasars and CMB lensing from ACT DR6 and $\textit{Planck}$ PR4
T0 review · 2 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read Cross-correlating quasars with CMB lensing reconstructs structure growth to redshift z≈5 and finds it consistent with Planck's ΛCDM prediction.
desk verdict A careful 3x2pt measurement with a robust σ8 result and a genuinely new but conditional z~5.1 growth constraint. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The enabling machinery is the 3×2pt data vector: quasar auto-spectra $C^{gg}_\ell$, quasar–lensing cross-spectra $C^{\kappa g}_\ell$, and the CMB lensing auto-spectrum $C^{\kappa\kappa}_\ell$, together with the step-function modification $P^{\rm new}_{\rm lin}(k,z)=P_{\rm lin}(k,z)A(z)$, where $A(z)$ equals $A_1$, $A_2$, or $A_3$ on $z<1.45$, $1.45\le z<3$, and $z\ge3$. The cross-correlations pin down $A_1$ and $A_2$ through the quasar kernels at $z\simeq1.0$ and $2.1$, so the lensing auto-spectrum, whose kernel peaks near $z\sim2$ but extends further, can separate the residual contribution and constrain $A_3$. This is how the paper converts a $z\sim2$ lensing signal into a $z\approx5.1$ growth measurement.
What would settle it
Measure $\sigma_8(\tilde z=5.1)$ using a spectroscopically calibrated $dN/dz$ for the same quasars on the ACT footprint; if the central value shifts by more than roughly $0.03$, the high-redshift growth claim would not be robust to redshift-distribution assumptions. Alternatively, replacing Quaia with an independent high-redshift tracer and recovering the same $\sigma_8(\tilde z=5.1)$ would confirm the result, whereas a $>2\sigma$ difference would refute it.
Extended reading notes
Core claim
On the paper's own terms, the central result is a reconstruction of the growth of matter fluctuations over $0\lesssim z\lesssim 6$. The data combination fixes the late-time normalization at $\sigma_8=0.804\pm0.013$ (with BAO), and, by rescaling the linear matter power spectrum with piecewise-constant step amplitudes $A_1,A_2,A_3$ below $z=1.45$, between $1.45$ and $3$, and above $3$, it isolates the highest bin and measures $\sigma_8(\tilde z=5.1)=0.146^{+0.021}_{-0.014}$. This is consistent with Planck at $1.4\sigma$. A suite of null tests using polarization-only, temperature-only, CIB-deprojected, and curl lensing maps, plus foreground-only simulations, shows no contamination in the ACT lensing maps, which the paper takes as evidence that the earlier low-$\sigma_8$ hint in Quaia–Planck cross-correlations came from analysis choices rather than lensing systematics.
Load-bearing premise
The load-bearing assumption is that the true growth history is captured by three constant rescaling factors of the matter power spectrum, and that the quasar redshift distributions and linear bias are accurate enough that the highest-redshift factor isolates only $z>3$ growth, despite a 62% correlation with the middle bin.
Editorial extensions
If this is right
- The 12% constraint on $\sigma_8(\tilde z=5.1)$ gives a growth anchor at one of the highest redshifts measured to date, useful for testing models that modify gravity or dark energy at late times.
- Adding the lensing auto-spectrum to the cross-correlation tightens $\sigma_8$ by 12% relative to the lensing auto-spectrum alone, so the same variance-cancellation gain is available to future 3×2pt analyses without new data.
- The null-test results validate ACT DR6 lensing maps as a clean probe for high-redshift quasar cross-correlations, retiring the contamination concern raised by earlier Planck PR4 analyses.
- The recovered growth curve is consistent with Planck ΛCDM at every measured redshift bin, so the joint dataset does not require new physics in structure growth.
- The 1.8$\sigma$ low amplitude in the $z\approx2.1$ quasar bin, if not a fluctuation, would be a property of the quasar sample itself rather than of the lensing maps.
Reading between the lines
- A consequence the paper leaves implicit: because $A_2$ and $A_3$ are 62% correlated, the headline $z\approx5.1$ amplitude inherits the assumed $dN/dz$; a shift at the 5% level the paper itself finds on the ACT footprint could move $\sigma_8(\tilde z=5.1)$ by more than the quoted error.
- A natural extension is to repeat the analysis with a spectroscopic redshift calibration of Quaia on the ACT footprint; the paper's own footprint comparison shows this is the most promising place to look for systematic movement.
- If the 1.8$\sigma$ low amplitude in the high-redshift bin persists in independent quasar samples, it becomes a tracer-dependent tension worth modeling through bias evolution or selection functions, separating it from lensing systematics.
- The step-function amplitude parametrization could be applied to other high-redshift tracers, such as Lyman-break galaxies or line-intensity maps, to check whether $A_3$ measures the same underlying growth or is tracer-dependent.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents a joint ('3×2pt') analysis combining two Quaia quasar samples (z̄ ≈ 1.0 and z̄ ≈ 2.1) with CMB lensing from ACT DR6 and Planck PR4, plus BAO data. From the 2×2pt combination (quasar auto-spectra and quasar–lensing cross-spectra) with BOSS/6dF BAO the authors obtain σ8 = 0.802+0.045−0.057; adding the ACT DR6 Cκκ spectrum tightens this to σ8 = 0.804 ± 0.013, consistent with Planck primary CMB. Using a piecewise rescaling of the matter power spectrum (Eqs. 11–12) with knots at z = 1.45 and z = 3.0 and As fixed to Planck, they reconstruct the growth history and report a 12% constraint at the median redshift z̃ = 5.1, σ8(z̃=5.1) = 0.146+0.021−0.014, consistent with Planck at 1.4σ. The paper also reanalyzes the Planck PR4 × Quaia cross-correlation with conservative analysis choices (kmax = 0.15 h/Mpc, shot noise marginalized) and finds no evidence for the lensing-map contamination suggested in earlier Quaia analyses.
Significance. If correct, the main σ8 = 0.804 ± 0.013 result is a high-redshift-tracer constraint fully consistent with Planck primary, and the z ≈ 5.1 growth amplitude would be among the highest-redshift growth measurements to date. The paper's strengths are substantial: 400 ACT and 480 Planck Monte Carlo simulations, sub-1% transfer-function corrections, Hartlap-corrected covariance, a documented (if partial) blinding protocol, 18 null tests with a KS test on the PTE distribution, simulation-based foreground tests using WebSky/HOD mocks, and public data products. The headline σ8 is dominated by Cκκ and is robust to the modeling choices discussed below. The genuinely new σ8(z̃ = 5.1) claim is, however, conditional on the step-function growth parametrization, the Planck-fixed As normalization, and the quasar dN/dz and linear-bias modeling, and it is not protected by the lensing-map null tests. The claim should be revised or supplemented with the stress tests requested below.
major comments (2)
- [Section 7.3; Eqs. (11)–(12)] σ8(z̃ = 5.1) = 0.146+0.021−0.014 is not a direct z > 3 measurement: it is the parameter A3 in the piecewise rescaling of the Planck-normalized power spectrum, with As fixed to its Planck PR3 value (Section 3.2; Table 3). The stress-test concern is valid. The paper reports up to 5% differences between the PDF-stacked dN/dz on the ACT footprint and the full-footprint estimate (Section 2.1), a residual A2–A3 correlation of 62% (Section 7.3), and a linear bias model (Eq. 9) whose normalization is free but whose redshift shape is assumed. None of the Section 5 null tests — which validate the lensing maps rather than the quasar redshift model — protects the A3 extraction against a mis-modeled low-redshift contribution. I request at least one of the following: (a) a test of ΔA3/A3 and of σ8(z̃ = 5.1) under a ±5% dN/dz shift in each bin; (b) a repeat using the Lima et al. (2008) direct-calibration dN/dz; (c) a version of A(z) with an additional knot (e.g., z2 = 3.5) to show that A3 is not absorbing a lower-redshift deviation. If these tests cannot be performed, the abstract and conclusion should be reworded so that the z > 3 statement is explicitly conditioned on the assumed growth shape and redshift model.
- [Section 6.1 (Changes post unblinding); Appendix A] The blinding policy was not fully realized for the baseline scale cut. Section 6.1 states that kmax was changed from 0.22 to 0.15 h/Mpc after comparing ACT and Planck bandpowers, and Appendix A reports that the inferred σ8 shifts significantly with scale cuts when the shot-noise amplitudes are free to vary. The baseline choice is therefore informed by the data being analyzed, and the quoted Planck-reanalysis value σ8 = 0.797+0.048−0.063 is selected from a family of scale-cut-dependent results. This does not invalidate the 3×2pt headline, which is dominated by Cκκ, but it is load-bearing for the Appendix A claim and for the robustness of the 2×2pt contribution to the 3×2pt constraint. I request a scan of σ8 and S8 versus kmax (e.g., 0.12, 0.15, 0.18, 0.22 h/Mpc) with the associated PTEs, so the reader can assess whether 0.15 h/Mpc is a stable plateau rather than a post-selected value.
minor comments (6)
- [Table 4] In the ACT DR6 × Quaia + BAO, Joint row, the σ8 upper error is printed as −0.92; this should read −0.092.
- [References] Alam et al. 2017a and 2017b are both listed with the same journal volume and pages (MNRAS 470, 2617); the eBOSS citation in Section 6.3 cannot be correct with that journal data.
- [References] The DOI listed for Sailer et al. 2025 (10.1103/27rg-tq8z) is malformed and should be corrected.
- [Abstract; Section 5] The abstract's statement that there is 'no evidence for contamination in the lensing maps' extrapolates beyond the ACT-specific tests in Section 5; the evidence for Planck PR4 maps is indirect (parameter-level agreement plus the Appendix A reanalysis), and the wording should be qualified accordingly.
- [Figure 10] The grey consistency-test points are described only collectively in the caption; a labeled list or table of which analysis choices were varied would let the reader verify the scope of the robustness tests.
- [Figure 12] The σ8(z) reconstruction is drawn as a continuous curve with shaded bands, but the underlying model is a step function with known correlations between adjacent bins (24–62%, Section 7.3); the figure should make the piecewise nature and the neglected inter-bin correlations explicit.
Circularity Check
No significant circularity: the headline σ8 constraint is dominated by independent CMB lensing spectra, and the high-redshift growth amplitude is a free parameter fitted to the data rather than an input.
full rationale
The paper's derivation chain is self-contained against external benchmarks. The headline σ8 = 0.804 ± 0.013 comes from the 3×2pt combination dominated by the ACT DR6 lensing auto-spectrum Cκκ (Qu et al. 2024) plus BAO, with the 2×2pt Quaia measurements contributing via variance cancellation; no fitted parameter is renamed as a prediction here. The growth reconstruction in Section 7.3 is implemented through the free amplitude parameters A1, A2, A3 in Eqs. (11)–(12), with uniform priors [0, 2] (Table 3). Fixing As to the Planck PR3 value (Section 3.2 and the Table 3 note) only sets the fiducial normalization of σ8(z); A3 is then determined by the data through Cκκ and the cross-correlations, so the reported σ8(ẑ = 5.1) = 0.146^{+0.021}_{-0.014} and its 1.4σ consistency with Planck are not enforced by construction — the data could have preferred A3 far from unity. Self-citations (Alonso et al. 2023 for dN/dz robustness, Farren et al. 2025 for the non-linear rescaling and 3×2pt methodology) supply supporting empirical checks or modeling conventions rather than uniqueness theorems, and the central cosmological claims do not reduce to those citations. The contamination null tests and WebSky/HOD foreground tests validate the lensing maps used in the analysis; they are not inputs to the cosmological parameter fit. The main legitimate concern is a systematic-robustness risk, not circularity: the up-to-5% ACT-footprint dN/dz differences (Section 2.1) and the 62% A2–A3 correlation (Section 7.3) imply that the z > 3 amplitude extraction depends on the quasar redshift and bias modeling. This should be stress-tested further, but it does not make any equation equal its own input, so it does not raise the circularity score.
Assumptions & free parameters
free parameters (6)
- b_g^1, b_g^2 (linear bias normalizations) =
b1 = 1.16^{+0.22}_{-0.25}, b2 = 1.02^{+0.20}_{-0.23} (Table 1)
- A_N1, A_N2 (shot noise amplitudes) =
A_N1 = 1.001 ± 0.014, A_N2 = 1.0115 ± 0.0067 (Planck footprint, Appendix A)
- A1, A2, A3 (growth amplitude parameters) =
σ8√A1 = 0.638^{+0.041}_{-0.040}, σ8√A2 = 0.327^{+0.040}_{-0.049}, σ8√A3 = 0.146^{+0.021}_{-0.014} (Section 7.3)
- z1 = 1.45, z2 = 3.0 (growth parametrization boundaries)
- kmax = 0.15 h/Mpc (scale cut)
- Mmin,1, Mmin,2 (HOD minimum halo masses) =
1.4e12 and 1.3e12 h^-1 Msun (Appendix B)
assumptions (10)
- standard math Limber approximation for projected power spectra
- domain assumption Linear galaxy bias: Pgm = b(z)Pmm and Pgg = b²(z)Pmm up to kmax = 0.15 h/Mpc
- domain assumption eBOSS bias redshift evolution shape (Laurent et al. 2017) applies to Quaia (Equation 9)
- domain assumption Quaia dN/dz from PDF stacking with Gaussian redshift errors is accurate to ~5%
- domain assumption Poisson shot noise with a 10% Gaussian prior
- domain assumption As fixed to the Planck PR3 value for the growth reconstruction
- standard math τ, ns, and Ωb h² fixed to Planck-derived values in the 2×2pt case
- domain assumption Magnification bias is negligible
- domain assumption HMCode non-linear corrections apply
- domain assumption WebSky HOD mocks reproduce Quaia clustering
Cite this review
Pith. "Pith review of The Atacama Cosmology Telescope: High-redshift measurement of structure growth from the cross-correlation of Quaia quasars and CMB lensing from ACT DR6 and $\textit{Planck}$ PR4." pith.science (2026). https://pith.science/paper/2C6GMNMD
@misc{pith2026250708798,
author = {Pith},
title = {Pith review of: The Atacama Cosmology Telescope: High-redshift measurement of structure growth from the cross-correlation of Quaia quasars and CMB lensing from ACT DR6 and $\textitPlanck$ PR4},
year = {2026},
howpublished = {\url{https://pith.science/paper/2C6GMNMD}},
note = {Machine review of arXiv:2507.08798}
}
abstract
We measure the amplitude of matter fluctuations over a wide range of redshifts by combining CMB lensing observations from ACT DR6 and $\textit{Planck}$ PR4 with the overdensity of quasars from Quaia, a $\textit{Gaia}$ and $\textit{unWISE}$ quasar catalog. Our analysis includes the CMB lensing power spectrum from ACT DR6, the auto-correlation of two Quaia quasar samples centered at $z \simeq 1.0$ and $z \simeq 2.1$, and their cross-correlations with CMB lensing from both ACT DR6 and $\textit{Planck}$ PR4. By performing a series of contamination and systematic null tests, we find no evidence for contamination in the lensing maps, contrary to what was suggested in previous Quaia cross-correlation analyses using $\textit{Planck}$ PR4 CMB lensing data. From the joint analysis of the quasar auto- and cross-correlations with CMB lensing, and including BOSS BAO data to break the degeneracy between $\Omega_m$ and $\sigma_8$, we obtain $\sigma_8 = 0.802^{+0.045}_{-0.057}$, consistent with $\Lambda$CDM predictions from $\textit{Planck}$ primary CMB measurements. Combining the CMB lensing auto-spectrum with the cross-correlation measurement improves the constraint on $\sigma_8$ by $12\%$ relative to the lensing auto-spectrum alone, yielding $\sigma_8 = 0.804 \pm 0.013$. This dataset combination also enables a reconstruction of structure growth across redshifts. We infer a $12\%$ constraint on the amplitude of matter fluctuations at $z > 3$, with a measurement at the median redshift of the signal of $\sigma_8(\tilde{z}=5.1) = 0.146^{+0.021}_{-0.014}$, consistent with $\textit{Planck}$ at the $1.4\sigma$ level. These results provide one of the highest redshift constraints on the growth of structure to date.
Figures
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Forward citations
Cited by 1 Pith paper
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Low-redshift constraints on structure growth from CMB lensing tomography
Low-redshift galaxy clustering and CMB lensing tomography with hybrid effective field theory gives S8=0.79±0.06, consistent with Planck, while data alone prefer Ωm=0.245±0.024.
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Reviewed August 6, 2026 · model on record in the stance chip above.
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