REVIEW 4 major objections 6 minor 124 references
A new measurement of the FRB DM-galaxy cross correlation and a first joint analysis with the kinematic SZ effect
T0 review · 4 major / 6 minor · reviewed 2026-08-15 · deepseek-v4-flash
Pith's one-line read With 130 localized fast radio bursts and 27 million galaxies, the FRB DM-galaxy cross-correlation is detected at 6.5 sigma and disfavors gas tracing dark matter at about 9 sigma.
desk verdict A real detection and a promising first FRB-kSZ joint step, with a jackknife covariance that wobbles by ~1σ under patch choice—worth refereeing, but treat the headline significances as provisional. 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 central object is the DM contrast deltaDM, the per-FRB dispersion-measure excess defined by subtracting Milky Way, mean cosmic, and mean host contributions, which integrates the electron overdensity delta_e along the line of sight. Cross-correlating this line-of-sight electron column with foreground galaxy positions gives the projected galaxy-electron correlation function xi_{g,deltaDM}(r); the halo model then splits this into one-halo and two-halo terms, with the electron profile described by the baryonification (BCEmu) parameters log10 M_c, theta_ej, and eta. FLAMINGO simulations supply fiducial and strong-feedback predictions, and an NFW dark-matter-tracing model provides the no-feedback null. Converting DM to optical depth via delta_tau = sigma_T (1+z) deltaDM allows direct comparison with kSZ measurements, and the CAP-filter estimator makes the comparison aperture-matched.
What would settle it
Split the same 130 FRBs into two independent halves and recompute xi_{g,deltaDM} and its covariance; if the two halves disagree more than the jackknife error, or if the combined significance drops below about 3 sigma, the quoted 6.5 and 9 sigma results overstate the evidence. A cleaner test is to repeat the measurement with a much larger localized sample and an analytic covariance that includes shot noise and redshift-slice correlations.
Extended reading notes
Core claim
The paper's central claim is that the FRB DM-galaxy cross-correlation, measured with 130 localized FRBs with host redshifts and 27.3 million DESI BGS galaxies, is detected at 6.5 sigma in both configuration and harmonic space, the strongest such detection to date. The measured radial signal is incompatible with a no-feedback scenario in which gas traces the underlying dark matter at roughly 9 sigma. In halo-model and FLAMINGO comparisons, the lower-mass bins prefer strong feedback, and the electron clustering on scales beyond a few Mpc is presented as among the first direct measurements of large-scale electron clustering. The paper further claims that the FRB signal agrees with a recent kSZ measurement of the same galaxies and that, combined with kSZ, it yields a first estimate of the growth rate f sigma8 (or the velocity reconstruction parameter r) and of the kSZ velocity bias factor b_v.
Load-bearing premise
The headline significances rest on a leave-one-patch-out error estimate built from only 130 FRBs shared across all separation bins, so if that estimate understates the true variance, the 6.5 sigma detection and 9 sigma no-feedback rejection would both shrink.
Editorial extensions
If this is right
- Electron clustering around BGS galaxies is now measured on scales from roughly 0.3 to 30 comoving Mpc, establishing FRB two-point statistics as a direct tracer of large-scale electron clustering.
- The no-feedback null, in which gas traces dark matter, is disfavored at about 9 sigma, indicating that baryons are redistributed relative to dark matter around these galaxies.
- FRB and kSZ signals agree within uncertainties and are complementary: FRBs constrain scales above a few Mpc while kSZ is strongest near 1 Mpc.
- A first joint FRB-kSZ analysis demonstrates how the kSZ optical-depth degeneracy can be broken, yielding constraints on f sigma8 and the kSZ velocity bias factor b_v.
- With future samples, the same statistic is expected to provide precision constraints on cosmic baryons and to complement weak-lensing, X-ray, and CMB probes of feedback.
Reading between the lines
- If the electron clustering measured here is confirmed with larger samples, the same cross-correlation could serve as a direct calibration of baryonic feedback in weak-lensing analyses, potentially reducing a leading systematic in cosmological parameter constraints.
- The FRB-kSZ combination, applied to future CMB surveys and thousands of localized FRBs, could yield an independent measurement of f sigma8 that does not rely on galaxy-velocity assumptions.
- A testable extension is to split the FRB sample by DM selection cuts or host-galaxy properties; if the signal depends strongly on the high-DM tail, selection effects larger than assumed would show up in the cross-correlation amplitude.
- Because FRBs can access sub-arcminute scales, the technique could eventually map gas profiles in individual halos and the CGM-IGM transition, a regime kSZ cannot reach.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper measures the cross-correlation between FRB dispersion-measure fluctuations (δDM) and the DESI Legacy Survey Bright Galaxy Sample using 130 localized FRBs, including 11 new DSA-110 sources. It presents the measurement in configuration space and in harmonic space, reports a 6.5σ detection, compares the signal to FLAMINGO simulations and to a baryonification-style halo model, and interprets the results as disfavoring a no-feedback NFW scenario at roughly 9σ. It also converts the DM signal to optical depth, compares it to recent kSZ measurements of BGS galaxies, and makes a first attempt at joint FRB-kSZ constraints on the kSZ optical-depth degeneracy, expressed as constraints on r or fσ8 and on the velocity bias factor b_v.
Significance. If the reported significance survives scrutiny, this is a landmark measurement: it would be the strongest detection of the DM-galaxy cross-correlation with localized FRBs, the first mass-binned measurement of this statistic, and a genuinely new handle on the clustering of cosmic electrons on scales from sub-Mpc to tens of Mpc. The joint FRB-kSZ analysis is a novel and promising proof of concept for breaking the optical-depth degeneracy. The paper is also notable for adding new DSA-110 FRB redshifts and for making the FLAMINGO comparison in a way that keeps the two-halo amplitude close to unity. The main caveat is that the headline significance and the NFW-disagreement both rest on a jackknife covariance whose own convergence test shows roughly ±1σ shifts, and the harmonic-space cross-check explicitly neglects cross-redshift-slice covariance. These are fixable in revision, and the underlying data are valuable.
major comments (4)
- [Section 4.1, Eq. (5) and the Npatch discussion] The jackknife covariance is the load-bearing element for the headline 6.5σ and ~9σ claims, and the paper itself reports that the fiducial SNR for the log10 M*>10 bin changes by approximately ±1σ when Npatch is changed by a factor of two. With 130 FRBs shared across all radial bins and 150 patches, the covariance estimator is not in the asymptotic regime, and the Hartlap correction in Eq. (5) only corrects inversion bias of a Wishart-distributed covariance; it cannot fix an estimator whose variance is still changing with patch count. Please provide a convergence test, a bootstrap over FRBs (or FRB jackknife), and/or an analytic covariance estimate with a shot-noise model, and propagate the resulting covariance uncertainty into the quoted SNR and the NFW-disagreement significance.
- [Section 4.2, Eq. (11) and the following paragraph] The harmonic-space SNR is computed with an analytic covariance that neglects covariance between the five redshift slices, justified by the assumptions that FRB noise dominates and that galaxy slices are uncorrelated. Since the same FRBs are reused in every slice and photometric redshift errors can scatter galaxies between slices, the neglected off-diagonal term should be quantified rather than assumed small. Please estimate this term (e.g., with mocks or a hybrid jackknife) or state clearly that the harmonic-space detection significance is an approximation; otherwise the harmonic-space result cannot serve as an independent validation of the configuration-space claim.
- [Section 3.1 and Section 6.4] Two ad hoc cuts are applied after inspecting the data: the exclusion of FRB 20240304B because of its high redshift, and the δDM>300 pc/cm3 cut applied to seven FRBs in the southern portion of DESI. The paper asserts that these cuts are not expected to bias the measurement significantly, but for the redshift cut no quantitative test is shown, and for the southern cut only an amplitude/noise statement is given. Because the second cut is applied directly on δDM, it can in principle correlate with foreground structure and affect the cross-correlation. Please add a robustness table showing the fiducial SNR, best-fit parameters, and NFW-disagreement significance with and without each cut, and consider presenting a blinded version of the analysis.
- [Section 5.2 and Figure 7] The ~9σ disfavoring of the no-feedback NFW scenario and the matter power spectrum suppression curve in Figure 7 are both outputs of the same three-parameter BCEmu halo model fitted to the same data vector used for the detection. Figure 7's hatched curve is therefore a fit-derived extrapolation through the baryonification framework, not an independent measurement, and the text should label it as such. Please add a posterior predictive check or a scale-resolved goodness-of-fit diagnostic to show that the halo model actually describes the data, and state explicitly that the quoted NFW-disagreement significance inherits the covariance uncertainty discussed in the first major comment.
minor comments (6)
- [Abstract and Table 1] The abstract claims a 6.5σ detection 'in both configuration and harmonic space,' but Table 1 lists SNRCℓ = 6.2 for the harmonic-space measurement; please harmonize the wording or the numbers.
- [Section 1] The text contains the typo 'armcimute-scale'; it should read 'arcminute-scale'.
- [Section 4.3, Eq. (12)] Equation (12) includes an explicit (1+z_g) weight in the FRB-optical-depth estimator, while the conversion in Eq. (C18) already contains a (1+z) factor; please clarify whether this double counting is intended and how the random-pair term is weighted.
- [Figure 7] The caption should define the hatched region and state whether it includes parameter uncertainty; as presented, the hatched curve has no error band despite being derived from a posterior.
- [Section 4.1] The statement that the 100 cMpc foreground-background separation requirement 'eliminates approximately half of the possible FRB galaxy pairs' should specify which mass bin and which redshift cuts it refers to, since the fraction will vary with the galaxy sample.
- [Table 1 footnote] The quantity SNR_DM is central to the NFW-disagreement claim, but the table caption does not define the exact model vector and data bins used to compute it; please spell this out in the text or caption.
Circularity Check
No significant circularity: the DM-galaxy detection is a direct measurement, and the halo-model, simulation, and kSZ comparisons are openly fitted or independent external inputs.
full rationale
The central result is a measured cross-correlation between FRB deltaDM and DESI BGS galaxy positions; the estimator (Eq. 4) combines data and randoms and does not inject the claimed result as an input. The 6.5 sigma detection is defined against a null model (m=0) with Eq. 8, and the NFW comparison uses a fixed no-feedback template, not a parameter fitted to the same data. The halo-model and FLAMINGO curves are explicitly fits: Section 5.2 states the three BCEmu parameters are free and fitted to the real-space measurement, and Figure 7 is labeled as 'determined from the baryonification halo model fit to our log10 M*/M>10 measurement,' so no fitted parameter is renamed as a prediction. The harmonic-space SNR uses the real-space best-fit halo model for the model vector and covariance, but the harmonic-space data are not used in that fit, making this a cross-check rather than a self-referential derivation. The kSZ comparison uses the external kSZ measurement of Hadzhiyska et al. (2026); the FRB signal serves as an independent electron-density anchor, and the f sigma8 constraint is explicitly conditional ('assuming that the kSZ analyses properly calibrated r'). Self-citations (e.g., Connor et al. 2025 for <DM_host>; Hadzhiyska et al. 2026 for halo-mass calibration) provide standard or external inputs, not load-bearing uniqueness arguments. The paper's own disclosure that the jackknife SNR shifts by about 1 sigma when Npatch changes by a factor of two (Section 4.1) is a covariance-estimation caveat, not a circular step. No equation or parameter in the paper reduces by construction to its own input.
Assumptions & free parameters
free parameters (4)
- log10 Mc =
14.3, 13.4, 12.0 for the three mass bins
- theta_ej =
4.4, 4.9, 3.7 for the three mass bins
- eta =
0.24, 0.24, 0.19 for the three mass bins
- A_flamingo =
1.1, 1.2, 1.2 for the three mass bins
assumptions (7)
- domain assumption The mean cosmological DM can be subtracted using fd=0.94, fe=0.88, and <DMhost>=150/(1+z) pc/cm3, and any error does not correlate with foreground galaxies.
- domain assumption The ne2001 model adequately describes the Milky Way electron column at the FRB positions.
- domain assumption The jackknife covariance with Npatch=150 correctly estimates the uncertainty of a 130-FRB measurement, including correlations between radial bins.
- domain assumption The baryonification halo model with fixed HOD parameters calibrated externally describes the galaxy-electron correlation.
- ad hoc to paper The NFW/no-feedback model, in which gas traces the underlying dark matter, is the correct baseline for a universe without baryonic feedback.
- domain assumption The 100 comoving Mpc foreground-background separation removes all correlation with the FRB host environment.
- domain assumption Photometric redshifts and stellar masses from Zhou et al. 2023 have small enough errors that the correlation is only mildly convolved.
invented entities (1)
-
None
Cite this review
Pith. "Pith review of A new measurement of the FRB DM-galaxy cross correlation and a first joint analysis with the kinematic SZ effect." pith.science (2026). https://pith.science/paper/BXQLCRBC
@misc{pith2026260811296,
author = {Pith},
title = {Pith review of: A new measurement of the FRB DM-galaxy cross correlation and a first joint analysis with the kinematic SZ effect},
year = {2026},
howpublished = {\url{https://pith.science/paper/BXQLCRBC}},
note = {Machine review of arXiv:2608.11296}
}
abstract
Understanding the distribution of cosmic baryons is crucial for advancing cosmology and galaxy formation. Localized Fast Radio Bursts (FRBs) are a promising new probe of the diffuse gas, but measurements thus far have been limited by small sample size. In this work, we measure the FRB dispersion measure (DM)-galaxy cross correlation with 130 localized FRBs, including new spectroscopic host redshifts from the DSA-110, and the DESI Legacy Survey Bright Galaxy Sample. We detect this signal at the highest significance to date ($6.5\sigma$) in both configuration and harmonic space. By comparing to simulations and a halo model, we demonstrate that this statistic can constrain the strength of baryonic feedback. Our measurements disfavor a no-feedback scenario in which gas traces the underlying dark matter at $\sim\,9\sigma$. In addition to small scale feedback, this represents one of the first direct measurements of the clustering of electrons on scales larger than a few Mpc. We compare our measurement to recent kinematic Sunyaev-Zeldovich effect (kSZ) studies, which show good agreement despite the differences in observational methods and sample selection. Finally, we make a first attempt at breaking the kSZ optical depth degeneracy with FRBs, jointly measuring the growth rate of large-scale structure $f\sigma_8$. With future samples, FRB two-point statistics will provide precision constraints on the distribution of cosmic baryons and complement other probes.
Figures
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Reference graph
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