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REVIEW 3 major objections 4 minor 106 references

Cosmic homogeneity: the effect of redshift-space distortions and bias and cosmological constraints

T0 review · 3 major / 4 minor · reviewed 2026-08-15 · deepseek-v4-flash

Pith's one-line read Fitting the angular correlation dimension $D_2$ only above 1.25 degrees with a linear Kaiser model—omitting the Finger-of-God term—recovers galaxy bias and gives $\omega_m = 0.142^{+0.014}_{-0.022}$, consistent with CMB measurements.

desk verdict The bias analysis is solid, but the omega_m agreement with Planck rests on a cut chosen after the fact to minimize tension; also fix the abstract inconsistency. read the letter →

arxiv 2507.18720 v2 pith:IDSTLP3V submitted 2025-07-24 astro-ph.CO

classification astro-ph.CO
keywords cosmichomogeneityangularcorrelationdimensionredshift-spacedistortionsFinger-of-Godeffectgalaxybiasphysicalmatterdensitycosmologicalconstraintsluminousredgalaxies
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper argues that a cumulative angular clustering statistic, the correlation dimension $D_2(\theta)$, can bypass the need to model the nonlinear Finger-of-God effect in galaxy surveys. Its central claim is that when the $D_2$ curve is fitted only for angular separations $\theta \geq 1.25^\circ$ (roughly 20 $h^{-1}$ Mpc at the sample redshifts), the simplest linear Kaiser model recovers the galaxy bias and the physical matter density with negligible systematic error. Applied to luminous red galaxy samples from two large public data releases, the method gives $\omega_m = 0.142^{+0.014}_{-0.022}$, which agrees with current CMB analyses at the $0.2\sigma$ level. The payoff, if the claim holds, is that a careful scale cut can substitute for sophisticated nonlinear modeling in at least one summary statistic.

What carries the argument

The central object is the angular correlation dimension $D_2(\theta) = 2 + \frac{d}{d\ln\theta}\ln\left[1+\frac{1}{1-\cos\theta}\int_0^\theta \omega(\theta')\sin\theta'\,d\theta'\right]$, a cumulative logarithmic-derivative statistic built from the angular two-point correlation function $\omega(\theta)$. It is the fractal (correlation) dimension of the projected galaxy distribution, and the paper uses it because the integration reduces bin-to-bin covariance and the logarithmic derivative responds to the shape rather than the amplitude of clustering. The argument is carried by pairing $D_2$ with a deliberately simple redshift-space model, the linear Kaiser power spectrum $P_{gg}^{(s)}(k,\mu;b)=b^2(1+\beta\mu^2)^2P_{\delta\delta}^{(r)}(k)$ with $\beta=f/b$, and no Finger-of-God damping term. The scale cut $\theta_{\min}=1.25^\circ$ is the mechanism that makes the missing Finger-of-God term harmless; the paper shows that this corresponds to comoving scales of roughly 18-23 $h^{-1}$ Mpc over the redshift range $0.46 \leq z \leq 0.74$.

What would settle it

Run the same analysis on a large suite of independent mock catalogs with a known input cosmology and a known pairwise velocity dispersion, fixing $\theta_{\min}=1.25^\circ$ before any comparison with the CMB; if the mean recovered $\omega_m$ is offset from the input by more than the quoted statistical uncertainty, or if the recovered bias deviates from the input by more than about 0.5%, the scale-cut claim is falsified.

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Extended reading notes

Core claim

The paper argues that the angular correlation dimension $D_2(\theta)$ responds to redshift-space distortions in a sharply scale-dependent way: the Finger-of-God effect inflates $D_2(\theta)$ and biases the inferred linear bias on small angles, but its influence falls below the systematic budget once the fit starts at $\theta_{\min} \approx 1.25^\circ$. Comparing the linear Kaiser model with nonlinear model-generated points and with realistic mock catalogs, the authors show that excluding $\theta < 1.25^\circ$ reduces the $D_2$ residuals from roughly 2% to roughly 1% and keeps the recovered bias within about 0.5% of the input value. Applied to real luminous red galaxy data, the same cut yields a bias $b \approx 2.03 \pm 0.01$ at $z \approx 0.555$, redshift-evolving bias values consistent with reference measurements, and a physical matter density $\omega_m = 0.142^{+0.014}_{-0.022}$ that agrees with current CMB analyses at the $0.2\sigma$ level. The proposed mechanism is that the cumulative structure of $D_2$ makes it insensitive to the amplitude of small-scale velocity noise, so a clean angular cut achieves what a more accurate Finger-of-God model would otherwise be needed for.

Load-bearing premise

The load-bearing premise is that the $1.25^\circ$ minimum scale is a fixed, physically motivated cutoff rather than a post-hoc choice; the paper selects the lowest $\theta_{\min}$ for which the inferred matter density agrees with the CMB, and if that selection is what produces the agreement, the central claim would not survive an a priori cut.

Editorial extensions

If this is right

  • If the central claim holds, future $D_2(\theta)$ analyses can measure galaxy bias with a one-parameter linear fit, removing the need to marginalize over a velocity-dispersion nuisance parameter.
  • A fixed cut at $\theta_{\min}=1.25^\circ$ should keep the systematic error on $D_2$ at or below roughly 1%, which is the paper's stated improvement over fitting from $0.5^\circ$.
  • The recovered $\omega_m = 0.142^{+0.014}_{-0.022}$ gives an independent, late-time probe of the matter density that agrees with CMB measurements at the $0.2\sigma$ level.
  • With the same cut, the joint constraints $\Omega_{m0}=0.254\pm0.023$ and $H_0=74.9^{+5.8}_{-7.9}\,\mathrm{km\,s^{-1}\,Mpc^{-1}}$ illustrate the method's reach, although the $H_0$ uncertainty is too large to arbitrate the Hubble tension.
  • The safe operating window $\theta_{\min} \in [1.25^\circ, 3^\circ]$ is a concrete recommendation that can be adopted directly by related analyses.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Not in the paper: if the scale-cut logic is correct, the same physical cutoff (about 20 $h^{-1}$ Mpc) should suppress Finger-of-God bias for other tracers such as quasars or emission-line galaxies, so predicting the required $\theta_{\min}$ from the tracer's velocity dispersion is a direct testable extension.
  • Not in the paper: the current result marginalizes over all redshift bins jointly, so publishing bin-by-bin $\omega_m$ posteriors would show whether the CMB agreement is a stable feature or is driven by a subset of the data.
  • Not in the paper: the $D_2(\theta)$ measurement is model-independent, but the interpretation of $\theta_{\min}=1.25^\circ$ as a physical scale depends on the fiducial cosmology, so the optimal cut should be recomputed if the fiducial model changes.
  • Not in the paper: combining the $D_2$-based bias measurement with galaxy-galaxy lensing or cosmic shear could break the bias-density degeneracy more cleanly than either probe alone.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The paper proposes the angular correlation dimension D2(θ) as a model-independent probe of cosmic homogeneity and as a tool for measuring galaxy bias and cosmological parameters. Using MultiDark-Patchy and EZmock mocks together with SDSS DR12/DR16 LRG data, the authors argue that restricting the D2 fit to angular scales above a minimum cut θ_min makes the linear Kaiser model (without an explicit Finger-of-God term) sufficient, yielding galaxy bias estimates consistent with reference values and a physical matter density ω_m = 0.142^{+0.014}_{-0.022} that agrees with Planck CMB. The central methodological claim is that a scale cut can replace detailed nonlinear RSD modeling.

Significance. The D2 statistic's reduced bin-to-bin correlations and the extensive validation against 1000 realistic mocks are genuine strengths, and the bias recovery at θ_min ≈ 1.25° is independently supported both by mocks and by reference bias estimates from [62]. If the scale-cut strategy is robust, it would provide a simple way to bypass FoG modeling for cosmological inference. However, the headline agreement with Planck is weakened by the post-hoc choice of θ_min, and the inconsistent abstract values must be resolved before the central claim can be accepted.

major comments (3)
  1. [Sec. 6, Fig. 12; Sec. 7] The choice θ_min = 1.25° for the ω_m constraint is selected from the same D2 data used to derive the constraint. Figure 12 scans ω_m(θ_min) and Sec. 7 states that 'The lowest θ_min that produced results consistent with Planck CMB was found to be 1.25°'. The reported 1σ interval ω_m = 0.142^{+0.014}_{-0.022} therefore conditions on a cut chosen to minimize tension with the external CMB value, and the error bar does not include the variance of that selection. This makes the claimed 0.2σ agreement with Planck partially by construction. Please either fix θ_min a priori using the mock/theoretical criteria of Sections 4.2 and 5.2 before inspecting the ω_m constraint, or present a selection-corrected analysis (e.g., report the full scan, use a data-blind pre-registered threshold, or marginalize over θ_min).
  2. [Abstract vs. Sec. 6] The reported central result is inconsistent across versions of the abstract. The arXiv metadata abstract states ω_m = 0.137^{+0.041}_{-0.059}, while the full-text abstract and Sec. 6 report ω_m = 0.142^{+0.014}_{-0.022}. These values are mutually incompatible, and neither is flagged as a typo. The correct value and uncertainties must be identified and used consistently in all versions of the paper, because the claimed agreement with Planck depends on which number is quoted.
  3. [Sec. 5.3, Table 4] The reduced chi-squared values for the three bias-evolution models are 4.57, 4.48, and 4.47 for 21 degrees of freedom, indicating that the scatter of the measured b(z) is substantially larger than the reported error bars. Since Bias Model 3 is used in the joint ω_m fit of Sec. 6, this large χ²_ν signals either underestimated errors or an incomplete bias model, either of which could propagate into the cosmological constraints. The paper should quantify the impact of this poor goodness-of-fit on the ω_m result, beyond the statement that alternative bias models do not significantly change the results.
minor comments (4)
  1. [Sec. 4.2] The threshold θ = 1.25° is introduced from a convergence argument over σ_p ∈ [0,600] km/s, but the mock-inferred pairwise dispersion is about 263 km/s; the dependence of the optimal θ_min on σ_p and redshift is not quantified. A quantitative criterion (e.g., where the fractional difference between models falls below a tolerance) would strengthen the case that the adopted cut is not arbitrary.
  2. [Sec. 5.3, Fig. 11] The black reference bias points from [62] are based on DR12 only, while the red points extend to DR16; clarify whether the comparison remains meaningful at z > 0.65, where no reference points are shown.
  3. [References] Reference [92] (Yi Wang et al., 'CDnet 2014: An expanded change detection benchmark dataset') appears unrelated to the redshift-space distortion modeling context in which it is cited; please verify and replace with the intended RSD reference.
  4. [Tables 1-2 and Sec. 6] There are minor typos, e.g., 'redshit bin means' in the Table 1 caption and 'previsouly' in Sec. 6; a careful proofread is recommended.

Circularity Check

1 steps flagged · score 4.0 of 10

The 0.2σ Planck agreement for ωm is partly by construction because θmin=1.25° is selected from the ωm(θmin) scan as the lowest cut consistent with Planck; the bias-recovery validation is independent, so the method itself is not circular.

  1. fitted input called prediction [Sec. 6 'Cosmological constraints' (Fig. 12) and Sec. 7 'Conclusions']
    "For the sake of example, for θmin = 1.25o we obtain a constraint of ωm(θmin = 1.25o) = 0.142+0.014 −0.022 from our data, which is in excellent agreement with the Planck CMB result, ωm = 0.1434 ± 0.0020, with a discrepancy of only 0.2σ. ... The lowest θmin that produced results consistent with Planck CMB was found to be 1.25◦. So, based on the previous analysis, we fixed θmin = 1.25◦."

    The scale cut selects which ωm measurement is reported and is chosen from a scan of the same D2 data against the external Planck value. The Conclusions state the adopted cut is 'the lowest θmin that produced results consistent with Planck CMB', so the 0.2σ agreement at θmin=1.25° is a selection outcome, not an independent prediction. The quoted 1σ interval excludes the variance of choosing the cut after seeing the tension curve; scanning many cuts and reporting the least-tension one forces agreement by construction. Mock-based bias recovery (Secs. 5.1–5.2) independently supports θmin≈1.25°, so the bias claim is not circular; only the Planck-agreement claim is partly constructed.

full rationale

The core D2 method is self-contained: Eq. 3.1 defines the angular correlation dimension, Eq. 3.6 gives the Landy–Szalay estimator, and the theoretical predictions follow from Eqs. 4.1–4.4. The claim that θmin≈1.25° suppresses FoG systematics is first motivated theoretically (Sec. 4.2, Fig. 5) and then validated on independent MultiDark-Patchy and EZmock mocks by comparing recovered bias with reference values from [62] (Sec. 5.2, Fig. 9). That part is genuine external validation, not circular. The circularity concern is confined to the cosmological-constraint section: θmin=1.25° is adopted for the final Ωm–H0 constraints after Fig. 12 shows that this cut is where the D2-based ωm comes into agreement with Planck, and the Conclusions describe the cut as 'the lowest θmin that produced results consistent with Planck CMB'. Hence the headline agreement (0.2σ) is partly by selection; a pre-registered cut would be needed to quote it as a prediction. I do not treat the paper's extensive self-citations to [31,32] as circular, because the relevant equations are reproduced in the text and the mock/reference comparisons provide independent support. Separately, there is an internal inconsistency between the arXiv metadata abstract (ωm=0.137+0.041-0.059) and the full-text abstract/Sec. 6 (ωm=0.142+0.014-0.022); this is a reporting error to be corrected, and it does not change the circularity verdict.

Assumptions & free parameters 4 free parameters · 7 assumptions · 0 invented entities

The parameter constraints use flat Lambda-CDM with Planck-fixed shape parameters, a linear bias model, a simplified Gaussian FoG model for mock validation, and a hand-tuned angular cut. No new entities are introduced; the main uncharged assumptions are the scale cut and the fiducial cosmology.

free parameters (4)
  • theta_min (minimum angular scale) = 1.25 degrees
    Chosen as the smallest angular cut that makes the D2-based omega_m tension with Planck drop below about 0.5 sigma; also checked against mocks. This is a hand-tuned analysis scale.
  • galaxy bias b = 1.8 to 2.3 across z = 0.46 to 0.74; b = 2.03 +/- 0.01 at z = 0.555
    Free parameter in fits of D2(theta); the paper reports b as a result from each redshift bin.
  • pairwise velocity dispersion sigma_p = 263 +/- 40 km/s for mock fit; also a 0 to 600 km/s grid
    Used only for mock and theoretical tests of the nonlinear model, not for the final cosmological constraints.
  • Bias model 3 parameters a1, a2 = a1 = 2.020 +/- 0.011, a2 = 0.944 +/- 0.131
    Parameterization of b(z) used in the MCMC analysis and marginalized over.
assumptions (7)
  • domain assumption Spatially flat Lambda-CDM with H(z) given by Eq. 3.5 and Planck 2018 fiducial values for n_s, A_s, Omega_k.
    Used to compute distances, the matter power spectrum, and theoretical D2; also used for the CMB comparison value.
  • domain assumption Scale-independent linear bias with f(z) = b(z) phi(z) and Kaiser model Eq. 4.1.
    Relates galaxy clustering to matter clustering and is assumed valid above theta_min.
  • ad hoc to paper Gaussian Finger-of-God damping model Eq. 4.2.
    A simplified dispersion model used to generate nonlinear mock data and estimate systematics; the paper acknowledges it is inaccurate at small scales.
  • domain assumption Top-hat redshift windows with narrow bins Delta z = 0.01.
    Used to project the 3D correlation function into the angular 2PACF and to avoid projection effects.
  • domain assumption Homogeneity threshold D2 = 1.98, corresponding to a 1% departure.
    Adopted from the literature to define theta_H; not central to the parameter constraints.
  • domain assumption CAMB plus HALOFIT matter power spectrum as the theoretical P(k).
    Input to Eq. 3.3 for the 3D correlation function.
  • standard math Landy-Szalay estimator is an unbiased estimator of the angular correlation function.
    Standard estimator used for all observational D2 measurements.

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Cite this review

Pith. "Pith review of Cosmic homogeneity: the effect of redshift-space distortions and bias and cosmological constraints." pith.science (2026). https://pith.science/paper/IDSTLP3V

@misc{pith2026250718720,
  author       = {Pith},
  title        = {Pith review of: Cosmic homogeneity: the effect of redshift-space distortions and bias and cosmological constraints},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/IDSTLP3V}},
  note         = {Machine review of arXiv:2507.18720}
}
abstract

We present a novel cosmological analysis based on the angular correlation dimension $D_2$ curve, a cumulative statistic derived from the two-point correlation function. Unlike traditional 3D approaches, angular $D_2$ is inherently less sensitive to nonlinear dynamical distortions, such as the small-scale Finger-of-God (FoG) effect. Using both MultiDark-Patchy and EZmock galaxy catalogs, we assess the scale-dependent impact of redshift-space distortions on $D_2$ and bias measurements. We demonstrate that the systematic errors associated with FoG modeling can be significantly reduced by restricting the analysis to appropriate minimum comoving angular scales of $\sim 1.25^{\circ} $, which corresponding to physical scales of $18$-$23\,h^{-1}\,\mathrm{Mpc}$ over the redshift range $0.46 \leq z \leq 0.74$ within the standard $\Lambda$CDM model. Since the observational estimative of $D_2(\theta)$ is not dependent on a cosmological model we obtain robust estimates of the galaxy bias and place competitive constraints on the physical matter density $\omega_m$. By applying this framework to SDSS DR12 and DR16 Luminous Red Galaxy data, we obtain $\omega_m = 0.137^{+0.041}_{-0.059}$ (1$\sigma$), which agrees with current CMB analyses. Our results highlight the potential of the angular $D_2$ curve as a model-independent and robust tool for cosmological parameter inference.

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