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Cosmography with DESI-DR1 Cosmic Chronometers: Direct H(z) measurements from Luminous Red Galaxy ages

T0 review · 3 major / 5 minor · reviewed 2026-08-15 · deepseek-v4-flash

Pith's one-line read By dating 527,000 stacked DESI galaxies, this paper measures the expansion rate from z=0.36 to z=0.80 without assuming a cosmological model.

desk verdict A genuinely new DESI cosmic-chronometer H(z) dataset with a clean cosmographic core, but the 'comprehensive' systematic budget omits the SPS-model uncertainty the authors themselves flag as comparable. read the letter →

arxiv 2608.13178 v1 pith:2BIGKKVC submitted 2026-08-13 astro-ph.CO astro-ph.GA

classification astro-ph.COastro-ph.GA
keywords cosmicchronometersHubbleparameterDESIDR1luminousredgalaxiesLickindicesstellarpopulationagescosmographyH(z)covariancematrix
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

DESI's nearly three million luminous red galaxies can be turned into cosmic chronometers: passively evolving galaxies whose measured ages trace how long the Universe took to expand between redshifts. This paper stacks more than half a million spectroscopically clean DESI spectra in velocity-dispersion and redshift bins, extracts stellar ages from Lick absorption indices, and reads the expansion rate off the slope of the age-redshift relation. The central result is a model-independent Hubble-parameter estimate at redshift 0.57, $H=95.1^{+10.9}_{-6.0}$ (stat.) $\pm 11.3$ (syst.) km s$^{-1}$ Mpc$^{-1}$, plus a correlated $H(z)$ curve from $z=0.36$ to $0.80$ with its covariance matrix. A classical finite-difference estimate from the reddest, most massive galaxies gives $H(z\approx0.61)=88.5^{+6.7}_{-12.6}$ (stat.) $\pm 8.1$ (syst.) km s$^{-1}$ Mpc$^{-1}$. If these hold, cosmologists gain a new independent check on cosmic expansion in a redshift range where chronometer data are sparse.

What carries the argument

The carrying object is the stacked age-redshift relation. DESI LRG spectra are divided into seven velocity-dispersion strata, stacked in adaptive redshift bins to a signal-to-noise near 150, and assigned ages by fitting a set of Lick indices with the TMJ stellar population synthesis model, which predicts index strengths for given age, metallicity, and $\alpha$-enhancement. The slope of age versus redshift is then converted into $H(z)$ either by a pivotal-redshift cosmography, a Taylor expansion of $(1+z)H(z)$ around the median sample redshift $z_0=0.57$ truncated at third order, or by the classical finite-difference formula. The simplification that carries the argument is that each stack behaves as a simple stellar population, so age differences between stacks are cosmic time differences.

What would settle it

Repeat the pipeline with the archaeological redshift cap removed or shifted, for example from 2.5 Gyr to 4 Gyr, and with a different $z(t)$ conversion; if the resulting $H(z_0=0.57)$ moves by more than the quoted $\pm 11.3$ km s$^{-1}$ Mpc$^{-1}$ systematic, the cut is biasing the slope rather than merely limiting the redshift window.

Watch

Extended reading notes

Core claim

Stacking DESI-DR1 luminous red galaxy spectra in velocity-dispersion strata and adaptive redshift bins produces age-redshift relations whose slope carries a model-independent measurement of the expansion rate. Fitting these relations with a third-order Taylor expansion of $H(z)$ about a pivotal redshift $z_0=0.57$ gives $H(z_0=0.57)=95.1^{+10.9}_{-6.0}$ (stat.) $\pm 11.3$ (syst.) km s$^{-1}$ Mpc$^{-1}$, together with a sampled $H(z)$ from $z=0.36$ to $0.80$ and a total covariance matrix. A classical finite-difference estimate $H(z)\approx -\Delta z/[\Delta t(1+z)]$ applied to the reddest, most massive galaxies gives $H(z\approx0.61)=88.5^{+6.7}_{-12.6}$ (stat.) $\pm 8.1$ (syst.) km s$^{-1}$ Mpc$^{-1}$. The two routes are independent, and the paper provides the full chain and covariance so the correlated nature of the cosmographic reconstruction can be used directly in model tests.

Load-bearing premise

The load-bearing premise is that the redshift cap imposed on each velocity-dispersion group, built from an assumed 2.5 Gyr minimum reliable age and an age-mass scaling relation translated to redshift with a Planck-$\Lambda$CDM cosmic-age curve, removes only unreliable young galaxies and does not tilt the age-redshift slope from which $H(z)$ is read.

Editorial extensions

If this is right

  • A full covariance-matrix likelihood can now be used to test any model of $H(z)$ between $z=0.36$ and $z=0.80$ without the model being assumed to build the data.
  • The $z\approx0.61$ measurement, coming from the reddest envelope of the most massive galaxies, is the purest and most stringent of the two local estimates.
  • The two finite-difference values are independent and can be combined with existing cosmic-chronometer compilations because they come from physically different galaxy populations.
  • Pivotal cosmography anchored at the median redshift of a dataset is a transferable way to turn future chronometer datasets into continuous $H(z)$ reconstructions.

Reading between the lines

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

  • If the archaeological age floor is even mildly wrong for low-$\sigma$ galaxies, the excluded high-redshift points may carry information about $H(z)$; re-running the fit without that cut would settle this.
  • Users should not treat adjacent bins of the released $H(z)$ sampling as independent; the covariance matrix encodes the fact that all bins share the global kinematic parameters, so pointwise combinations without the matrix would understate errors.
  • Applying the same stacking and cosmographic pipeline to future DESI releases could push the method beyond the current $z\approx0.8$ ceiling set by the rest-frame iron-index wavelength window.
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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 / 5 minor

Summary. This paper applies the cosmic chronometer method to DESI-DR1 luminous red galaxies. The authors stack ~527,000 spectroscopically selected passive galaxies in velocity-dispersion and redshift bins, measure Lick indices, fit Thomas et al. (2011) stellar population models to derive ages, and build t-z relations for five velocity-dispersion groups. They then fit a pivotal-redshift cosmographic expansion around z0=0.57 to obtain H(z0)=95.1^{+10.9}_{-6.0} (stat.) ± 11.3 (syst.) km/s/Mpc, and provide a 45-point correlated H(z) sampling with a full covariance matrix. They also derive two finite-difference H(z) measurements from disjoint sets of velocity-dispersion groups, the more precise being H(z≈0.61)=88.5^{+6.7}_{-12.6} (stat.) ± 8.1 (syst.) km/s/Mpc. The paper releases stacked spectra, spectral-feature measurements, MCMC chains, and the H(z) covariance products.

Significance. If the quoted constraints are unbiased, this is a valuable addition to the cosmic-chronometer literature: it extends the method to DESI-scale samples, provides a continuously sampled H(z) band over 0.36<z<0.8, and supplies the full covariance needed for cosmological use. The velocity-dispersion corrections, the stacking methodology, and the explicit treatment of data-management systematics are careful and reproducible from the released products. The recovery of a downsizing-like age scaling relation is a useful consistency check. However, the central value and error bars rest on selection and SPS-model assumptions whose quantitative impact is not fully demonstrated; the SPS-model systematic is explicitly acknowledged in Section 6 as likely comparable to the entire internal systematic budget but is not included in the quoted errors. The paper is therefore not yet at the level of support claimed in the abstract.

major comments (3)
  1. [Section 4.4 and Section 6] The systematic uncertainty budget is incomplete in a way that directly affects the central claim. Section 4.4 restricts the systematic budget to data-management choices (S/N level, archaeological/cosmological prescriptions, quality flags), while Section 6 states that the choice of SPS model is a known source of systematic shift and that 'existing literature suggests that this contribution is likely of the same order as our combined internal systematics.' Since the H(z) measurement is extracted from the slope of the t-z relation through Eqs. (10)-(11), a redshift-dependent SPS bias in the age estimates changes the slope and hence shifts H(z) by an amount potentially comparable to the quoted systematic errors. The abstract's phrase 'comprehensive analysis of all the methodological choices' is therefore not supported. The authors should either include a cross-SPS comparison (e.g., TMJ versus an independent model such as α-MC or Knowles et al.) or quantitatively propagate the literature estimate of SPS scatter into the systematic budget for both the cosmographic and finite-difference results.
  2. [Section 4, velocity-dispersion binning paragraph; Appendix C] The exclusion of the 355<σ[km/s]<400 velocity-dispersion group is not documented as promised. The text says 'Further details on this are given in section C,' but Appendix C discusses quality flags and the z≈0.5 oscillation and contains no analysis of the 355-400 group. This is a data-driven selection applied before the cosmographic fit: one of six velocity-dispersion groups is removed because of a reported small age offset relative to the 320-355 group. The authors should show the t-z relation for this group, quantify the offset and its origin, and demonstrate that the cosmographic results are insensitive to including or excluding it. Without this, a reader cannot assess whether the exclusion is a benign redshift-window choice or a systematic that biases the fitted slope.
  3. [Section 3, Fig. 1; Section 4.4] The 'archaeological coherence cut' couples the sample selection to the same stellar-population modeling used in the age fit. The redshift cap for each velocity-dispersion group is set by translating an age floor of 2.5 Gyr to redshift using the A25 t(σ) scaling relation and a Planck-ΛCDM z(t) prescription. The paper argues that this only limits the redshift window and does not bias the fit, and Section 4.4 does vary t(σ) and z(t) prescriptions in the systematic budget. However, all adopted t(σ) relations are empirical fits to similar data, and the cut removes exactly the low-mass, high-redshift stacks where the TMJ model response is poorest. If the scaling relation is biased, the selection is correlated with the age-redshift slope. I ask for an additional robustness test: for example, fit the t-z relations with and without the excluded low-mass high-z stacks using an independent age indicator, or show explicitly how much the fitted H(z) changes when the age floor is varied from 2.0 to 3.0 Gyr in addition to the listed t(σ) prescriptions.
minor comments (5)
  1. [Abstract] The phrasing 'we intend apply the cosmic chronometer method' should be 'we intend to apply'.
  2. [Figure C.2 caption] The caption says 'against redshift on the left' in both clauses; the second panel is presumably on the right.
  3. [Figures 5 and 7] The legend for Jimenez et al. (2023) is labeled 'Phot.' in Fig. 5 and 'Lick' in Fig. 7; the label should be consistent.
  4. [Section 4.4] The number of alternative configurations entering the standard deviation for the systematic budget is not stated; listing the count of S/N levels, prescription combinations, and quality-flag combinations would improve transparency.
  5. [Section 5.1] The sentence describing the covariance contribution 'C_syst,ij = σ_syst(zi) σ_syst(zj)' assumes perfect correlation across all redshift bins; a brief justification of this fully correlated model would help users of the released covariance.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: H(z) is derived from the slope of externally calibrated stellar ages, not from the Planck-based redshift cap.

full rationale

The derivation chain is self-contained: DESI LRG spectra are stacked in velocity-dispersion and redshift bins, Lick indices are measured, ages are fit with the TMJ stellar population model, and H(z) follows from the resulting t–z relation via either the pivotal cosmographic fit (Eqs. 8–11) or the finite-difference approximation (Eqs. 1, 14). No step fits H(z) to a quantity that already contains H(z). The only cosmological input before the fit is the 'archaeological coherence cut' (Sec. 3, Fig. 1), which uses the A25 t(σ) scaling relation and Planck-ΛCDM z(t) to impose a 2.5 Gyr age floor in redshift for each velocity-dispersion bin. The paper explicitly states that this rule 'does not provide a prior for the t−z relations' and only limits the redshift window of observation; the final H(z) values are not numerically derived from the Planck z(t) or A25 t(σ) relations. Moreover, the systematic budget varies both the t(σ) and z(t) prescriptions, finding the cut to be a minor contributor. The extensive citations to A25 are methodological (stacking, Lick-index set, priors, cosmographic framework) and do not inject A25's H(z) results into the present fit. The acknowledged omission of SPS-model variation (Sec. 6) is a robustness and accuracy limitation—it affects the quoted systematic error bars—but it is not a circularity, because the H(z) measurement does not reduce to the SPS model choice by construction. Comparisons against external literature H(z) points and the Planck-ΛCDM curve further confirm that the result is not forced by the input assumptions.

Assumptions & free parameters 9 free parameters · 7 assumptions · 0 invented entities

The main external inputs are the TMJ stellar population model, the DESI catalog, and the A25 scaling relations; the paper's own fitting introduces several hand-chosen thresholds (age floor, S/N, metallicity cap, quality flags) that enter the t-z data selection. No new physical entities are postulated.

free parameters (9)
  • H_z0 (pivotal Hubble parameter) = 95.1^{+10.9}_{-6.0} km/s/Mpc (stat), ±11.3 km/s/Mpc (syst)
    Amplitude parameter of the cosmographic fit that sets the H(z) scale; fitted to the t-z data.
  • q_z0 (deceleration parameter) = 1.0^{+2.7}_{-1.8}
    Second cosmographic parameter in Eq. (8), fitted with uniform prior [-10,10]; weakly constrained.
  • j_z0 (jerk parameter) = unconstrained; posterior matches prior, Gaussian only with priors around ±200
    Third cosmographic parameter; the posterior provides no information within the baseline prior.
  • t_z0,v (pivotal ages per velocity dispersion group) = posteriors in Fig. D.1; not tabulated numerically
    One per group, absorbed the age zero-point in Eq. (10); fitted jointly with the cosmographic parameters.
  • common slope m for local H(z) fits = not given explicitly; local results H(z≈0.55)=104.5 and H(z≈0.61)=88.5 km/s/Mpc
    Slope in Eq. (14) for finite-difference measurements, with per-group intercepts t_z0,v also fitted.
  • Archaeological age cut = 2.5 Gyr
    Hand-chosen lower age cut to avoid TMJ low-age inaccuracy; determines redshift caps per group.
  • Stack S/N threshold = 150 (baseline)
    Hand-chosen signal-to-noise level for stacked spectra; varied from 50 to 150 to estimate systematics.
  • Metallicity prior cap = [Z/H] < 0.26
    Prior floor from A25 to keep the TMJ model in a reliable regime; alternative priors tested in Appendix B.
  • Quality flag thresholds = S/N(z)>50, σ_z<0.01, S/N(t)>5, σ_t<1 Gyr
    Thresholds chosen to remove low-redshift high-age stacks and unstable points; systematic tests vary them.
assumptions (7)
  • standard math The universe is described by an FLRW metric, so H = -1/(1+z) dz/dt is the expansion rate.
    The cosmic chronometer method assumes a homogeneous isotropic background; standard in cosmology.
  • domain assumption DESI LRGs are passively evolving galaxies that formed in short bursts and have no significant recent star formation.
    Required for age(z) to trace cosmic time; the sample selection aims to enforce this.
  • domain assumption Stacked spectra can be approximated as a simple stellar population for age and metallicity fitting.
    The TMJ model predicts single-burst populations, and the likelihood in Eq. (9) assumes this.
  • domain assumption The TMJ SPS model returns unbiased ages for t > 2.5 Gyr and [Z/H] < 0.26.
    The redshift caps and metallicity prior rely on this model response.
  • ad hoc to paper The A25 t(σ) scaling relation and a Planck-ΛCDM z(t) prescription translate age cuts into redshift windows without biasing the t-z trend.
    Used in Fig. 1 to define allowed redshift ranges; the paper asserts no bias but does not demonstrate independence.
  • domain assumption Velocity dispersion groups have parallel t-z relations, so a common slope with per-group offsets is a valid model.
    Assumed for the local H(z) measurements in Section 5.2.
  • ad hoc to paper The z≈0.5 oscillation in t-z is a systematic that can be removed with quality flags.
    The oscillation is excluded by the flags; the paper argues that including those points leaves posteriors unchanged.

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Cite this review

Pith. "Pith review of Cosmography with DESI-DR1 Cosmic Chronometers: Direct H(z) measurements from Luminous Red Galaxy ages." pith.science (2026). https://pith.science/paper/2BIGKKVC

@misc{pith2026260813178,
  author       = {Pith},
  title        = {Pith review of: Cosmography with DESI-DR1 Cosmic Chronometers: Direct H(z) measurements from Luminous Red Galaxy ages},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/2BIGKKVC}},
  note         = {Machine review of arXiv:2608.13178}
}
abstract

Providing robust redshift estimates for almost 3 million luminous red galaxies (LRGs), the Dark Energy Spectroscopic Instrument (DESI) offers a unique opportunity to test the expansion rate of the Universe with independent approaches. We apply the cosmic chronometer method to derive new, independent constraints on the Hubble parameter at 0.3<z<1.2 from the differential age evolution of DESI LRGs. We select spectra applying spectroscopic cuts to ensure sample purity and remove contamination by star-forming objects, then build a robust sample of cosmic chronometers (CCs) by stacking to obtain stable, high signal-to-noise (S/N) spectra, which also serves as a democratic binning choice for the $t-z$ plane. Ages are estimated by measuring Lick indices on the stacked spectra and fitting them with a theoretical stellar population model. We obtain $t-z$ relations from which we derive $H(z)$ constraints via two independent approaches: a fit with a pivotal-redshift cosmography, and a direct estimate from the original CC method. The cosmographic fit yields posteriors for the kinematic parameters $\{H_{z_0}, q_{z_0}, j_{z_0}\}$ compatible with currently considered cosmologies, giving a precision-level estimate of $H(z)$. We provide the maximum-a-posteriori (MAP) $H(z)$ estimate, an array of the median confidence region in the $H-z$ plane, and its covariance matrix. We also leverage the redshift distributions of the $t-z$ relation for different velocity dispersion groups to obtain two independent local measurements using the discrete approximation $H(z) \approx -\Delta z/[\Delta t (1+z)]$; the one from the reddest envelope of CCs gives $H(z \approx 0.61) = 88.5^{+6.7}_{-12.6}$ (stat.) $\pm 8.1$ (syst.) km s$^{-1}$ Mpc$^{-1}$. Systematic uncertainties for both the cosmographic and discrete $H(z)$ measurements come from a comprehensive analysis of all methodological choices in the data treatment.

Figures

Figures reproduced from arXiv: 2608.13178 by the authors.

Figure 2
Figure 2. Distribution of the Dn4000 index and g − r (observed frame) colour of the galaxies in the VAC from DESI (light grey), parent sample as defined in the text (dark blue) and spectroscop￾ically selected sample (yellow). With this, we would have completed all the conditions for the spectroscopic selection (also "Pre-SPS fit"). Then, a further qual￾ity selection will be applied in the t−z stacks plane after the SPS model … view at source ↗
Figure 3
Figure 3. t − z relations in groups of velocity dispersion. Represented only the data with S/N(t) > 5.0, dt < 1.0 Gyr and dz < 0.01. Different colours represent different velocity dispersion groups, while blue and red tonalities represent the super-groups used to obtain the H(z) local measurements (sec. 5.2). For illustrative purpose we present with dashed lines the ΛCDM tendency with Planck Collaboration et al. (2020) parame… view at source ↗
Figure 4
Figure 4. Posterior probability distribution for the cosmographic [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figures from the paper (3 more)
Figure 5
Figure 5. Figure 5: Hubble diagram populated with independent and punctual CC measurements from literature up to date in the region 0 [PITH_FULL_IMAGE:figures/full_fig_p010_5.png]
Figure 6
Figure 6. Figure 6: Comparison of statistical (solid dark grey) and systematic [PITH_FULL_IMAGE:figures/full_fig_p010_6.png]
Figure 7
Figure 7. Figure 7: For literature data, same as Fig [PITH_FULL_IMAGE:figures/full_fig_p011_7.png]

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Reviewed August 15, 2026 · model on record in the stance chip above.