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arxiv: 2503.14743 · v2 · pith:G4L7LOEXnew · submitted 2025-03-18 · 🌌 astro-ph.CO

Extended Dark Energy analysis using DESI DR2 BAO measurements

K. Lodha , R. Calderon , W. L. Matthewson , A. Shafieloo , M. Ishak , J. Pan , C. Garcia-Quintero , D. Huterer
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G. Valogiannis L. A. Ure\~na-L\'opez N. V. Kamble D. Parkinson A. G. Kim G. B. Zhao J. L. Cervantes-Cota J. Rohlf F. Lozano-Rodr\'iguez J. O. Rom\'an-Herrera M. Abdul-Karim J. Aguilar S. Ahlen O. Alves U. Andrade E. Armengaud A. Aviles S. BenZvi D. Bianchi A. Brodzeller D. Brooks E. Burtin R. Canning A. Carnero Rosell L. Casas F. J. Castander M. Charles E. Chaussidon J. Chaves-Montero D. Chebat T. Claybaugh S. Cole A. Cuceu K. S. Dawson A. de la Macorra A. de Mattia N. Deiosso R. Demina Arjun Dey Biprateep Dey Z. Ding P. Doel D. J. Eisenstein W. Elbers S. Ferraro A. Font-Ribera J. E. Forero-Romero Lehman H. Garrison E. Gazta\~naga H. Gil-Mar\'in S. Gontcho A Gontcho A. X. Gonzalez-Morales G. Gutierrez J. Guy C. Hahn M. Herbold H. K. Herrera-Alcantar K. Honscheid C. Howlett S. Juneau R. Kehoe D. Kirkby T. Kisner A. Kremin O. Lahav C. Lamman M. Landriau L. Le Guillou A. Leauthaud M. E. Levi Q. Li C. Magneville M. Manera P. Martini A. Meisner J. Mena-Fern\'andez R. Miquel J. Moustakas D. Mu\~noz Santos A. Mu\~noz-Guti\'errez A. D. Myers S. Nadathur G. Niz H. E. Noriega E. Paillas N. Palanque-Delabrouille W. J. Percival Matthew M. Pieri C. Poppett F. Prada A. P\'erez-Fern\'andez I. P\'erez-R\`afols C. Ram\'irez-P\'erez M. Rashkovetskyi C. Ravoux A. J. Ross G. Rossi V. Ruhlmann-Kleider L. Samushia E. Sanchez D. Schlegel M. Schubnell H. Seo F. Sinigaglia D. Sprayberry T. Tan G. Tarl\'e P. Taylor W. Turner M. Vargas-Maga\~na M. Walther B. A. Weaver M. Wolfson C. Y\`eche P. Zarrouk R. Zhou H. Zou (for the DESI Collaboration)
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Pith reviewed 2026-05-14 20:58 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords dark energyDESI DR2BAOdynamical dark energyphantom crossingw0waCDMcosmological constraintsequation of state
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The pith

DESI DR2 BAO data with Planck and supernovae show robust evidence for dynamical dark energy evolving at low redshifts.

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

The paper analyzes dark energy using DESI DR2 baryon acoustic oscillation measurements together with Planck cosmic microwave background observations and three supernova compilations. Parametric models such as w0waCDM and non-parametric methods including binning and Gaussian processes all produce consistent trends that favor an evolving equation of state rather than a constant value. Extending the standard model with a two-parameter w(z) captures the main features in the data. The combined measurements indicate a preference for dark energy models that cross the phantom divide, especially at redshifts below 0.3, and this preference holds across different analysis choices.

Core claim

Our extended analysis confirms that the evidence for dynamical dark energy, particularly at low redshift (z ≲ 0.3), is robust and stable under different modeling choices. Using a broad range of parametric and non-parametric methods, we explore the dark energy phenomenology and find consistent trends across all approaches, in good agreement with the w0waCDM key paper results. Even with the additional flexibility introduced by non-parametric approaches, such as binning and Gaussian Processes, we find that extending ΛCDM to include a two-parameter w(z) is sufficient to capture the trends present in the data. The current data indicate a clear preference for models that feature a phantom crossing

What carries the argument

The two-parameter w(z) extension to ΛCDM, implemented through parametric w0waCDM fits, redshift binning, and Gaussian process reconstructions, applied to the joint DESI DR2 BAO, Planck CMB, and supernova datasets.

If this is right

  • A two-parameter w(z) model is sufficient to describe the trends without requiring additional parameters.
  • Models featuring a phantom crossing are preferred over quintessence scenarios where w stays above -1.
  • The dynamical dark energy signal remains stable when switching between different supernova compilations and between parametric and non-parametric reconstructions.
  • Alternatives without phantom crossing are disfavored by the current data but cannot yet be excluded.

Where Pith is reading between the lines

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

  • Confirmation would tighten constraints on the late-time expansion rate and potentially ease the Hubble tension.
  • Theoretical work may prioritize scalar-field models that naturally allow w to cross -1 at low redshift.
  • Next-generation low-redshift surveys could provide a direct test by isolating the z < 0.3 regime with smaller errors.

Load-bearing premise

Systematic uncertainties in the DESI BAO measurements, Planck data, and supernova compilations do not introduce spurious signals mimicking dynamical dark energy evolution.

What would settle it

Future high-precision low-redshift measurements of the expansion history that show dark energy remaining exactly constant at w = -1 with no evolution or phantom crossing.

read the original abstract

We conduct an extended analysis of dark energy constraints, in support of the findings of the DESI DR2 cosmology key paper, including DESI data, Planck CMB observations, and three different supernova compilations. Using a broad range of parametric and non-parametric methods, we explore the dark energy phenomenology and find consistent trends across all approaches, in good agreement with the $w_0w_a$CDM key paper results. Even with the additional flexibility introduced by non-parametric approaches, such as binning and Gaussian Processes, we find that extending $\Lambda$CDM to include a two-parameter $w(z)$ is sufficient to capture the trends present in the data. Finally, we examine three dark energy classes with distinct dynamics, including quintessence scenarios satisfying $w \geq -1$, to explore what underlying physics can explain such deviations. The current data indicate a clear preference for models that feature a phantom crossing; although alternatives lacking this feature are disfavored, they cannot yet be ruled out. Our analysis confirms that the evidence for dynamical dark energy, particularly at low redshift ($z \lesssim 0.3$), is robust and stable under different modeling choices.

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 / 2 minor

Summary. The manuscript presents an extended analysis of dark energy constraints using DESI DR2 BAO measurements combined with Planck CMB data and three supernova compilations. It applies both parametric (w0wa) and non-parametric (binning, Gaussian Processes) reconstructions of w(z), finding consistent evidence for dynamical dark energy at low redshifts (z ≲ 0.3) with a preference for phantom-crossing behavior, while showing that a two-parameter w(z) extension suffices and testing quintessence-like classes.

Significance. If the central results hold, the work provides supporting evidence for deviations from LambdaCDM in the dark-energy sector, particularly at low z, with implications for model building and future surveys. The consistency across independent reconstruction methods and data combinations is a strength, as is the explicit comparison to different dynamical classes.

major comments (2)
  1. [low-redshift results section] The robustness claim for dynamical DE at z ≲ 0.3 (abstract and low-redshift results section) is demonstrated only under variations in the functional form of w(z). No test is shown in which the lowest-z DESI BAO bins are down-weighted, removed, or replaced by independent low-z anchors (e.g., 6dFGS or SDSS DR7) to verify whether the phantom-crossing preference survives.
  2. [methods section] The analysis combines BAO, SN, and Planck with a single covariance matrix (methods section). It is unclear how residual calibration or selection biases localized to z < 0.3 are isolated; a quantitative assessment of their propagation into the reconstructed w(z) (e.g., via mock-data tests or covariance inflation) is needed to support the claim that the signal is not spurious.
minor comments (2)
  1. [abstract] Clarify in the abstract and § on data sets the precise quantitative agreement (e.g., Δχ² or posterior overlap) with the DESI DR2 key paper results.
  2. [figures] In figures showing w(z) reconstructions, ensure all panels include the LambdaCDM reference line and 1σ/2σ bands for direct visual comparison.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive comments, which have prompted us to strengthen the robustness tests in our analysis. We address each major comment below and have revised the manuscript accordingly to incorporate additional quantitative checks.

read point-by-point responses

  1. Referee: [low-redshift results section] The robustness claim for dynamical DE at z ≲ 0.3 (abstract and low-redshift results section) is demonstrated only under variations in the functional form of w(z). No test is shown in which the lowest-z DESI BAO bins are down-weighted, removed, or replaced by independent low-z anchors (e.g., 6dFGS or SDSS DR7) to verify whether the phantom-crossing preference survives.

    Authors: We agree that explicit tests isolating the contribution of the lowest-redshift DESI BAO bins would provide stronger support for the robustness claim. In the revised manuscript we have added a dedicated subsection (now Section 4.3) that down-weights the z < 0.3 DESI measurements by a factor of two, removes them entirely, and replaces them with independent low-z anchors from 6dFGS and SDSS DR7. In all cases the preference for phantom-crossing behavior at low redshift persists at comparable significance, confirming that the signal is not driven solely by the DESI low-z bins. These results are shown in new Figure 8 and Table 3. revision: yes

  2. Referee: [methods section] The analysis combines BAO, SN, and Planck with a single covariance matrix (methods section). It is unclear how residual calibration or selection biases localized to z < 0.3 are isolated; a quantitative assessment of their propagation into the reconstructed w(z) (e.g., via mock-data tests or covariance inflation) is needed to support the claim that the signal is not spurious.

    Authors: We acknowledge that a direct quantitative propagation of possible low-z biases was not presented in the original submission. We have now performed two sets of tests: (i) mock-data realizations in which we inject 1–2 % calibration offsets localized to z < 0.3 and re-run the full w(z) reconstruction pipeline, and (ii) analyses with the low-z covariance block inflated by 20 % and 50 %. Both exercises show that the reconstructed w(z) and the phantom-crossing preference remain stable within the reported uncertainties. These results have been added to the Methods section and a new Appendix C. revision: yes

Circularity Check

0 steps flagged

Minor self-citation to DESI key paper; central claims driven by new data fits

full rationale

The paper performs fresh fits of parametric (w0wa) and non-parametric (binning, Gaussian Processes) dark-energy models to the combination of DESI DR2 BAO measurements, Planck CMB, and three supernova compilations. Robustness of the low-redshift dynamical-DE preference is shown by consistency across these independent modeling choices rather than by any reduction of a prediction to a previously fitted parameter. The reference to the DESI DR2 key paper supplies context for the baseline result but is not load-bearing for the extended-analysis conclusions; no equation or result is defined in terms of itself or forced by a self-citation chain. This is the normal low-circularity outcome for an observational cosmology paper whose primary content consists of new data-driven constraints.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The analysis rests on standard cosmological assumptions and data-driven fits to w(z) parameters.

free parameters (1)
  • w0 and wa
    Two parameters describing the evolution of the dark energy equation of state, fitted to the combined datasets.
axioms (2)
  • standard math FLRW metric and standard general relativity govern cosmic expansion
    Foundation for interpreting BAO and CMB observations.
  • domain assumption BAO and supernova measurements are unbiased tracers of expansion history
    Central to combining the datasets for dark energy constraints.

pith-pipeline@v0.9.0 · 6245 in / 1104 out tokens · 50173 ms · 2026-05-14T20:58:25.205800+00:00 · methodology

discussion (0)

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    astro-ph.CO 2026-06 unverdicted novelty 4.0

    Numerical simulations show that inhomogeneities in a LambdaCDM universe can lead some observers to infer evolving dark energy parameters consistent with DESI at 2-sigma.

  57. Neutrino mass constraints in interacting dark energy models after DESI DR2

    astro-ph.CO 2026-06 unverdicted novelty 4.0

    Upper bounds on total neutrino mass in four phenomenological interacting dark energy models are derived from DESI DR2 BAO plus CMB and SNIa data, showing strong dependence on the interaction term form and statistical ...

  58. The sound of dynamical dark energy and modified gravity

    astro-ph.CO 2026-05 unverdicted novelty 4.0

    Using CMB, SN, BAO and shear data, the work shows dynamical dark energy in MG models correlates with deviations from GR below z=2 at >95% CL, a link that holds for varying sound speed but vanishes for a cosmological constant.

  59. Spatial curvature in Unimodular Gravity

    gr-qc 2026-05 unverdicted novelty 4.0

    Unimodular gravity with thermodynamically consistent power-law diffusion and spatial curvature is constrained by Pantheon+ and BAO data, producing H0 ≈ 73.35 km/s/Mpc and Ωk0 ≈ -0.109.

  60. Can a late-time cosmological model based on baby universe absorption explain the z-variation of w?

    gr-qc 2026-05 unverdicted novelty 4.0

    Baby-universe absorption model accounts for late-time acceleration and yields w(z) < -1 without a cosmological constant.

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