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arxiv: 2511.20757 · v2 · submitted 2025-11-25 · 🌌 astro-ph.CO · astro-ph.GA· gr-qc· hep-ph· hep-th

Reanalyzing DESI DR1: 2. Constraints on Dark Energy, Spatial Curvature, and Neutrino Masses

Anton Chudaykin , Mikhail M. Ivanov , Oliver H. E. Philcox This is my paper

Pith reviewed 2026-05-17 04:12 UTC · model grok-4.3

classification 🌌 astro-ph.CO astro-ph.GAgr-qchep-phhep-th
keywords DESIfull-shape analysisneutrino massdark energy equation of statespatial curvaturebispectrumeffective field theorycosmological parameter constraints
0
0 comments X p. Extension

The pith

Full-shape power spectrum and bispectrum data from DESI tighten limits on neutrino mass, dark energy, and spatial curvature beyond baryon acoustic oscillation measurements alone.

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

The paper reanalyzes the public DESI dataset to test extensions to the standard Lambda cold dark matter model. By modeling both the power spectrum and bispectrum of galaxies and quasars within an effective field theory framework, the authors extract additional information that strengthens constraints on massive neutrinos, spatial curvature, and time-varying dark energy. These gains appear whether the full-shape data stand alone or combine with cosmic microwave background measurements. A sympathetic reader would care because sharper bounds on these parameters help determine whether the observed cosmic acceleration requires new physics or fits within known extensions.

Core claim

Incorporating the full-shape likelihood from DESI improves the spatial curvature constraint by a factor of two relative to baryon acoustic oscillation data alone. The dark energy equation-of-state figure of merit rises by roughly 30 percent without supernovae and 20 percent with them. The analysis yields the strongest CMB-independent upper limit on the sum of neutrino masses at 0.32 eV, a 30 percent tightening attributed to the bispectrum, with further 14 to 22 percent improvements when the same likelihood joins CMB data in non-minimal backgrounds.

What carries the argument

The full-shape likelihood built from DESI power spectrum and bispectrum multipoles, modeled inside the effective field theory of large-scale structure.

If this is right

  • The total neutrino mass sum is bounded below 0.32 eV from DESI full-shape data without any cosmic microwave background input.
  • Limits on spatial curvature tighten by a factor of two compared with baryon acoustic oscillation measurements alone.
  • The figure of merit for the two-parameter dark energy equation of state improves by 20 to 30 percent depending on whether supernovae data are included.
  • When the full-shape likelihood joins cosmic microwave background data, neutrino mass bounds strengthen by 14 percent in the minimal extension and up to 22 percent in models that also allow curvature or dynamical dark energy.

Where Pith is reading between the lines

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

  • Tighter neutrino mass limits from large-scale structure could guide the design of next-generation tritium decay or neutrinoless double-beta decay experiments.
  • The same full-shape approach may be applied to forthcoming surveys to test whether dark energy remains consistent with a cosmological constant at higher precision.
  • The reported gains suggest that bispectrum measurements will become standard for breaking parameter degeneracies in extended cosmologies.

Load-bearing premise

The analysis depends on carefully chosen priors for the effective field theory parameters that keep the fits stable when non-minimal cosmological models are explored.

What would settle it

An independent upper limit on the neutrino mass sum below 0.059 eV from a future CMB experiment combined with laboratory data would test whether the reported 14 percent improvement from DESI full-shape data holds.

Figures

Figures reproduced from arXiv: 2511.20757 by Anton Chudaykin, Mikhail M. Ivanov, Oliver H. E. Philcox.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p007_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p011_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p013_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p015_6.png] view at source ↗
read the original abstract

We carry out an independent re-analysis of the Dark Energy Spectroscopic Instrument (DESI) public dataset, focusing on extensions to the standard cosmological model, $\Lambda$CDM. Utilizing the dataset and Effective Field Theory (EFT)-based pipeline described in Paper 1, we constrain cosmological models with massive neutrinos ($\Lambda$CDM+$M_\nu$), spatial curvature ($o\Lambda$CDM), dynamical dark energy ($w_0w_a$CDM), and their combinations using the power spectrum and bispectrum of DESI galaxies and quasars. Our work also presents the first measurements of relevant non-minimal cosmological parameters from the combination of cosmic microwave background (CMB) and DESI full-shape (FS) data, which are made possible thanks to carefully chosen priors on EFT parameters. We find that the addition the FS likelihood to DESI's baryon acoustic oscillation (BAO) data improves the limits on the spatial curvature by a factor of two over the BAO only results, though the improvements are less significant with the CMB data. The dark energy equation of state figure-of-merit increases both with and without the supernovae data (SNe), by $\approx30\%$ and $\approx20\%$ relative to the CMB+BAO and CMB+BAO+SNe results, respectively. Our FS likelihood also yields the strongest CMB-independent constraint on the total neutrino mass $M_\nu<0.32\,{\rm eV}$, with the $30\%$ improvement due to the bispectrum. In combination with the CMB, we find a $14\%$ improvement assuming the $\Lambda$CDM+$M_\nu$ model (yielding $M_\nu<0.059\,{\rm eV}$), but this increases to $22\%$ when using non-minimal backgrounds: $M_\nu<0.097\,{\rm eV}$ in $o\Lambda$CDM+$M_\nu$ and $M_\nu<0.13\,{\rm eV}$ in $w_0w_a$CDM+$M_\nu$. Overall, our work illustrates that robust and substantial gains in constraining power can be obtained by incorporating the FS power spectrum and bispectrum measurements in analyses of non-minimal cosmological models.

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 reanalyzes the DESI DR1 public dataset with an EFT-based pipeline (from Paper 1) that incorporates both the power spectrum and bispectrum of galaxies and quasars. It derives constraints on extensions to ΛCDM including massive neutrinos (ΛCDM+M_ν), spatial curvature (oΛCDM), dynamical dark energy (w0waCDM), and their combinations. Key results include a factor-of-two improvement on curvature from FS+BAO, ~20-30% gains in dark-energy figure-of-merit, the strongest CMB-independent neutrino-mass bound M_ν<0.32 eV (30% tightening attributed to the bispectrum), and first CMB+FS constraints on non-minimal models (M_ν<0.059 eV in ΛCDM+M_ν, tightening to 14-22% with non-minimal backgrounds), all enabled by carefully chosen EFT-parameter priors.

Significance. If the central numerical improvements hold after scrutiny of the prior choices, the work would demonstrate that full-shape DESI data (power spectrum plus bispectrum) meaningfully tightens constraints on neutrino mass and extended dark-energy models beyond BAO-only or CMB+BAO analyses, providing the first combined CMB+FS limits on oΛCDM+M_ν and w0waCDM+M_ν. This would strengthen the case for including higher-order statistics in future cosmological parameter estimation.

major comments (2)
  1. [Abstract / Methods (EFT priors)] Abstract and methods discussion of non-minimal models: the headline claims that first CMB+FS constraints on oΛCDM+M_ν and w0waCDM+M_ν (and the 14-22% M_ν improvements) are “made possible thanks to carefully chosen priors on EFT parameters” require explicit robustness tests. The manuscript must demonstrate that the reported posteriors on M_ν, Ω_k, w0, wa remain stable when the EFT nuisance-parameter prior widths are varied by factors of 2-3; otherwise the gains may be partly prior-driven rather than data-driven.
  2. [Results (neutrino-mass constraints)] Results on neutrino mass (M_ν<0.32 eV CMB-independent and the quoted CMB+FS bounds): the 30% bispectrum-driven improvement and the model-dependent tightening in non-minimal backgrounds rest on the assumption that the chosen EFT priors do not materially shift the cosmological-parameter marginals. A quantitative comparison of posteriors with and without the bispectrum, together with prior-variation tables, is needed to substantiate that the improvement is load-bearing for the central claim.
minor comments (2)
  1. [Methods] Clarify the precise data-vector cuts, scale ranges, and covariance estimation procedure for the bispectrum component of the FS likelihood; these details are essential for reproducibility of the quoted 30% improvement.
  2. [Methods] Add a short table comparing the EFT prior widths adopted here versus those used in the original DESI FS analyses to make the “carefully chosen” statement concrete.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments on our reanalysis of the DESI DR1 dataset. We address each major comment below and will revise the manuscript to incorporate the requested robustness checks and comparisons.

read point-by-point responses

  1. Referee: [Abstract / Methods (EFT priors)] Abstract and methods discussion of non-minimal models: the headline claims that first CMB+FS constraints on oΛCDM+M_ν and w0waCDM+M_ν (and the 14-22% M_ν improvements) are “made possible thanks to carefully chosen priors on EFT parameters” require explicit robustness tests. The manuscript must demonstrate that the reported posteriors on M_ν, Ω_k, w0, wa remain stable when the EFT nuisance-parameter prior widths are varied by factors of 2-3; otherwise the gains may be partly prior-driven rather than data-driven.

    Authors: We agree that explicit tests are required to confirm the stability of the reported constraints. In the revised manuscript we will add a new appendix (or subsection) showing the effect of widening the EFT nuisance-parameter priors by factors of 2 and 3 for the oΛCDM+M_ν and w0waCDM+M_ν models. The posteriors on M_ν, Ω_k, w0 and wa will be shown to shift by amounts well below the quoted improvements, thereby demonstrating that the gains are not primarily prior-driven. revision: yes

  2. Referee: [Results (neutrino-mass constraints)] Results on neutrino mass (M_ν<0.32 eV CMB-independent and the quoted CMB+FS bounds): the 30% bispectrum-driven improvement and the model-dependent tightening in non-minimal backgrounds rest on the assumption that the chosen EFT priors do not materially shift the cosmological-parameter marginals. A quantitative comparison of posteriors with and without the bispectrum, together with prior-variation tables, is needed to substantiate that the improvement is load-bearing for the central claim.

    Authors: We will include in the revised manuscript a direct side-by-side comparison of the one-dimensional and two-dimensional posteriors obtained with the full-shape likelihood versus the power-spectrum-only likelihood. We will also add tables that quantify the change in the M_ν upper limits (both CMB-independent and CMB+FS) when the EFT priors are varied by the requested factors. These additions will make explicit the contribution of the bispectrum to the 30 % improvement and the robustness of the 14–22 % tightenings. revision: yes

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper reports posterior constraints on extensions to ΛCDM (including M_ν, curvature, and w0wa) obtained by applying the EFT-based full-shape likelihood (power spectrum + bispectrum) from Paper 1 to DESI DR1 data, both alone and in combination with CMB. These are standard Bayesian constraints; the quoted improvements (e.g., 30% tightening on M_ν from the bispectrum, factor-of-two on curvature) are differences in posterior widths driven by the added data likelihood, not quantities defined by construction from fitted parameters or self-referential inputs. The explicit statement that non-minimal-model results are 'made possible thanks to carefully chosen priors on EFT parameters' acknowledges a modeling choice for numerical stability but does not reduce the cosmological posteriors to those priors. Self-reference to Paper 1 supplies the pipeline and is not invoked as a uniqueness theorem or load-bearing justification for the new results. No step matches the enumerated circularity patterns.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claims rest on the validity of the EFT description for DESI tracers, the choice of priors for EFT nuisance parameters, and standard assumptions about the background cosmologies being tested.

free parameters (1)
  • EFT nuisance parameters
    Priors are chosen to stabilize fits in non-minimal models; specific values not stated in abstract.
axioms (1)
  • domain assumption Effective Field Theory accurately models galaxy and quasar clustering on the relevant scales
    Invoked to justify the full-shape likelihood pipeline.

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Forward citations

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