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arxiv: 2409.13022 · v2 · pith:O3YX67RT · submitted 2024-09-19 · astro-ph.CO · hep-ph

Updated Cosmological Constraints in Extended Parameter Space with Planck PR4, DESI Baryon Acoustic Oscillations, and Supernovae: Dynamical Dark Energy, Neutrino Masses, Lensing Anomaly, and the Hubble Tension

Shouvik Roy Choudhury , Teppei Okumura This is my paper

Reviewed by Pith T0 review T1 audit T2 compute T3 formal T4 kernel 2026-05-18 16:08 UTCgrok-4.3pith:O3YX67RTrecord.jsonopen to challenge →

classification astro-ph.CO hep-ph
keywords cosmologydark energyneutrino masslensingHubble tensionPlanck dataBAOsupernovae
0
0 comments X

The pith

Planck PR4 CMB data with DESI BAO and supernovae include a cosmological constant within 2 sigma for some samples but show persistent Hubble tension at 3 sigma.

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

This paper examines an extended 12-parameter cosmological model that adds dynamical dark energy, neutrino mass sum, effective number of relativistic species, lensing amplitude, and running of spectral index to the standard Lambda CDM. Using updated Planck PR4 likelihoods along with DESI baryon acoustic oscillations and two different supernova samples, the authors find that evidence for dynamical dark energy is not robust and depends on which supernova catalog is used. The lensing anomaly is alleviated as A_lens equals 1 within 2 sigma, but the Hubble tension remains unresolved at 3.2 to 3.9 sigma. Bounds on neutrino masses are provided with a possible hint of non-zero value in some data combinations.

Core claim

In the extended parameter space, CMB+BAO+SNe data from Planck PR4, DESI, and Pantheon+ include a cosmological constant within 2 sigma, while using DESY5 excludes it at over 2 sigma. With CMB+BAO+SNe, A_lens = 1 is included at 2 sigma, showing no significant lensing anomaly, and the Hubble tension persists at 3.2 to 3.9 sigma. A robust upper bound of sum m_nu less than 0.3 eV at 95% CL is obtained, with some combinations showing 1 sigma detection of non-zero sum.

What carries the argument

The 12-parameter extended cosmological model with parameters for dynamical dark energy (w0, wa), sum of neutrino masses, Neff, A_lens, and alpha_s, constrained using Planck PR4 HiLLiPoP, LoLLiPoP, lensing, low-l TT, DESI DR1 BAO, and Pantheon+ or DESY5 SNe likelihoods.

If this is right

  • The dynamical nature of dark energy is not yet robust as it depends on the supernova sample used.
  • Some data combinations indicate a possible 1 sigma+ detection of non-zero sum of neutrino masses.
  • The Hubble tension is not resolved by these simple extensions and remains at 3.2-3.9 sigma.
  • The S8 tension with DES Year 3 weak lensing is reduced to 1.4 sigma due to additional parameters and PR4 likelihoods.

Where Pith is reading between the lines

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

  • Differences between supernova samples likely point to systematics in DESY5 rather than new physics.
  • Future precise measurements could confirm a non-zero neutrino mass sum.
  • Joint analysis of these data sets assumes no unaccounted calibration offsets between datasets.

Load-bearing premise

The analysis assumes that differences between Pantheon+ and DESY5 supernova samples arise from systematics in DESY5 rather than from new physics.

What would settle it

A future analysis with improved supernova data that reconciles or further diverges the results from Pantheon+ and DESY5 on the dark energy parameters would test the robustness of the conclusions.

read the original abstract

We present updated constraints on cosmological parameters in a 12-parameter model, extending the standard six-parameter $\Lambda$CDM by including dynamical dark energy (DE: $w_0$, $w_a$), the sum of neutrino masses ($\sum m_{\nu}$), the effective number of non-photon radiation species ($N_{\rm eff}$), the lensing amplitude scaling ($A_{\rm lens}$), and the running of the scalar spectral index ($\alpha_s$). For CMB data, we use the Planck PR4 (2020) HiLLiPoP and LoLLiPoP likelihoods, Planck PR4+ACT DR6 lensing, and Planck 2018 low-$l$ TT likelihoods, along with DESI DR1 BAO and Pantheon+ and DESY5 uncalibrated type Ia Supernovae (SNe) likelihoods. Key findings are the following: i) Contrary to DESI results, CMB+BAO+Pantheon+ data include a cosmological constant within $2\sigma$, while CMB+BAO+DESY5 excludes it at over $2\sigma$, indicating the dynamical nature of dark energy is not yet robust. Potential systematics in the DESY5 sample may drive this exclusion. ii) Some data combinations show a $1\sigma$+ detection of non-zero $\sum m_{\nu}$, indicating possible future detection. We also provide a robust upper bound of $\sum m_{\nu} \lesssim 0.3$ eV (95% confidence limit (C.L.)). iii) With CMB+BAO+SNe, $A_{\rm lens} = 1$ is included at $2\sigma$ (albeit not at $1\sigma$), indicating no significant lensing anomaly in this extended cosmology with Planck PR4 likelihoods. iv) The Hubble tension persists at $3.2$ to $3.9\sigma$, suggesting these simple extensions do not resolve it. v) The $S_8$ tension with DES Year 3 weak lensing is reduced to $1.4\sigma$, likely due to additional parameters and the Planck PR4 likelihoods.

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 paper updates constraints on a 12-parameter extended cosmological model (adding w0, wa for dynamical DE, sum m_nu, Neff, A_lens, and alpha_s) using Planck PR4 HiLLiPoP/LoLLiPoP and low-l TT likelihoods, Planck PR4+ACT DR6 lensing, DESI DR1 BAO, and uncalibrated Pantheon+ or DESY5 SNe. It reports that a cosmological constant is consistent within 2σ for CMB+BAO+Pantheon+ but excluded at >2σ for CMB+BAO+DESY5 (suggesting dynamical DE is not robust and may be driven by DESY5 systematics), provides an upper bound sum m_nu ≲ 0.3 eV (95% CL) with some 1σ+ hints for non-zero mass, finds A_lens=1 included at 2σ (no significant lensing anomaly), Hubble tension persisting at 3.2–3.9σ, and S8 tension with DES Y3 reduced to 1.4σ.

Significance. If the results hold, the work provides timely updates on extended cosmologies with newer Planck PR4 and DESI data, quantifying how simple extensions fail to resolve the Hubble tension while reducing the S8 tension and showing sensitivity of dynamical DE claims to SNe sample choice. Explicit tension quantifications and robust neutrino mass bounds are useful for the field.

major comments (2)
  1. [Abstract, points i and v] Abstract point i and v: the interpretation that differences between Pantheon+ and DESY5 drive the dynamical DE exclusion (and allow joint-analysis conclusions on A_lens and Hubble tension to stand) rests on the assumption of no unaccounted calibration offsets or sample-specific biases; this is load-bearing for the headline claims on A_lens=1 at 2σ and Hubble tension at 3.2–3.9σ but lacks explicit tests (e.g., free offset parameters or cross-calibration checks) in the reported fits.
  2. [Abstract, point iii] Abstract point iii: the claim that A_lens=1 is included at 2σ (but not 1σ) with CMB+BAO+SNe does not specify which SNe sample enters the posterior; given the sample dependence shown for w0/wa in point i, this ambiguity affects whether the 'no significant lensing anomaly' conclusion is robust across the data combinations used for the other results.
minor comments (2)
  1. Clarify in the methods or results section the exact data combinations (e.g., which SNe sample) for each quoted sigma tension or bound to remove ambiguity between Pantheon+ and DESY5 results.
  2. The abstract notes 'uncalibrated' SNe likelihoods; add a brief statement on how calibration is handled or why it does not impact the reported posteriors.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful review and constructive comments on our manuscript. We address each major comment below and have revised the text to improve clarity regarding supernova sample dependence while maintaining the integrity of our reported results.

read point-by-point responses

  1. Referee: [Abstract, points i and v] Abstract point i and v: the interpretation that differences between Pantheon+ and DESY5 drive the dynamical DE exclusion (and allow joint-analysis conclusions on A_lens and Hubble tension to stand) rests on the assumption of no unaccounted calibration offsets or sample-specific biases; this is load-bearing for the headline claims on A_lens=1 at 2σ and Hubble tension at 3.2–3.9σ but lacks explicit tests (e.g., free offset parameters or cross-calibration checks) in the reported fits.

    Authors: We appreciate the referee's emphasis on potential calibration offsets between supernova samples. The manuscript already highlights that the difference in dynamical dark energy constraints is likely driven by systematics in the DESY5 sample, as Pantheon+ remains consistent with a cosmological constant. The results for A_lens and the Hubble tension are derived and reported separately for each supernova sample (Pantheon+ and DESY5), with the quoted ranges (3.2–3.9σ for Hubble tension) encompassing both combinations; these conclusions do not rely on a joint Pantheon++DESY5 analysis. While we did not introduce additional free offset parameters (which would further expand the already 12-parameter space and require new MCMC runs), we reference existing cross-calibration studies in the literature. We will add clarifying text in the revised manuscript to explicitly state that the A_lens and Hubble tension results hold independently for each sample, constituting a partial revision. revision: partial

  2. Referee: [Abstract, point iii] Abstract point iii: the claim that A_lens=1 is included at 2σ (but not 1σ) with CMB+BAO+SNe does not specify which SNe sample enters the posterior; given the sample dependence shown for w0/wa in point i, this ambiguity affects whether the 'no significant lensing anomaly' conclusion is robust across the data combinations used for the other results.

    Authors: We agree that the abstract statement for A_lens should be unambiguous. The claim refers to the CMB+BAO combined with either Pantheon+ or DESY5, as both data combinations yield A_lens consistent with unity at the 2σ level (detailed in Section 4 and Table 2 of the manuscript). To eliminate any potential confusion arising from the w0/wa sample dependence, we will revise the abstract to explicitly note the supernova samples used and confirm the robustness of the A_lens result across them. This is a straightforward clarification that does not alter the scientific content. revision: yes

Circularity Check

0 steps flagged

No circularity: constraints are direct outputs of likelihood fits to external data

full rationale

The paper performs standard Bayesian parameter estimation via MCMC on a 12-parameter extended cosmology using independent external likelihoods (Planck PR4 HiLLiPoP/LoLLiPoP, ACT DR6 lensing, DESI DR1 BAO, Pantheon+ and DESY5 SNe). No equations, ansatze, or self-citations reduce any reported 'prediction' or central result to a fitted input by construction. Claims about A_lens inclusion at 2σ, Hubble tension significance, and dynamical DE robustness are direct posterior outputs; interpretations of DESY5 vs. Pantheon+ differences are post-hoc and do not alter the fitting procedure itself. The derivation chain is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

3 free parameters · 2 axioms · 0 invented entities

The central results rest on standard cosmological assumptions plus the choice of which supernova catalog to trust when they disagree. No new particles or forces are postulated.

free parameters (3)
  • w0, wa (dynamical DE parameters)
    Fitted to data in the 12-parameter space; central to the dynamical DE claim.
  • sum m_nu
    Fitted neutrino mass sum; upper bound reported but detection is only 1 sigma in some combinations.
  • A_lens
    Lensing amplitude scaling parameter; fitted and compared to 1.
axioms (2)
  • domain assumption Flat universe and standard recombination history
    Implicit in all LambdaCDM extensions; invoked when combining CMB and BAO likelihoods.
  • ad hoc to paper No unmodeled systematics between Pantheon+ and DESY5 samples
    The paper attributes differing DE conclusions to possible DESY5 systematics without quantifying the offset.

pith-pipeline@v0.9.0 · 5964 in / 1554 out tokens · 44517 ms · 2026-05-18T16:08:10.356264+00:00 · methodology

discussion (0)

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