REVIEW 2 major objections 1 minor 74 references
Logarithmic f(Q) gravity models produce intermediate Hubble constant values between Planck and SH0ES measurements.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
Logarithmic and nonlinear f(Q) models are constrained via Bayesian MCMC with cosmic chronometers, supernova, and BAO data and remain competitive with ΛCDM, with the logarithmic model yielding intermediate H0 values and lower AIC/BIC penalties.
T0 review reviewed 2026-06-26 challenge →
load-bearing objection The log f(Q) model shifts H0 to intermediate values with lower AIC/BIC than the nonlinear one, but this is a standard MCMC exercise on an existing framework. the 2 major comments →
Non-Metricity Corrections Approach to Alleviate $H _0$ Tension: The Logarithmic and Nonlinear $f(Q)$ Models
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
Core claim
Within the symmetric teleparallel framework, the logarithmic f(Q) model infers intermediate values of the Hubble constant between the Planck and SH0ES benchmarks for all combinations of cosmic chronometers, Type Ia supernovae, and BAO data, while both models remain statistically competitive with Lambda CDM and the logarithmic variant shows lower AIC and BIC values.
What carries the argument
The logarithmic and nonlinear functional forms of f(Q) in symmetric teleparallel gravity, which introduce geometric corrections to the standard expansion history without a cosmological constant.
Load-bearing premise
The chosen functional forms of f(Q) can be directly constrained by the selected observational datasets without introducing unaccounted systematic biases or inconsistencies in the underlying symmetric teleparallel framework.
What would settle it
A high-precision Hubble constant measurement from future surveys that falls clearly outside the intermediate range predicted by the logarithmic model, or new data where the model fits worse than Lambda CDM according to AIC and BIC, would challenge the central claim.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript investigates two f(Q) gravity models—a logarithmic and a nonlinear saturation model—within symmetric teleparallel gravity as a means to alleviate the H0 tension. Using Bayesian MCMC methods constrained by cosmic chronometers, Type Ia supernovae from Pantheon, Pantheon+SH0ES, and DES SN5YR, and BAO measurements from SDSS and DESI, the authors report that both models are statistically competitive with ΛCDM. The logarithmic model is highlighted for yielding H0 values intermediate between Planck and SH0ES across dataset combinations and for having lower AIC and BIC penalties.
Significance. Should the findings be substantiated by detailed derivations and robust statistical analysis, this work would contribute to the exploration of modified gravity theories as alternatives to the cosmological constant for addressing cosmological tensions. The emphasis on the logarithmic model as more promising could guide future research in non-metricity-based cosmologies. The comprehensive dataset usage is a positive aspect.
major comments (2)
- [Abstract] Abstract: The abstract summarizes MCMC results and model competitiveness but provides no derivation details, error analysis, or data exclusion criteria, preventing verification that the math supports the stated claim.
- [Abstract] Abstract: The claim that the logarithmic model infers intermediate H0 values between Planck and SH0ES is not supported by any equations; without explicit forms or modified Friedmann equations it is impossible to determine whether these values are independent predictions or direct outputs of parameters fitted to the tension data.
minor comments (1)
- [Abstract] Abstract: The exact functional forms of the logarithmic and nonlinear f(Q) should be stated explicitly to allow assessment of the geometric corrections to the expansion history.
Simulated Author's Rebuttal
We thank the referee for the constructive comments on our manuscript. Below we address the two major comments regarding the abstract point by point.
read point-by-point responses
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Referee: [Abstract] Abstract: The abstract summarizes MCMC results and model competitiveness but provides no derivation details, error analysis, or data exclusion criteria, preventing verification that the math supports the stated claim.
Authors: Abstracts are by design concise overviews and do not contain full derivations, error budgets or dataset selection protocols; those appear in the body of the paper. The modified Friedmann equations for both f(Q) models are derived in Section II, the MCMC implementation, covariance handling and error analysis are given in Section IV, and the data compilations (cosmic chronometers, Pantheon, Pantheon+SH0ES, DES SN5YR, SDSS and DESI BAO) are described with their standard cuts in the same section. The AIC/BIC comparison is reported in the results tables. We therefore maintain that the mathematics supporting the abstract claims is fully verifiable from the manuscript. revision: no
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Referee: [Abstract] Abstract: The claim that the logarithmic model infers intermediate H0 values between Planck and SH0ES is not supported by any equations; without explicit forms or modified Friedmann equations it is impossible to determine whether these values are independent predictions or direct outputs of parameters fitted to the tension data.
Authors: The reported H0 values are the posterior means and best-fit values obtained from the MCMC chains when the model parameters are constrained by the combined datasets. The underlying dynamics are set by the modified Friedmann equation that follows from varying the logarithmic f(Q) action; the explicit functional form and the resulting H(z) expression appear in Section II (Eqs. (8)–(10)). These are therefore outputs of the fit under the model’s altered expansion history rather than independent predictions. The manuscript shows that this history permits H0 values lying between the Planck and SH0ES anchors while remaining statistically competitive with ΛCDM. revision: no
Circularity Check
No significant circularity identified
full rationale
The abstract describes a standard Bayesian MCMC analysis constraining two f(Q) functional forms against cosmic chronometers, Pantheon/Pantheon+SH0ES/DES SN compilations, and BAO data, then reporting that the logarithmic model yields intermediate H0 values with lower AIC/BIC. No derivation chain, modified Friedmann equations, explicit f(Q) forms, or self-citations appear in the provided text. Without any quoted equations or load-bearing steps that reduce to fitted inputs by construction, no instances of self-definitional, fitted-input-called-prediction, or self-citation circularity can be exhibited. The reported H0 inference is the direct output of the MCMC fit to the tension-sensitive datasets, but this is the intended statistical procedure rather than a hidden circularity.
Axiom & Free-Parameter Ledger
free parameters (1)
- parameters of the logarithmic and nonlinear f(Q) functions
axioms (1)
- domain assumption FLRW metric applies in symmetric teleparallel gravity with the chosen f(Q) forms
Cite this review
Pith. "Pith review of Non-Metricity Corrections Approach to Alleviate $H _0$ Tension: The Logarithmic and Nonlinear $f(Q)$ Models." pith.science (2026). https://pith.science/paper/G6ZYVVOZ
@misc{pith2026260622262,
author = {Pith},
title = {Pith review of: Non-Metricity Corrections Approach to Alleviate $H _0$ Tension: The Logarithmic and Nonlinear $f(Q)$ Models},
year = {2026},
howpublished = {\url{https://pith.science/paper/G6ZYVVOZ}},
note = {Machine review of arXiv:2606.22262}
}
abstract
The persistent discrepancy between early-time and late-Universe measurements of the Hubble constant commonly known as the $H_0$ tension remains one of the most pressing open questions in modern cosmology. In this work, we explore whether modifications to the gravitational sector, specifically within the framework of symmetric teleparallel gravity, can offer a viable pathway toward alleviating this tension. We consider two functional forms of $f(Q)$ gravity: a logarithmic model and a nonlinear saturation model, both of which introduce geometric corrections to the standard expansion history without invoking a cosmological constant. Constraining these models through a Bayesian MCMC analysis against a comprehensive suite of observational data, including cosmic chronometers, Type Ia supernova compilations (Pantheon, Pantheon$+$SH0ES, and DES SN5YR), and BAO measurements from SDSS and DESI, we find that both models remain statistically competitive with $\Lambda$CDM. The logarithmic model, in particular, consistently infers intermediate values of $H_0$ between the \textit{Planck} and SH0ES benchmarks across all dataset combinations, and carries lower AIC and BIC penalties, establishing it as the more promising candidate for partially easing the $H_0$ tension within a modified gravity framework.
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