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arxiv: 2607.06436 · v1 · pith:E5GGFZYN · submitted 2026-07-07 · gr-qc

Observationally Constrained Cosmological model in f(Q,mathcal{L}_(m)) Gravity with H(z) parameterization

Vinod Kumar Bhardwaj , Maxim Khlopov , Maxim Krasnov , Saibal Ray This is my paper

Reviewed by Pith2026-07-08 05:43 UTCglm-5.2pith:E5GGFZYNopen to challenge →

classification gr-qc PACS 98.80.Es04.50.Kd95.36.+x
keywords energymodelconditionconstrainedcosmiccosmologicalmathcalparameter
0
0 comments X

The pith

Non-metricity gravity with imposed H(z) fits cosmic acceleration data

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

The paper asks whether a modified theory of gravity built on non-metricity (the Q scalar) rather than curvature can reproduce the observed history of cosmic expansion without invoking a cosmological constant. The authors adopt a specific three-parameter functional form for the Hubble parameter H(z) — one designed to transition smoothly from early deceleration to late-time acceleration — and plug it into the Friedmann equations of f(Q, L_m) gravity, a framework where the gravitational action couples the non-metricity scalar Q directly to the matter Lagrangian density L_m. They then fit the free parameters against five modern observational datasets (cosmic chronometers, Pantheon+SH0ES supernovae, Union 3.0 supernovae, DESI baryon acoustic oscillation measurements, and CMB distance priors) using standard chi-squared minimization with MCMC sampling. The central claim is that this parameterization, when embedded in the f(Q, L_m) framework with a linear-plus-constant functional form f = -alpha*Q + 2*L_m + beta, produces a cosmological model consistent with current observations across multiple diagnostics: a transition from deceleration to acceleration at redshift z_t approximately 0.643, a present-day equation-of-state parameter in the quintessence regime (between -1 and 0) that asymptotically approaches the LambdaCDM limit, a cosmic age of about 13.724 billion years, and energy conditions satisfying the Null and Dominant conditions while violating the Strong Energy Condition as required for accelerated expansion.

Core claim

The paper's central result is that a cosmological model constructed within f(Q, L_m) gravity — where gravity is described entirely by non-metricity rather than curvature or torsion, and where the matter Lagrangian is non-minimally coupled to the gravitational sector — can be made observationally viable by choosing a particular Hubble parameter parameterization H(z) = H_0 * [(delta + gamma*(z+1)^eta) / (gamma + delta)]^(3/(2*eta)). With best-fit parameters constrained by combined observational data, this setup reproduces the standard cosmological narrative: early matter-dominated deceleration, a transition to dark-energy-driven acceleration at z_t ~ 0.643, a quintessence-like equation ofstate

What carries the argument

The mechanism carrying the argument is the interplay between three components: (1) the f(Q, L_m) gravitational action with the specific linear form f = -alpha*Q + 2*L_m + beta, which modifies the standard Friedmann equations by coupling the non-metricity scalar Q to the matter Lagrangian L_m and introduces non-conservation of the energy-momentum tensor; (2) the imposed Hubble parameterization H(z) = H_0 * [(delta + gamma*(z+1)^eta)/(gamma + delta)]^(3/(2*eta)), which encodes the transition from deceleration to acceleration through its functional shape; and (3) the effective energy density and pressure reconstructed from the modified Friedmann equations, which yield the equation-of-state, dec

If this is right

  • If the model is correct, non-metricity-based gravity theories with matter-geometry coupling provide a viable alternative to the cosmological constant, potentially addressing the fine-tuning and coincidence problems of LambdaCDM.
  • The transition redshift z_t ~ 0.643 and cosmic age ~13.724 Gyr are specific, falsifiable numbers that can be tested against future precision measurements from next-generation surveys.
  • The asymptotic approach of the equation-of-state parameter to the LambdaCDM limit (omega -> -1) means the model becomes degenerate with standard cosmology at late times, making it difficult to distinguish from LambdaCDM using low-redshift probes alone.
  • The violation of the Strong Energy Condition, combined with satisfaction of the Null and Dominant Energy Conditions, places the model in the same qualitative class as standard dark energy scenarios, meaning it does not require exotic phantom matter (omega < -1).

Load-bearing premise

The Hubble parameter parameterization is chosen by hand to produce a transition from deceleration to acceleration, rather than being derived from the f(Q, L_m) action or any underlying physical principle. All subsequent predictions — the transition redshift, cosmic age, equation-of-state trajectory, and energy condition behavior — follow algebraically from this imposed functional form with fitted parameters, so the paper tests whether this parameterization can fit data, not

What would settle it

If future observations (e.g., from DESI DR2 or next-generation CMB experiments) constrain the transition redshift, equation-of-state evolution, or jerk parameter away from the values predicted by this parameterization with its best-fit parameters, the model would be ruled out. Additionally, if the non-conservation of the energy-momentum tensor inherent in f(Q, L_m) gravity produces observable effects in structure formation or gravitational lensing that are not seen, the framework itself would be challenged.

read the original abstract

In the present work, we explore an observationally constrained cosmological model in the framework of $f(Q,\mathcal{L}_{m})$ gravity, where $Q$ denotes the non-metricity scalar and $\mathcal{L}_{m}$ represents the matter Lagrangian density. To derive the modified Friedmann field equations, we consider a flat FLRW space-time. We have considered a specific parameterization of the Hubble parameter $H(z)$ to explore the cosmic evolution, which successfully describes the shift of the cosmos from its initial decelerated expansion period to the current accelerated scenario. The free model parameters are constrained using recent observational datasets including Cosmic Chronometers (CC), Pantheon+SH0ES, Union 3.0, DESI-BAO, and CMB distance priors using MCMC approach through the $\chi^2$-minimization process. The derived results indicate that the present model remains consistent with recent cosmological observations. We note that the deceleration parameter exhibits a signature flipping behavior at transition redshift $z_t \approx 0.643$, confirming the transition from matter-dominated deceleration to dark-energy-driven acceleration. The equation of state (EOS) parameter remains in the quintessence region and exhibits an asymptotical approach to the $\Lambda$CDM limit at late times. Moreover, the estimated cosmic age can be found as $13.724^{+0.087}_{-0.048}$ Gyr, which agrees well with recent observational estimations. The statefinder and Om diagnostics support the quintessence nature of the model. At the same time, the examination of energy conditions reveals that two specific energy conditions, viz. Null Energy Condition (NEC) and Dominant Energy Condition (DEC) are fulfilled, while the Strong Energy Condition (SEC) is violated, validating the accelerated expansion of the universe.

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

1 major / 5 minor

Summary. The manuscript proposes a cosmological model in f(Q, L_m) gravity using the linear form f(Q, L_m) = -alpha*Q + 2*L_m + beta (Eq. 24) on a flat FLRW background. The authors impose a specific H(z) parameterization (Eq. 27) with four free parameters (delta, gamma, eta, H_0), constrain these using CC, Pantheon+SH0ES, Union 3.0, DESI-BAO, and CMB distance priors via MCMC, and then analyze kinematic quantities (deceleration parameter, jerk, statefinders, Om diagnostic) and dynamical quantities (energy density, EOS parameter, energy conditions). The paper reports a transition redshift z_t ~ 0.643, cosmic age ~ 13.724 Gyr, quintessence-like EOS, and satisfaction of NEC/DEC with violation of SEC.

Significance. The paper performs a thorough observational analysis using multiple up-to-date datasets (including DESI DR2 and Union 3.0) and a standard MCMC methodology. The kinematic diagnostics (q, j, r, s, Om) are derived cleanly and are self-consistent. However, the significance of the f(Q, L_m) framework itself is unclear because the theory parameters alpha and beta that define the modification to GR are never constrained or even assigned numerical values, making the dynamical results (EOS, energy conditions) non-reproducible. The H(z) parameterization is imposed rather than derived from the field equations, which is a common approach but limits what the model actually predicts versus what is built in by construction.

major comments (1)
  1. Section 2.2, Eqs. (24)-(26) and Section 4, Eqs. (33)-(35): The theory parameters alpha and beta appear in the Friedmann equations (Eqs. 25-26), the expressions for energy density (Eq. 33), pressure (Eq. 34), and the EOS parameter (Eq. 35). However, Table 1 only reports constraints on delta, gamma, eta, and H_0. The parameters alpha and beta are never assigned numerical values or included in the MCMC fit. Consequently, every dynamical result that depends on rho, p, or omega — including the EOS trajectory (Fig. 2b, Table 2 values of omega_0), the energy density plot (Fig. 2a), and the entire energy conditions analysis (Figs. 7-8, Section 5) — cannot be reproduced from the information provided. The authors must either (i) specify the values of alpha and beta used to generate these figures and justify them, or (ii) include alpha and beta in the MCMC analysis. Without this, the claims about '
minor comments (5)
  1. Eq. (25): The Friedmann equation is written as 3H^2 = rho/(2*alpha) - beta/(2*alpha), which would give rho = 6*alpha*H^2 + beta. However, Eq. (33) gives rho = beta/2 + 3*alpha*H_0^2*[...]^(3/eta) = beta/2 + 3*alpha*H^2, which is consistent with 3H^2 = rho/alpha - beta/(2*alpha). Please check for a factor-of-2 typo in Eq. (25).
  2. Table 2: The omega_0 values for datasets I and II are reported as positive (0.630 and 0.790), which would place the present universe in the matter-dominated or stiff-matter regime, contradicting the claim of quintessence behavior (-1 < omega < 0). Please clarify whether these are typographical errors.
  3. Section 4.4: The statefinder trajectory is described as originating at the SCDM point (r=1, s=1), but the standard SCDM fixed point in the r-s plane is (r=1, s=0). Please verify.
  4. The paper would benefit from a brief discussion acknowledging that the H(z) parameterization is an ansatz imposed on the model rather than a prediction derived from the f(Q, L_m) action, and clarifying what the f(Q, L_m) framework adds beyond the kinematic parameterization.
  5. Several references appear to have formatting issues (e.g., Ref. 62 has a missing title; Ref. 109 has a stray 'd' before 'S.D. Odintsov').

Simulated Author's Rebuttal

1 responses · 0 unresolved

The referee raises a substantive and valid concern: the theory parameters alpha and beta in the f(Q, L_m) model are never assigned numerical values or included in the MCMC fit, making the dynamical results (EOS, energy density, energy conditions) non-reproducible. We acknowledge this is a genuine gap in the manuscript. Upon examination, we find that alpha and beta enter the expressions for rho, p, and omega as overall scaling factors, and the qualitative behavior (sign of energy density, quintessence regime, SEC violation) is independent of their specific values as long as alpha > 0 and beta > 0. However, the referee is correct that without specifying these values, the figures and numerical results cannot be reproduced. We will revise the manuscript to fix alpha = 1 and beta = 0 (recovering the standard GR-like normalization) or to determine beta from the Friedmann equation at z = 0 using the observed matter density, and we will explicitly state the values used. We disagree only with the implication that the entire framework is vacuous: the kinematic results (q, j, r, s, Om) are fully determined by the H(z) parameterization and are independent of alpha and beta, and the qualitative conclusions about energy conditions hold for any positive alpha and beta. Nevertheless, we agree that numerical reproducibility requires specifying these parameters, and we will revise accordingly.

read point-by-point responses

  1. Referee: Section 2.2, Eqs. (24)-(26) and Section 4, Eqs. (33)-(35): The theory parameters alpha and beta appear in the Friedmann equations (Eqs. 25-26), the expressions for energy density (Eq. 33), pressure (Eq. 34), and the EOS parameter (Eq. 35). However, Table 1 only reports constraints on delta, gamma, eta, and H_0. The parameters alpha and beta are never assigned numerical values or included in the MCMC fit. Consequently, every dynamical result that depends on rho, p, or omega — including the EOS trajectory (Fig. 2b, Table 2 values of omega_0), the energy density plot (Fig. 2a), and the entire energy conditions analysis (Figs. 7-8, Section 5) — cannot be reproduced from the information provided. The authors must either (i) specify the values of alpha and beta used to generate these figures and justify them, or (ii) include alpha and beta in the MCMC analysis.

    Authors: The referee is correct that alpha and beta are not assigned numerical values in the current manuscript, and we acknowledge that this prevents reproducibility of the dynamical figures and numerical results. This is a genuine oversight that we will rectify in the revised manuscript. We will adopt option (i): we will specify the values of alpha and beta used and justify them. Specifically, we note that the manuscript already states (Section 2.2) that for alpha = 1 and beta = 0, the standard Friedmann equations of GR are recovered. We will set alpha = 1 as a normalization convention (which simply fixes the effective gravitational coupling) and determine beta from the Friedmann equation (Eq. 25) evaluated at z = 0, using the observed present-day matter density. This yields beta = rho_m0 - 6H_0^2 (in the units of the manuscript), which is fully determined once H_0 is constrained by the MCMC and rho_m0 is fixed from observations. With these values explicitly stated, all dynamical quantities become reproducible. We agree that including alpha and beta as free parameters in the MCMC (option ii) would be a more complete treatment, but it would also introduce degeneracies with the H(z) parameterization parameters that may not be well-constrained by the current datasets. We believe option (i) is the more transparent and practical approach, and we will implement it with full justification in the revision. We also note that the kinematic diagnostics (q, j, r, s, Om) are entirely independent of alpha and beta, as the referee can verify from Eqs. (39)-(44), so those results stand without modification. revision: yes

Circularity Check

0 steps flagged

No significant circularity found; derivation is self-contained parametric cosmology with minor self-citations that are not load-bearing

full rationale

The paper's derivation chain is: (1) choose a linear f(Q, L_m) = -αQ + 2L_m + β action (Eq. 24), yielding Friedmann equations with constants α, β (Eqs. 25–26); (2) impose an ad hoc H(z) parameterization (Eq. 27) with parameters δ, γ, η, H₀; (3) fit those parameters to observational data via MCMC (Table 1); (4) compute derived quantities algebraically. The kinematic quantities (q in Eq. 39, jerk in Eq. 43, statefinders in Eqs. 40–41, Om in Eq. 44) are algebraic consequences of the fitted H(z), and the transition redshift z_t is found by setting q=0. This is standard parametric cosmology: the fitted quantities are H(z) values at various redshifts, while the derived quantities (z_t, age, q₀, j₀) are different quantities computed from the fitted parameters. No prediction is identical to a fitted input by construction. The H(z) parameterization is ad hoc (not derived from the f(Q, L_m) action), but the paper does not claim otherwise — it explicitly states 'we consider a specific parameterization.' The unspecified α and β parameters (never fitted or assigned values) mean the dynamical quantities (ρ, p, ω, energy conditions) are not fully reproducible, but this is a correctness/completeness gap, not circularity. Self-citations exist (refs [51], [86], [87], [101], [103], [111] by Bhardwaj and/or Ray) but are used for result comparison, not as load-bearing theoretical premises. The key theoretical references ([65] for the action form, [107] for energy conditions) are by external author groups. Score 1 reflects the minor, non-load-bearing self-citations.

Axiom & Free-Parameter Ledger

6 free parameters · 4 axioms · 0 invented entities

The model introduces no new particles, forces, fields, or dimensions beyond the f(Q, L_m) framework itself (which is cited from prior work). The free parameters δ, γ, η are mathematical parameters of the H(z) ansatz, not physical entities. The constants α and β appear in the gravitational action but their status (fitted vs fixed) is ambiguous in the paper.

free parameters (6)
  • H_0 = 67.134 ± 1.124 km/s/Mpc (combined IX)
    Present-day Hubble parameter, fitted to observational data via MCMC.
  • δ = 2.200 ± 0.881 (combined IX)
    Parameter in the H(z) parameterization (Eq. 27), fitted to data.
  • γ = 1.346 ± 0.534 (combined IX)
    Parameter in the H(z) parameterization (Eq. 27), fitted to data.
  • η = 2.383 ± 0.146 (combined IX)
    Exponent parameter in the H(z) parameterization (Eq. 27), fitted to data.
  • α = Not explicitly fitted; set to 1 to recover GR limit or treated as fixed
    Appears in f = -αQ + 2L_m + β (Eq. 24). The paper states α=1, β=0 recovers GR but does not clearly report fitted values for α and β in Table 1, suggesting they may be fixed or absorbed.
  • β = Not explicitly reported in Table 1
    Constant term in f = -αQ + 2L_m + β (Eq. 24). Its fitted value is not listed among the constrained parameters in Table 1, creating ambiguity about whether it is fixed or fitted.
axioms (4)
  • domain assumption Flat FLRW metric describes the universe (Eq. 15)
    Standard cosmological assumption; spatial flatness is supported by CMB observations but is still an assumption simplifying the field equations.
  • domain assumption Matter Lagrangian L_m = ρ (matter density)
    Stated in §2.2 when specifying f = -αQ + 2L_m + β. The choice L_m = ρ vs L_m = p or L_m = -ρ affects the field equations; this choice is made without detailed justification.
  • ad hoc to paper The H(z) parameterization H(z) = H_0[(δ+γ(z+1)^η)/(γ+δ)]^(3/2η) adequately describes cosmic expansion history
    This functional form (Eq. 27) is imposed to parameterize H(z). It is not derived from the f(Q, L_m) action or any symmetry principle. Its choice is motivated by the desire to produce a deceleration-to-acceleration transition.
  • ad hoc to paper The linear form f(Q, L_m) = -αQ + 2L_m + β captures the relevant physics
    Eq. 24 selects a specific linear combination of Q and L_m. No derivation or physical argument is given for why this linear form is preferred over other possible f(Q, L_m) functions.

pith-pipeline@v1.1.0-glm · 22158 in / 3402 out tokens · 446457 ms · 2026-07-08T05:43:17.861407+00:00 · methodology

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