REVIEW 3 major objections 5 minor 2 cited by
Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI
T0 review · 3 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read Cosmic acceleration can arise from adiabatic particle creation in the dark matter sector, and the fitted creation rates are non-zero at many standard deviations across CC, supernova, and DESI BAO data.
desk verdict A competent background study whose headline claim is not supported by its own results: Model I is LambdaCDM in disguise, Model II is only mildly preferred by a few dataset combos, and no perturbation test is attempted. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing mechanism is the adiabatic creation pressure $p_c = -(\Gamma/3H)\rho_{\rm dm}$, derived from the thermodynamic relation for a fluid whose particle number changes isentropically; it modifies only the dark matter continuity equation while the total stress-energy tensor stays conserved. The two rates studied are $\Gamma = 3\alpha H(\rho_{c,0}/\rho_{\rm dm})$ (Model I) and $\Gamma = 3\alpha H(\rho_{c,0}/\rho_{\rm dm})^l$ (Model II), which admit exact analytic solutions for $\rho_{\rm dm}$ whose constant asymptotic piece acts as an effective cosmological constant. The phase-space analysis in variables $(\Omega_{\rm dm}, \Omega_r, \xi = H_0/(H_0+H))$ shows that the physically accepted branch always flows from a radiation-dominated unstable point through a decelerating matter era to a stable de Sitter-like attractor, while phantom-like branches suffer early acceleration and are discarded.
What would settle it
A concrete test is to compute the linear matter growth predicted by the modified dark-matter continuity equation with the best-fit parameters and compare it against redshift-space distortion measurements such as $f\sigma_8(z)$; if the creation pressure suppresses or enhances structure growth beyond what current clustering data allow, the models would be ruled out despite their good background fit. A full CMB likelihood analysis that includes the effective dark-matter equation of state would settle the question.
Extended reading notes
Core claim
On the paper's own terms, the discovery is that the observed background expansion is consistent with a universe in which dark matter particles are continually created by the gravitational field, and that this creation is what accelerates the expansion at late times. The creation process enters as a creation pressure $p_c = -(\Gamma/3H)\rho_{\rm dm}$ in the dark matter continuity equation $\dot{\rho}_{\rm dm} + 3H\rho_{\rm dm} = \Gamma\rho_{\rm dm}$, which is equivalent to giving dark matter a dynamical equation of state $w_{\rm dm} = -\Gamma/3H$. For Model I this equation solves exactly to $\rho_{\rm dm} = \alpha\rho_{c,0} + (\rho_{{\rm dm},0}-\alpha\rho_{c,0})(1+z)^3$, whose constant piece plays precisely the role of a cosmological constant, so the model reproduces $\Lambda$CDM's expansion history with no vacuum energy at all. Model II generalizes this with an exponent and, fitted to DESI BAO DR2 combined with supernova samples, prefers $l \neq 1$, a genuine departure from $\Lambda$CDM, while still describing the full thermal history from radiation domination through matter-dominated deceleration to a de Sitter-like attractor. The authors conclude that matter creation is an observationally viable alternative to both dark energy and modified gravity at the background level.
Load-bearing premise
The whole analysis lives at the background level: the paper assumes that the same creation process, once perturbations are included, will not alter the growth of cosmic structure in a way that contradicts CMB or galaxy-clustering observations, a check the authors explicitly defer to future work.
Editorial extensions
If this is right
- Late-time cosmic acceleration can be produced without a cosmological constant or modified gravity, purely by a positive particle-creation rate in the dark matter sector.
- Both models require $\alpha \neq 0$ at many standard deviations, so matter creation is strongly favoured over no creation; Model I is statistically equivalent to $\Lambda$CDM while Model II is preferred over $\Lambda$CDM when DESI BAO data are included.
- The preference for $l \neq 1$ in Model II with DESI DR2 data gives a physical interpretation of DESI's dynamical dark energy hint: what looks like evolving dark energy could be an emergent creation pressure.
- Data combinations involving the DESY5 supernova sample push the inferred $H_0$ to about 70 km/s/Mpc, suggesting matter creation could ease the Hubble tension, although only a perturbation-level analysis can confirm this.
- The phase-space analysis shows which branches of Model II are physically viable: only the $\Lambda$CDM-like branch survives, since phantom-like branches suffer unacceptably early acceleration.
Reading between the lines
- The decisive arena for these models is perturbative: the effective dark-matter equation of state $w_{\rm dm} = -\Gamma/3H$ will change the sound speed and growth of dark-matter fluctuations, so CMB lensing, $f\sigma_8$ data, and the matter power spectrum should discriminate matter-creation cosmologies from $\Lambda$CDM even where the background fits are identical.
- The near-degeneracy of Model I with $\Lambda$CDM suggests current background probes are close to their limit for detecting creation; the testable distinction shifts to non-linear structure, gravitational lensing, and the dark-matter halo mass function.
- A model-agnostic check would be to promote $\alpha$ or $l$ to functions of redshift and compare against the DESI $(w_0, w_a)$ contours, which would show whether the creation-pressure interpretation is kinematically distinct from evolving dark-energy parameterizations.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript investigates two adiabatic matter-creation cosmologies as alternatives to dark energy and modified gravity, motivated by the recent DESI DR2 BAO data. Model I uses the Lima-Jesus-Oliveira creation rate Gamma = 3 alpha H (rho_c0/rho_dm), while Model II generalizes it to Gamma = 3 alpha H (rho_c0/rho_dm)^l. The paper derives analytical solutions for the dark-matter density and Hubble rate, performs a dynamical-system analysis for both models (including sub-cases of l), and fits the models to Cosmic Chronometer, Pantheon+, DESY5, Union3, and DESI DR1/DR2 data using MCMC. The authors report evidence for matter creation at many standard deviations in both models, find Model I statistically equivalent to LambdaCDM, and claim that for DESI-including datasets Model II is favored over LambdaCDM. The paper explicitly states that perturbation-level analysis and CMB confrontation are left to future work.
Significance. If the results held, the paper would provide a background-level proof of concept that adiabatic particle creation can mimic LambdaCDM and, for l != 1, produce a dynamical dark-energy-like expansion. The analytical solutions and dynamical-system classification are carried out carefully, and the observational analysis uses standard public likelihoods with transparent MCMC implementation and model-comparison tables. The main significance is limited by two facts: for Model I the Friedmann equation is exactly LambdaCDM with alpha playing the role of Omega_Lambda, so the reported 'evidence of matter creation' is a restatement of evidence for a cosmological-constant-like term; and the physical viability of the models as alternatives to dark energy is not tested at the perturbation level. The paper is honest about this limitation, but the abstract and conclusions currently claim more than the background analysis can support.
major comments (3)
- [III.A, Eq. (34), and V.A] The claim that Model I shows 'evidence of matter creation at many standard deviations' is not supported by the model structure. Substituting the analytical solution (33) into the Friedmann equation yields Eq. (34), which is exactly the LambdaCDM expansion history with alpha playing the role of Omega_Lambda. Consequently, the posteriors in Table IV measure a cosmological-constant-like energy density, not a particle-creation mechanism; the same applies to Model II at l = 1 and, via Omega_eff^Lambda approximately alpha^(1/l) in Eq. (40), approximately for general l. The abstract should be rewritten to avoid implying that a detection of alpha != 0 constitutes evidence for the creation process itself.
- [VI, Eqs. (21)-(24)] The viability of the models as alternatives to dark energy is not established without a perturbation analysis. The creation pressure p_c = -Gamma rho_dm/(3H) enters the second Friedmann equation, and the modified dark-matter continuity equation (21) changes the perturbed conservation laws; linearizing the rates in Eqs. (32) and (37) introduces delta-Gamma contributions that can modify the growth of structure, possibly in a scale-dependent way, and can produce instabilities or altered f sigma_8 values. Since the paper explicitly defers this analysis ('one should extend the analysis beyond the background level...'), the headline claim that matter creation is a viable alternative to dark energy is currently a background degeneracy statement. I request either a quantitative perturbation analysis (e.g., growth index, f sigma_8, CMB TT/TE/EE, lensing) or a substantial toning-down of the physical-viability claims.
- [Abstract and V.B / Table VII] The abstract's statement that 'when DESI data are included matter creation Model II is favoured over LambdaCDM' is stronger than the results. In Table VII only three of the nine dataset combinations satisfy Delta chi^2_min > 3.84, and only CC+U3+D-DR2 has a positive Delta BIC, with Delta BIC = 0.28, which is weak evidence. The body correctly describes the outcome as 'a mixed picture.' The abstract and the concluding paragraph should be revised to reflect that Model II is preferred only in some DESI-including combinations and only by LRT/AIC, not by BIC for most combinations.
minor comments (5)
- [III.B, Table II] The entries for the 0<l<1 case contain two points labeled B1, and the text refers to both as 'B1'; renumber the second as B2 and adjust the discussion accordingly.
- [IV.3] The DESI DR2 description says 13 data points from 7 redshift bins, but the text earlier mentions 7 redshift bins with D_M/r_d, D_H/r_d, and D_V/r_d; clarify the exact counting.
- [V.B] The likelihood-ratio-test threshold reference [152,153] is nonstandard; cite a standard statistics reference for the chi-square threshold.
- [Tables IV-VII] The notation 'D-DR1' and 'D-DR2' is confusing; use 'DESI-DR1' and 'DESI-DR2' consistently.
- [IV, priors] The MCMC prior l ~ U(-1,1.2) includes the l<0 region that Section III.B.3 identifies as 'not physically interesting' because of early acceleration; if these regions are excluded on physical grounds, the prior should be truncated to l>0 to avoid mixing theoretically disfavored solutions with the fitted posterior.
Circularity Check
The 'evidence of matter creation' is the ΛCDM constant term relabeled: for Model I the fitted α is exactly Ω_Λ by Eq. (34), so the headline detection is a relabeling, not an independent result.
-
renaming known result
[Section V.A (parameter interpretation) and Section III.A, Eq. (34)]
"Recall that for both the models, α̸= 0 indicates the evidence of matter creation ... The first Friedmann equation (23) can be written as (H/H0)^2 = α+(Ω_dm,0−α)(1+z)^3+Ω_b,0(1+z)^3+Ω_r,0(1+z)^4."
Model I's rate (32), Γ=3αHρ_c0/ρ_dm, converts the DM continuity equation into dρ_dm/dt+3Hρ_dm=3αHρ_c0, whose solution (33) is ρ_dm=(ρ_dm,0−αρ_c0)a^−3+αρ_c0. Substituting into the Friedmann equation gives Eq. (34), which is exactly ΛCDM with α playing the role of Ω_Λ. The parameter α fitted to CC, SNIa, and DESI-BAO data is therefore not an independent 'matter creation' amplitude; it is the same constant energy-density term already present in ΛCDM. The abstract's claim 'we find evidence of matter creation at many standard deviations' is logically the same statement as 'the data prefer a non-zero cosmological constant,' merely relabeled as a creation-rate parameter.
full rationale
The paper's thermodynamic setup, continuity equations, and dynamical-system analysis are internally self-contained, and the model is not derived from a self-citation chain: the core creation-rate ansätze trace to external work by Lima et al., and the authors' self-citations appear mainly as methodological references (e.g., [117,118]) or related-model studies, none of which is load-bearing for the central claim. The main circular element is at the interpretation level: because Model I's expansion history is mathematically identical to ΛCDM with α=Ω_Λ, the fitted 'evidence of matter creation' is the known cosmological-constant evidence under a new parameter name. The paper itself acknowledges this mimicry ('the above solution naturally generates a constant term which resembles a cosmological constant term') and that Model I is statistically equivalent to ΛCDM, but the abstract nevertheless presents the non-zero α of both models as evidence for matter creation. This is a partial circularity: a fitted parameter that is, by construction, the ΛCDM constant-density parameter is relabeled as a detection of a new physical mechanism. The acknowledged absence of a perturbation analysis (Section VI) is a completeness and viability gap rather than a circularity, and it does not further increase the circularity score.
Assumptions & free parameters
free parameters (4)
- alpha (creation rate amplitude) =
0.65-0.72 depending on dataset (e.g., 0.670 +/- 0.018 for CC+PP in Model I)
- l (power-law exponent) =
0.65-0.89 depending on dataset (e.g., 0.830 +0.220/-0.170 for CC+PP in Model II)
- H0 =
~67.7-70.5 km/s/Mpc
- M (SNIa absolute magnitude) =
23.78-23.81
assumptions (7)
- standard math FLRW metric and general relativity with minimal matter coupling
- domain assumption Creation pressure ansatz p_c = -(Gamma/(3H))(rho_dm+p_dm) and adiabaticity (alpha=1 in Eq. 13)
- ad hoc to paper Specific creation rate choices Gamma=3*alpha*H*(rho_c0/rho_dm) and Gamma=3*alpha*H*(rho_c0/rho_dm)^l
- domain assumption Radiation and baryons follow standard conservation laws with no interaction with dark matter
- domain assumption Dark matter equilibrium pressure is zero
- standard math The physical domain 0 <= x <= 1, 0 <= y <= 1, 0 <= xi <= 1, x+y <= 1 and positive invariance
- ad hoc to paper Perturbations around the background are not treated and are assumed not to invalidate the model
Cite this review
Pith. "Pith review of Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI." pith.science (2026). https://pith.science/paper/EBG7UEDU
@misc{pith2026250715575,
author = {Pith},
title = {Pith review of: Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI},
year = {2026},
howpublished = {\url{https://pith.science/paper/EBG7UEDU}},
note = {Machine review of arXiv:2507.15575}
}
abstract
We investigate the background cosmological expansion on the onset of cosmological homogeneous matter creation scenario, a dynamical dark matter approach ($w_{\rm dm} \neq 0$), and an alternative approach to both dark energy and modified gravity theories, after the recent DESI DR2-BAO release. We consider that the total matter sector consists of three independently evolving components, namely, radiation, baryons, and dark matter, with the latter being governed by an adiabatic matter creation process, affects the background homogeneously, leads to a modified continuity equation. Though the total stress-energy tensor is conserved the only violation of the conservation law in the dark matter sector is coming from the creation pressure, and under a proper choice of dark-matter particle creation rate one can obtain the present accelerating phase as well as the past thermal history of the Universe. We study two specific matter creation rates. By applying the dynamical-system analysis we show that both Model I and Model II can mimic a $\Lambda$CDM-like behavior. Furthermore, we perform a detailed observational confrontation using a series of latest observational datasets including Cosmic Chronometers (CC), Supernovae Type Ia (SNIa) (Pantheon+, DESY5 and Union3 samples) and DESI Baryon Acoustic Oscillations (BAO) (DR1 and DR2 samples). In both Model I and Model II we find evidence of matter creation at many standard deviations. Finally, applying the AIC and BIC information criteria we find that Model I is statistically equivalent with $\Lambda$CDM scenario, while Model II shows a mixed picture, namely for most datasets $\Lambda$CDM scenario is favoured, however when DESI data are included matter creation Model II is favoured over $\Lambda$CDM paradigm.
Figures
Figures from the paper (7 more)
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Reference graph
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[1]
Case0< l <1 In this parametric domain the system (41) possesses only one singularity atξ= 1. Multiplying with (1−ξ) 2l yields the autonomous system x′ =xy(1−ξ) 2l + 3αx1−l(1−x)ξ 2l,(43a) y′ =y (y−1)(1−ξ) 2l −3αx 1−lξ2l ,(43b) ξ′ = 3 2 ξ(1−ξ) h 1 + y 3 (1−ξ) 2l −αx 1−lξ2l i .(43c) From the above dynamical system we acquire the follow- ing invariant manifol...
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In contrast to the previous case,x= 0 does not form an invariant manifold
Casel >1 In this case the system (41) simplifies as x′ =xly(1−ξ) 2l + 3α(1−x)ξ 2l,(44a) y′ =y xl−1(y−1)(1−ξ) 2l −3αξ 2l ,(44b) ξ′ = 3 2 ξ(1−ξ) h xl−1 1 + y 3 (1−ξ) 2l −αξ 2l i .(44c) The planesy= 0,ξ= 0,ξ= 1 andx+y= 1 constitute the invariant manifolds in the phase space. In contrast to the previous case,x= 0 does not form an invariant manifold. However, ...
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The criti- cal points and their properties are presented in Table II
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Triangle
Casel= 0 In the casel= 0 the autonomous system simplifies significantly, since Γ = 3αH, namely it becomes x′ =xy+ 3αx(1−x),(46a) y′ =y(y−1−3αx),(46b) ξ′ = 3 2 ξ(1−ξ) 1 + y 3 −αx .(46c) The reduced system possesses five invariant manifolds, namelyx= 0,y= 0,ξ= 0,ξ= 1 andx+y= 1, ensuring that the phase space domainRagain remains positively invariant. In Tabl...
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