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arxiv: 2601.14222 · v2 · submitted 2026-01-20 · 🌌 astro-ph.CO

Recognition: 2 theorem links

· Lean Theorem

Revisiting the Matter Creation Process: Observational Constraints on Gravitationally Induced Dark Energy and the Hubble Tension

Tiziano Schiavone , Mariaveronica De Angelis , Luis A. Escamilla , Giovanni Montani , Eleonora Di Valentino
Authors on Pith no claims yet

Pith reviewed 2026-05-16 12:11 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords particle creationdark energyHubble tensionlate-time cosmologyphenomenological modelsobservational constraintsopen systemscosmic acceleration
0
0 comments X

The pith

Gravitationally induced particle creation fits data like ΛCDM while cutting the Hubble tension to 2.4-3 sigma.

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

The paper treats gravitationally induced particle creation as a non-equilibrium thermodynamic process that can generate an effective dynamical dark energy component at late times. Using four phenomenological parametrizations of the creation rate, with the equation-of-state parameter of the created matter left free, the authors perform joint fits to cosmic chronometers, supernovae, local Hubble measurements, baryon acoustic oscillations, and cosmic microwave background data. All four models achieve goodness-of-fit values comparable to the standard ΛCDM cosmology, and one parametrization produces behaviour that mimics evolving dark energy. When early-time and late-time datasets are analysed separately, the models bring the Hubble tension down to roughly 2.4-3 sigma, versus 4.3 sigma in ΛCDM. This framework therefore supplies a concrete, observationally viable late-time extension that addresses the expansion-rate discrepancy without altering early-universe physics.

Core claim

Within the thermodynamic description of open systems, gravitationally induced particle creation with four late-time (0<z<3) phenomenological rate parametrizations yields constraints on the extra component's equation-of-state parameter that are consistent with dark energy, while disfavoring creation of pressureless matter; the resulting models match ΛCDM fits and reduce the Hubble tension from 4.3 sigma to 2.4-3 sigma when early and late datasets are treated separately.

What carries the argument

Four phenomenological parametrizations of the gravitationally induced particle creation rate, with free equation-of-state w_E for the created component, applied only at late times in an open thermodynamic system.

If this is right

  • Particle creation of pressureless matter is ruled out by the data.
  • One parametrization produces effective dynamical dark-energy evolution.
  • All models achieve statistical fits comparable to ΛCDM.
  • Separate early- and late-time analyses lower the Hubble tension to 2.4-3 sigma.

Where Pith is reading between the lines

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

  • Future high-redshift Hubble measurements could test whether the late-time restriction remains valid.
  • The approach may supply a physical mechanism underlying other phenomenological dark-energy parametrizations.
  • Allowing creation at earlier epochs could be checked against big-bang nucleosynthesis bounds to see if it introduces new tensions.
  • The framework offers a route to connect thermodynamic non-equilibrium processes with observed cosmic acceleration.

Load-bearing premise

Deviations from ΛCDM due to particle creation are confined to the redshift range 0 to 3 and are accurately captured by the four chosen parametrizations of the creation rate.

What would settle it

A joint analysis of the full dataset that still finds the Hubble tension above 4 sigma, or direct evidence of significant particle creation at redshifts greater than 3.

Figures

Figures reproduced from arXiv: 2601.14222 by Eleonora Di Valentino, Giovanni Montani, Luis A. Escamilla, Mariaveronica De Angelis, Tiziano Schiavone.

Figure 1
Figure 1. Figure 1: FIG. 1. Triangular plots showing the 1D and 2D posterior distributions for the ΛCDM (left panels) and [PITH_FULL_IMAGE:figures/full_fig_p009_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Triangular plots showing the 1D and 2D posterior distributions for the PC models using the [PITH_FULL_IMAGE:figures/full_fig_p012_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Plots of the function [PITH_FULL_IMAGE:figures/full_fig_p013_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Plots of the deceleration parameter [PITH_FULL_IMAGE:figures/full_fig_p014_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Redshift evolution of the cosmological components in the PC1 model, computed using the best-fit parameter values [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Effective dark-energy equation-of-state parameter [PITH_FULL_IMAGE:figures/full_fig_p015_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Left panel: plot of the function [PITH_FULL_IMAGE:figures/full_fig_p017_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Plots of the function [PITH_FULL_IMAGE:figures/full_fig_p018_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Plot of the effective equation of state parameter of dark energy [PITH_FULL_IMAGE:figures/full_fig_p019_9.png] view at source ↗
read the original abstract

The Hubble tension and the unknown origin of dark energy motivate the exploration of alternative mechanisms for late-time cosmic acceleration. We investigate gravitationally induced particle creation (PC) as a non-equilibrium process that can effectively mimic dynamical dark energy. Within the thermodynamic framework of open systems, we adopt an agnostic approach to the extra created component, leaving its equation-of-state parameter $w_E$ free. We consider four phenomenological parametrisations of the PC rate, allowing deviations from the standard cosmological model ($\Lambda$CDM) only at late times ($0<z<3$). The PC models are constrained using a joint analysis of cosmic chronometers, Type Ia supernovae, local $H_0$ measurements, baryon acoustic oscillations, and cosmic microwave background data. The constraints on $w_E$ are consistent with dark energy, while particle creation of pressureless matter is disfavoured. All PC scenarios provide fits comparable to $\Lambda$CDM, with one showing effective dynamical dark-energy behaviour. When early- and late-time datasets are analysed separately, the PC models reduce the Hubble tension to $\simeq 2.4\,\sigma$--$3\,\sigma$, compared to $4.3\,\sigma$ in $\Lambda$CDM. Gravitationally induced dark energy thus offers a consistent late-time extension of $\Lambda$CDM and a viable theoretical framework for dynamical dark energy.

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

3 major / 3 minor

Summary. The manuscript investigates gravitationally induced particle creation (PC) within an open thermodynamic system framework as a mechanism to generate effective dynamical dark energy. It adopts four phenomenological parametrizations of the PC rate, restricted to late times (0 < z < 3), leaves the equation-of-state parameter w_E free, and constrains the models using cosmic chronometers, Type Ia supernovae, local H0, BAO, and CMB data. The key claims are that the PC models provide fits comparable to ΛCDM, with constraints on w_E consistent with dark energy, and that splitting early- and late-time datasets reduces the Hubble tension from 4.3σ in ΛCDM to 2.4σ–3σ in the PC scenarios.

Significance. If the central results hold, this work offers a thermodynamically motivated alternative to standard dark energy that can alleviate the Hubble tension at late times without additional fields. The approach of treating the created component agnostically with free w_E and comparing to data provides a testable framework, though its robustness depends on the validity of the imposed restrictions.

major comments (3)
  1. [§3] §3 (Phenomenological parametrizations): The four specific forms chosen for the particle creation rate are introduced directly as phenomenological functions without derivation from the open-system thermodynamic equations; because the reported tension reduction to 2.4–3σ is obtained only under these forms plus the explicit 0<z<3 cutoff, it remains unclear whether the improvement follows from the framework or is enabled by the parametrization choice.
  2. [Results section] Results section (tension quantification): The Hubble tension reduction is demonstrated exclusively for the split early-time versus late-time datasets under the late-time-only restriction; no analysis is shown for the full combined dataset or with the cutoff removed, leaving the robustness of the central claim untested.
  3. [§4] §4 (Constraints and likelihood): The statements that w_E is consistent with dark energy and pressureless-matter creation is disfavoured rest on joint fits, yet the manuscript provides neither the explicit likelihood forms, full posterior tables, nor error-budget breakdown; this gap prevents independent verification that the statistical conclusions are fully supported by the data.
minor comments (3)
  1. [§2] Notation for w_E should be introduced with an explicit equation relating it to the created component's energy density and pressure to avoid confusion with standard dark-energy parametrizations.
  2. [Figures] Figure captions comparing PC models to ΛCDM would be clearer if they included the numerical Δχ² or evidence ratios for each scenario.
  3. [§2] A brief statement on the thermodynamic consistency of setting particle creation to zero for z>3 would help readers assess the physical motivation of the cutoff.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on our manuscript. We address each major comment point by point below, providing clarifications where needed and indicating planned revisions to improve the paper.

read point-by-point responses

  1. Referee: [§3] §3 (Phenomenological parametrizations): The four specific forms chosen for the particle creation rate are introduced directly as phenomenological functions without derivation from the open-system thermodynamic equations; because the reported tension reduction to 2.4–3σ is obtained only under these forms plus the explicit 0<z<3 cutoff, it remains unclear whether the improvement follows from the framework or is enabled by the parametrization choice.

    Authors: We acknowledge that the four forms are introduced phenomenologically, as explicitly stated in the manuscript. However, they are chosen to represent plausible late-time behaviors consistent with the open thermodynamic system framework derived in Sec. 2, where the particle creation rate Γ enters the effective energy density and pressure. These specific parametrizations follow common choices in the literature for Γ(z) that allow dynamical effects confined to low redshifts. The tension reduction arises from the framework's provision of an effective dynamical dark energy component (with free w_E) at late times, rather than from arbitrary parametrization alone. To strengthen the connection, we will revise §3 to include a more explicit derivation linking the forms to the thermodynamic equations and discuss their generality within the model class. revision: partial

  2. Referee: [Results section] Results section (tension quantification): The Hubble tension reduction is demonstrated exclusively for the split early-time versus late-time datasets under the late-time-only restriction; no analysis is shown for the full combined dataset or with the cutoff removed, leaving the robustness of the central claim untested.

    Authors: The Hubble tension is conventionally quantified via separate early-time (primarily CMB) and late-time (CC, SNIa, BAO, local H0) constraints, as this isolates the discrepancy the PC models target. Because the models are constructed as late-time extensions (0<z<3), the split analysis directly demonstrates their impact. We agree that results for the full combined dataset and a test with the cutoff relaxed would further test robustness. We will add these analyses to the revised Results section, including constraints from the joint dataset and a brief exploration of a wider redshift range. revision: yes

  3. Referee: [§4] §4 (Constraints and likelihood): The statements that w_E is consistent with dark energy and pressureless-matter creation is disfavoured rest on joint fits, yet the manuscript provides neither the explicit likelihood forms, full posterior tables, nor error-budget breakdown; this gap prevents independent verification that the statistical conclusions are fully supported by the data.

    Authors: We agree that additional statistical details would improve transparency and verifiability. In the revised manuscript we will add an appendix containing the explicit likelihood functions for each dataset, full posterior tables for the key parameters (including w_E and the PC rate coefficients), and an error-budget breakdown that supports the statements on consistency with dark energy and the disfavoring of pressureless matter creation. revision: yes

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper explicitly adopts four phenomenological parametrizations of the creation rate with a late-time cutoff (0<z<3) and leaves w_E free, then performs standard joint and split-dataset fits to observational data. No claimed first-principles derivation or prediction reduces by construction to the fitted parameters or to a self-citation; the tension reduction (2.4-3σ vs 4.3σ) is reported as the direct numerical outcome of those fits. The thermodynamic open-system framework supplies only the general motivation, not the specific functional forms or cutoff, which are stated as chosen. The analysis is therefore a conventional data-driven model comparison with no load-bearing self-referential step.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central claim rests on a thermodynamic open-system description of gravitationally induced particle creation whose rate is parametrized phenomenologically and whose extra component's equation of state is left free and fitted to data.

free parameters (2)
  • w_E
    Equation-of-state parameter of the gravitationally created component, left free and constrained by data.
  • PC-rate parameters
    Coefficients in each of the four phenomenological creation-rate functions, fitted to observations.
axioms (2)
  • domain assumption Universe treated as an open thermodynamic system in which gravity induces particle creation
    Invoked to justify the non-equilibrium creation process that mimics dark energy.
  • ad hoc to paper Deviations from ΛCDM occur only at late times (0 < z < 3)
    Explicitly stated to restrict the models to late-time effects.

pith-pipeline@v0.9.0 · 5575 in / 1464 out tokens · 69242 ms · 2026-05-16T12:11:07.883785+00:00 · methodology

discussion (0)

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Forward citations

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