Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.14222 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914508735250432 |
|---|---|
| author | Schiavone, Tiziano De Angelis, Mariaveronica Escamilla, Luis A. Montani, Giovanni Di Valentino, Eleonora |
| author_facet | Schiavone, Tiziano De Angelis, Mariaveronica Escamilla, Luis A. Montani, Giovanni Di Valentino, Eleonora |
| contents | 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 ($Λ$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 $Λ$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 $\simeq 2.4\,σ$--$3\,σ$, compared to $4.3\,σ$ in $Λ$CDM. Gravitationally induced dark energy thus offers a consistent late-time extension of $Λ$CDM and a viable theoretical framework for dynamical dark energy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_14222 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Revisiting the Matter Creation Process: Observational Constraints on Gravitationally Induced Dark Energy and the Hubble Tension Schiavone, Tiziano De Angelis, Mariaveronica Escamilla, Luis A. Montani, Giovanni Di Valentino, Eleonora Cosmology and Nongalactic Astrophysics 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 ($Λ$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 $Λ$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 $\simeq 2.4\,σ$--$3\,σ$, compared to $4.3\,σ$ in $Λ$CDM. Gravitationally induced dark energy thus offers a consistent late-time extension of $Λ$CDM and a viable theoretical framework for dynamical dark energy. |
| title | Revisiting the Matter Creation Process: Observational Constraints on Gravitationally Induced Dark Energy and the Hubble Tension |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2601.14222 |