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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2511.13392 |
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| _version_ | 1866912715104059392 |
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| author | Lima, P. W. R. Lima, J. A. S. |
| author_facet | Lima, P. W. R. Lima, J. A. S. |
| contents | A dark-energy-free cosmological model ($Ω_{DE} \equiv 0$) based on gravitationally induced adiabatic particle creation is proposed. The thermodynamics of particle production yields an effective negative pressure that drives both primordial inflation and late-time cosmic acceleration. The model, characterized by four components and two free parameters ($α$, $β$), reproduces a $Λ$CDM-like expansion for suitable $α$, while $β$ introduces small but testable deviations from the cosmic concordance model. Constraints from type Ia Supernovae (Pantheon+SH0ES) and H(z) data indicate $β\simeq 0.13$, suggesting a mild departure from standard cosmology and possible relief of the $H_0$ and $S_8$ tensions. The resulting classical cosmology evolves smoothly between two extreme de Sitter phases, offering a singularity-free, unified scenario that beyond solving old cosmological puzzles opens a new perspective to handle the tensions plaguing the current cosmic concordance model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_13392 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmic Expansion Driven by Gravitational Particle Production: Toward a Complete Cosmological Scenario Lima, P. W. R. Lima, J. A. S. Cosmology and Nongalactic Astrophysics A dark-energy-free cosmological model ($Ω_{DE} \equiv 0$) based on gravitationally induced adiabatic particle creation is proposed. The thermodynamics of particle production yields an effective negative pressure that drives both primordial inflation and late-time cosmic acceleration. The model, characterized by four components and two free parameters ($α$, $β$), reproduces a $Λ$CDM-like expansion for suitable $α$, while $β$ introduces small but testable deviations from the cosmic concordance model. Constraints from type Ia Supernovae (Pantheon+SH0ES) and H(z) data indicate $β\simeq 0.13$, suggesting a mild departure from standard cosmology and possible relief of the $H_0$ and $S_8$ tensions. The resulting classical cosmology evolves smoothly between two extreme de Sitter phases, offering a singularity-free, unified scenario that beyond solving old cosmological puzzles opens a new perspective to handle the tensions plaguing the current cosmic concordance model. |
| title | Cosmic Expansion Driven by Gravitational Particle Production: Toward a Complete Cosmological Scenario |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2511.13392 |