English

Cosmic Expansion Driven by Gravitational Particle Production: Toward a Complete Cosmological Scenario

Cosmology and Nongalactic Astrophysics 2025-11-18 v1

Abstract

A dark-energy-free cosmological model (ΩDE0\Omega_{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\alpha, β\beta), reproduces a Λ\LambdaCDM-like expansion for suitable α\alpha, while β\beta introduces small but testable deviations from the cosmic concordance model. Constraints from type Ia Supernovae (Pantheon+SH0ES) and H(z) data indicate β0.13\beta \simeq 0.13, suggesting a mild departure from standard cosmology and possible relief of the H0H_0 and S8S_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.

Keywords

Cite

@article{arxiv.2511.13392,
  title  = {Cosmic Expansion Driven by Gravitational Particle Production: Toward a Complete Cosmological Scenario},
  author = {P. W. R. Lima and J. A. S. Lima},
  journal= {arXiv preprint arXiv:2511.13392},
  year   = {2025}
}

Comments

23 pages and 5 figures