Cosmic Expansion Driven by Gravitational Particle Production: Toward a Complete Cosmological Scenario
Abstract
A dark-energy-free cosmological model () 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 (, ), reproduces a CDM-like expansion for suitable , while introduces small but testable deviations from the cosmic concordance model. Constraints from type Ia Supernovae (Pantheon+SH0ES) and H(z) data indicate , suggesting a mild departure from standard cosmology and possible relief of the and 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.
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