What the study found
The study proposes a cosmological model with no dark energy, based on gravitationally induced adiabatic particle creation. The authors report that this model can reproduce a Lambda-CDM-like expansion for suitable values of alpha, while beta allows small deviations from the standard cosmic concordance model.
Why the authors say this matters
The authors conclude that the model offers a singularity-free, unified scenario that evolves smoothly between two extreme de Sitter phases, and they suggest it provides a new perspective for addressing the Hubble constant and S8 tensions. They also state that it may help solve older cosmological puzzles.
What the researchers tested
The researchers examined a dark-energy-free cosmological model with four components and two free parameters, alpha and beta. They compared its predictions with type Ia supernova data from Pantheon+SH0ES and H(z) data, where H(z) refers to measurements of the expansion rate as a function of redshift.
What worked and what didn't
For suitable alpha values, the model reproduces a Lambda-CDM-like expansion. The data constrain beta to be about 0.13, which the authors describe as indicating a mild departure from standard cosmology; they also note that this may offer some relief of the H0 and S8 tensions.
What to keep in mind
The abstract does not describe detailed limitations beyond the parameter constraints reported from the data. The claims about tension relief and a unified scenario are presented by the authors as conclusions from the model, not as established empirical resolution.
Key points
- The paper proposes a dark-energy-free cosmological model based on gravitationally induced adiabatic particle creation.
- The model is described as having four components and two free parameters, alpha and beta.
- The authors report that suitable alpha values produce Lambda-CDM-like expansion.
- Data from Pantheon+SH0ES supernovae and H(z) measurements suggest beta is about 0.13.
- The authors say the model may offer a mild departure from standard cosmology and possible relief of the H0 and S8 tensions.
Disclosure
- Research title:
- Particle creation model reproduces cosmic expansion without dark energy
- Authors:
- Pedro U. Lima, J. A. S. Lima
- Institutions:
- Universidade de São Paulo, Universidade de São Paulo
- Publication date:
- 2026-04-25
- OpenAlex record:
- View
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