Focal Interest
Focal Interest
AI Summary of Peer-Reviewed Research

This page presents an AI-generated summary of a published research paper. The original authors did not write or review this article. [See full disclosure ↓]

Publishing process signals: MODERATE — reflects the venue and review process. — venue and review process.

Particle creation model explains cosmic expansion without dark energy

Research area:Physics and AstronomyCosmology and Gravitation TheoriesCosmology

What the study found

A dark-energy-free cosmological model based on gravitationally induced adiabatic particle creation is proposed. The authors report that it can reproduce a Lambda CDM-like expansion for suitable values of its parameters and that it evolves smoothly between two de Sitter phases.

Why the authors say this matters

The authors conclude that the model offers a singularity-free, unified cosmological scenario. They also suggest that the small deviations introduced by one parameter may provide a possible way to address the H0 and S8 tensions in current cosmology.

What the researchers tested

The researchers developed a cosmological model with four components and two free parameters, alpha and beta, using thermodynamics of particle production to generate an effective negative pressure. They compared the model with type Ia Supernovae data from Pantheon+SH0ES and H(z) data.

What worked and what didn't

The model was reported to reproduce Lambda CDM-like expansion for suitable alpha values. The data constraints indicate beta is approximately 0.13, and the authors describe this as a mild departure from standard cosmology.

What to keep in mind

The abstract does not describe detailed limitations beyond the fact that the model depends on parameter choices. It also does not provide full methodological details or quantify how much the H0 and S8 tensions are relieved.

Key points

  • The paper proposes a cosmological model with no dark energy.
  • Gravitationally induced adiabatic particle creation is used to generate effective negative pressure.
  • The model is said to reproduce Lambda CDM-like expansion for suitable alpha values.
  • Data from Pantheon+SH0ES supernovae and H(z) observations suggest beta is about 0.13.
  • The authors suggest the model may help with the H0 and S8 tensions.

Disclosure

Research title:
Particle creation model explains cosmic expansion without dark energy
Authors:
Pedro U. Lima, J. A. S. Lima
Institutions:
Universidade de São Paulo
Publication date:
2026-04-25
DOI:
10.1140/epjc/s10052-026-15631-1
OpenAlex record:
View
AI provenance: This post was generated by OpenAI. The original authors did not write or review this post.

More posts