Perturbative Analysis of Singularity-Free Cosmological Solutions in Unimodular Kaluza–Klein Theory
The unimodular version of the Kaluza–Klein theory is briefly discussed, and its projection onto four-dimensional spacetime is constructed. Imposing the unimodularity condition on the five-dimensional Kaluza–Klein metric, detgAB=1 is equivalent to introducing a cosmological term in Einstein’s equations in four dimensions with a scalar field of the Brans–Dicke type. Singularity-free cosmological solutions with scalar field and matter sources are constructed, and their basic properties are analyzed In the present paper, attention is focused on the perturbative analysis of cosmological solutions, providing insights into their stability against small fluctuations.
Authors
- J. C. Fabris (ORCID: https://orcid.org/0000-0001-8880-107X)
- Richard Kerner (ORCID: https://orcid.org/0000-0001-8376-6535)
- Stéfani Faller
Institutions
- Sorbonne Université (FR)
- Laboratoire de Physique Théorique de la Matière Condensée (FR)
- Universidade Federal do Espírito Santo (BR)
Publication Details
- Journal
- Universe
- Published
- 2026-03-09
- DOI
- https://doi.org/10.3390/universe12030075
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Fundação de Amparo à Pesquisa e Inovação do Espírito Santo