Perturbative Analysis of Singularity-Free Cosmological Solutions in Unimodular Kaluza–Klein Theory
Abstrak
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, det<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>g</mi><mrow><mi>A</mi><mi>B</mi></mrow></msub><mo>=</mo><mn>1</mn></mrow></semantics></math></inline-formula> 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.
Topik & Kata Kunci
Penulis (3)
Júlio C. Fabris
Stéfani Faller
Richard Kerner
Akses Cepat
- Tahun Terbit
- 2026
- Sumber Database
- DOAJ
- DOI
- 10.3390/universe12030075
- Akses
- Open Access ✓