Back to Search
Start Over
Logarithmic gravity model.
- Source :
-
International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology . Apr2023, Vol. 32 Issue 6, p1-11. 11p. - Publication Year :
- 2023
-
Abstract
- In this paper, the modified F (R) gravity theory with the function F (R) = − (1 / β) ln (1 − β R) is studied. The action at small coupling β becomes Einstein–Hilbert action. The bound on the parameter β from local tests is β ≤ 2 × 1 0 − 6 cm2. We find the constant curvature solutions and it was shown that the de Sitter space is unstable but a solution with zero Ricci scalar is stable. The potential and the mass of the scalar field (scalaron) are obtained in Einstein's frame. The slow-roll cosmological parameters are studied and e-folds number is evaluated. The critical points of autonomous equations are analyzed. The function m (r) that describes the deviation from the Λ CDM model is calculated. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EINSTEIN-Hilbert action
*DARK energy
*CURVATURE
*GRAVITY
Subjects
Details
- Language :
- English
- ISSN :
- 02182718
- Volume :
- 32
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology
- Publication Type :
- Academic Journal
- Accession number :
- 163748300
- Full Text :
- https://doi.org/10.1142/S0218271823500372