Back to Search
Start Over
Conformally flat generalized Ricci recurrent spacetimes and curvature-squared gravity.
- Source :
-
Modern Physics Letters A . 12/21/2023, Vol. 38 Issue 38/39, p1-15. 15p. - Publication Year :
- 2023
-
Abstract
- First, we illustrate that a conformally flat generalized Ricci recurrent spacetime is a perfect fluid spacetime. As a consequence, we prove that such a spacetime represents a dust matter fluid, stiff matter and dark energy era under certain restrictions on the Ricci scalar. Then we establish that such a spacetime is a Robertson–Walker spacetime. Also, we note that in a conformally flat generalized Ricci recurrent spacetime, the fluid is shear-free, vorticity-free and its flow vector is hypersurface orthogonal. We investigate a conformally flat generalized Ricci recurrent spacetime as a solution of curvature-squared gravity theory. In this study, various energy conditions in terms of the Ricci scalar are examined and state that the Universe is in an accelerating phase and satisfies the weak, null, dominant, and strong energy conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *EXPANDING universe
*GRAVITY
*SPACETIME
*DARK matter
*DARK energy
Subjects
Details
- Language :
- English
- ISSN :
- 02177323
- Volume :
- 38
- Issue :
- 38/39
- Database :
- Academic Search Index
- Journal :
- Modern Physics Letters A
- Publication Type :
- Academic Journal
- Accession number :
- 174914984
- Full Text :
- https://doi.org/10.1142/S0217732323501663