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Multifluid cosmology in f(G) gravity.
- Source :
-
International Journal of Geometric Methods in Modern Physics . Feb2023, Vol. 20 Issue 2, p1-51. 51p. - Publication Year :
- 2023
-
Abstract
- The treatment of (1+3)-covariant perturbation in a multifluid cosmology with the consideration of f (G) gravity, G being the Gauss–Bonnet term, is done in this paper. We define a set of covariant and gauge-invariant variables to describe density, velocity and entropy perturbations for both the total matter and component fluids. We then use different techniques such as scalar decomposition, harmonic decomposition, quasi-static approximation together with the redshift transformation to get simplified perturbation equations for analysis. We then discuss a number of interesting applications like the case where the universe is filled with a mixture of radiation and Gauss–Bonnet fluids as well as dust with Gauss–Bonnet fluids for both short- and long-wavelength limits. Considering polynomial f (G) model, we get numerical solutions of energy density perturbations and show that they decay with increase in redshift. This feature shows that under f (G) gravity, specifically under the considered f (G) model, one expects that the formation of the structure in the late Universe is enhanced. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02198878
- Volume :
- 20
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- International Journal of Geometric Methods in Modern Physics
- Publication Type :
- Academic Journal
- Accession number :
- 161723879
- Full Text :
- https://doi.org/10.1142/S0219887823500317