On multifluid perturbations in scalar-tensor cosmology
General Relativity and Quantum Cosmology
2020-11-30 v1 High Energy Physics - Theory
Abstract
In this paper the scalar-tensor theory is applied to the study of perturbations in a multi-fluid universe, using the 1+3 covariant approach. Both scalar and harmonic decompositions are instituted on the perturbation equations. In particular, as an application, we study perturbations on a background FRW cosmology consisting of both radiation and dust in the presence of a scalar field. We consider both radiation-dominated and dust-dominated epochs, respectively, and study the results. During the analysis, quasi-static approximation is instituted. It is observed that the fluctuations of the energy density decrease with increasing redshift, for different values of of a power law model
Cite
@article{arxiv.2011.13198,
title = {On multifluid perturbations in scalar-tensor cosmology},
author = {Joseph Ntahompagaze and Shambel Sahlu and Amare Abebe and Manasse R. Mbonye},
journal= {arXiv preprint arXiv:2011.13198},
year = {2020}
}
Comments
Accepted for International Journal of Modern Physics D