Effect of the Chameleon Scalar Field on Brane Cosmological Evolution
General Relativity and Quantum Cosmology
2017-12-12 v1
Abstract
We have investigated a brane world model in which the gravitational field in the bulk is described both by a metric tensor and a minimally coupled scalar field. This scalar field is taken to be a chameleon with an appropriate potential function. The scalar field interacts with matter and there is an energy transfer between the two components. We find a late-time asymptotic solution which exhibits late-time accelerating expansion. We also show that the Universe recently crosses the phantom barrier without recourse to any exotic matter. We provide some thermodynamic arguments which constrain both the direction of energy transfer and dynamics of the extra dimension.
Keywords
Cite
@article{arxiv.1710.07949,
title = {Effect of the Chameleon Scalar Field on Brane Cosmological Evolution},
author = {Y. Bisabr and F. Ahmadi},
journal= {arXiv preprint arXiv:1710.07949},
year = {2017}
}
Comments
9 pages, 4 figures. To appear in Physics Letters B