Cosmology and Stability in Scalar-Tensor bigravity
High Energy Physics - Theory
2015-06-17 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
The bigravity models coupled with two scalar fields are constructed. We show that a wide class of the expansion history of the universe, especially corresponding to dark energy and/or inflation, can be described by a solution of the bigravity model. We discuss the stability of the solution and give the conditions for the stability. We also explicitly construct a model which gives a stable solution. By using the stable model, for an arbitrary evolution of the universe expansion, we construct the Brans-Dicke like model which reproduces the evolution.
Cite
@article{arxiv.1310.1460,
title = {Cosmology and Stability in Scalar-Tensor bigravity},
author = {Kazuharu Bamba and Yusuke Kokusho and Shin'ichi Nojiri and Norihito Shirai},
journal= {arXiv preprint arXiv:1310.1460},
year = {2015}
}
Comments
LaTeX 13 pages, no figure, version to appear in Classical and Quantum Gravity