Cosmological stealths with nonconformal couplings
General Relativity and Quantum Cosmology
2018-02-13 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
In this paper we reconsider the existence of stealth fields during the evolution of our Universe by admitting more realistic nonminimal couplings to gravity than the conformal one. In the framework of the FRW cosmology we found that inhomogeneous stealths, as those enabled in the conformal case, are only allowed in de Sitter backgrounds. In particular, it is shown that the homogeneous stealths resulting from nonconformal couplings can coexist with each kind of matter dominant in the several phases characterizing the evolution of our Universe according to the CDM model.
Cite
@article{arxiv.1512.09375,
title = {Cosmological stealths with nonconformal couplings},
author = {Eloy Ayón-Beato and P. Isaac Ramírez-Baca and César A. Terrero-Escalante},
journal= {arXiv preprint arXiv:1512.09375},
year = {2018}
}
Comments
16 pages, 10 figures Approved to appear at Phys. Rev. D