Skip to main content

Research Repository

Advanced Search

Cosmological constraints on f(G) dark energy models

Zhou, Shuang-Yong; Copeland, Edmund J.; Saffin, Paul M.

Cosmological constraints on f(G) dark energy models Thumbnail


Authors

Shuang-Yong Zhou

PAUL SAFFIN PAUL.SAFFIN@NOTTINGHAM.AC.UK
Professor of Physics



Abstract

Modified gravity theories with the Gauss-Bonnet term G=R2?4R??R??+R????R???? have recently gained a lot of attention as a possible explanation of dark energy. We perform a thorough phase space analysis on the so-called f(G) models, where f(G) is some general function of the Gauss-Bonnet term, and derive conditions for the cosmological viability of f(G) dark energy models. Following the f(R) case, we show that these conditions can be nicely presented as geometrical constraints on the derivatives of f(G). We find that for general f(G) models there are two kinds of stable accelerated solutions, a de Sitter solution and a phantom-like solution. They co-exist with each other and which solution the universe evolves to depends on the initial conditions. Finally, several toy models of f(G) dark energy are explored. Cosmologically viable trajectories that mimic the ?CDM model in the radiation and matter dominated periods, but have distinctive signatures at late times, are obtained.

Citation

Zhou, S., Copeland, E. J., & Saffin, P. M. (2009). Cosmological constraints on f(G) dark energy models. Journal of Cosmology and Astroparticle Physics, 2009(7), https://doi.org/10.1088/1475-7516/2009/07/009

Journal Article Type Article
Acceptance Date Jun 19, 2009
Publication Date Jul 6, 2009
Deposit Date Apr 21, 2017
Publicly Available Date Apr 21, 2017
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2009
Issue 7
DOI https://doi.org/10.1088/1475-7516/2009/07/009
Public URL https://nottingham-repository.worktribe.com/output/705519
Publisher URL http://iopscience.iop.org/article/10.1088/1475-7516/2009/07/009/meta

Files




You might also like



Downloadable Citations