Five-dimensional metric $f(R)$ gravity and the accelerated universe

Details Five-dimensional metric $f(R)$ gravity and the accelerated universe Five-dimensional metric $f(R)$ gravity and the accelerated universe

2009-12-23

arxiv.org/abs/0912.4581v2

Phys.Rev.D81:064003,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 9 figures; Version published in PRD

Scientific paper

The metric $f(R)$ theories of gravity are generalized to five-dimensional spacetimes. By assuming a hypersurface-orthogonal Killing vector field representing the compact fifth dimension, the five-dimensional theories are reduced to their four-dimensional formalism. Then we study the cosmology of a special class of $f(R)=\alpha R^m$ models in a spatially flat FRW spacetime. It is shown that the parameter $m$ can be constrained to a certain range by the current observed deceleration parameter, and its lower bound corresponds to the Kaluza-Klein theory. It turns out that both expansion and contraction of the extra dimension may prescribe the smooth transition from the deceleration era to the acceleration era in the recent past as well as an accelerated scenario for the present universe. Hence five-dimensional $f(R)$ gravity can naturally account for the present accelerated expansion of the universe. Moreover, the models predict a transition from acceleration to deceleration in the future, followed by a cosmic recollapse within finite time. This differs from the prediction of the five-dimensional Brans-Dicke theory but is in consistent with a recent prediction based on loop quantum cosmology.

Affiliated with

Also associated with

No associations

Rating

Five-dimensional metric $f(R)$ gravity and the accelerated universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Five-dimensional metric $f(R)$ gravity and the accelerated universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Five-dimensional metric $f(R)$ gravity and the accelerated universe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-362890