Phantom-Like Behavior in $f(R)$-Gravity

Details Phantom-Like Behavior in $f(R)$-Gravity Phantom-Like Behavior in $f(R)$-Gravity

2009-09-02

arxiv.org/abs/0909.0351v2

Phys.Lett.B680:205-211,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, Revised Version, To appear in PLB

Scientific paper

10.1016/j.physletb.2009.08.066

We investigate possible realization of the phantom-like behavior in the framework of $f(R)$-gravity models where there are no phantom fields in the matter sector of the theory. By adopting some observationally reliable ansatz for $f(R)$, we show that it is possible to realize phantom-like behavior in $f(R)$-gravity without introduction of phantom fields that suffer from instabilities and violation of the null energy condition. Depending on the choice of $f(R)$, the null energy condition is fulfilled in some subspaces of each model parameter space.

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