Phantom behaviour and growth index anomalous evolution in viable f(R) gravity models

Details Phantom behaviour and growth index anomalous evolution in viable f(R) gravity models Phantom behaviour and growth index anomalous evolution in viable f(R) gravity models

2010-02-02

arxiv.org/abs/1002.0462v2

Proceedings of the 19nth Workshop on General Relativity and Gravitation in Japan, 239-242 (2010) http://www2.rikkyo.ac.jp/we

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 6 figures. To be published in the Proceedings of 19th Workshop in General Relativity and Gravitation in Japan (JGRG19

Scientific paper

We present numerical calculation of the evolution of a background space-time metric and sub-horizon matter density perturbations in viable $f(R)$ gravity models of present dark energy and cosmic acceleration. We found that viable models generically exhibit recent crossing of the phantom boundary $w_{DE}=-1$. Moreover, as a consequence of the anomalous growth of density perturbations during the end of the matter-dominated stage, their growth index evolves non-monotonically with time and may even become negative.

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