Phantom boundary crossing and anomalous growth index of fluctuations in viable f(R) models of cosmic acceleration

Details Phantom boundary crossing and anomalous growth index of fluctuations in viable f(R) models of cosmic acceleration Phantom boundary crossing and anomalous growth index of fluctuations in viable f(R) models of cosmic acceleration

2010-02-05

arxiv.org/abs/1002.1141v2

Prog. Theor. Phys. 123 (2010), 887-902

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 13 figures; Typos corrected, references added, discussion expanded

Scientific paper

10.1143/PTP.123.887

Evolution of a background space-time metric and sub-horizon matter density perturbations in the Universe is numerically analyzed in viable $f(R)$ models of present dark energy and cosmic acceleration. It is found that viable models generically exhibit recent crossing of the phantom boundary $w_{\rm DE}=-1$. Furthermore, it is shown that, 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 temporarily.

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