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

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arxiv 1002.0462 v2 pith:UBG5R7LC submitted 2010-02-02 astro-ph.CO

Hayato Motohashi , Alexei A. Starobinsky , Jun'ichi Yokoyama This is my paper
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keywords growthmodelsviableanomalousdensityevolutiongravityindex
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abstract

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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Cited by 1 Pith paper

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