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Statefinder diagnosis for the Palatini $f(R)$ gravity theories | | Song Li
; Hao-Ran Yu
; Tong-Jie Zhang
; | | Date: |
20 Feb 2010 | | Abstract: | The Palatini $f(R)$ gravity, is able to probably explain the late time cosmic
acceleration without the need for dark energy, is studied. In this paper, we
investigate a number of $f(R)$ gravity theories in Palatini formalism by means
of statefinder diagnosis. We consider two types of $f(R)$ theories: (i)
$f(R)=R+alpha R^{m}-eta R^{-n}$ and (ii) $f(R)=R+alpha ln R+eta$. We find
that the evolutionary trajectories in the $s-r$ and $q-r$ planes for various
types of the Palatini $f(R)$ theories reveal different evolutionary properties
of the universe. Additionally, we use the observational $H(z)$ data to
constrain models of $f(R)$ gravity. | | Source: | arXiv, 1002.3867 | | Services: | Forum | Review | PDF | Favorites | |
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