2009
DOI: 10.1088/1475-7516/2009/06/019
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Abstract: We propose a parametrization for the growth index of the linear matter perturbations, γ(z) = γ 0 + z 1+z γ 1 . The growth factor of the perturbations parameterized as Ω γ m is analyzed for both the wCDM model and the DGP model with our proposed form for γ. We find that γ 1 is negative for the wCDM model but is positive for the DGP model. Thus it provides another signature to discriminate them. We demonstrate that Ω γ m with γ taking our proposed form approximates the growth factor very well both at low and hig… Show more

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Cited by 44 publications
(75 citation statements)
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References 74 publications
(72 reference statements)
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“…(46) As expected, for the Λ cosmology (b = 0) the above formula reduces to its standard expression [45][46][47][48][49]. Lastly, inserting γ 0 = γ ∞ − γ 1 into Eq.…”
Section: B Varying Growth Indexmentioning
confidence: 57%
See 1 more Smart Citation
“…(46) As expected, for the Λ cosmology (b = 0) the above formula reduces to its standard expression [45][46][47][48][49]. Lastly, inserting γ 0 = γ ∞ − γ 1 into Eq.…”
Section: B Varying Growth Indexmentioning
confidence: 57%
“…(31) and (38). In this work we consider the most popular γ(a) parametrization that has appeared in the literature (see [45][46][47][48][49]), which is a Taylor expansion around a(z) = 1…”
Section: B Varying Growth Indexmentioning
confidence: 99%
“…It has been noted that in General Relativity the slope is positive [23,36,37]. For all clustering dark energy models that we have considered, the slope for the growth index is positive, γ b > 0 (see table II).…”
Section: Growth Indexmentioning
confidence: 78%
“…Actually the possible running of this index was also considered; for the recent progress on a parametrized approach, please see [34]. The focus of this paper is to investigate the growth index in GR and MG theory.…”
Section: Introductionmentioning
confidence: 99%