Growth Index of DGP Model and Current Growth Rate Data

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dc.creatorWei, Hao
dc.date2008-02-28
dc.date2008-05-31
dc.date.accessioned2026-07-07T11:40:31Z
dc.date.available2026-07-07T11:40:31Z
dc.descriptionRecently, some efforts focus on differentiating dark energy and modified gravity with the growth function $δ(z)$. In the literature, it is useful to parameterize the growth rate $f\equiv d\lnδ/d\ln a=Ω_m^γ$ with the growth index $γ$. In this note, we consider the general DGP model with any $Ω_k$. We confront the growth index of DGP model with currently available growth rate data and find that the DGP model is still consistent with it. This implies that more and better growth rate data are required to distinguish between dark energy and modified gravity.
dc.description12 pages, 1 table, 2 figures, Latex2e; v2: discussions added, Phys. Lett. B in press; v3: published version
dc.identifierhttps://arxiv.org/abs/0802.4122
dc.identifierhttp://arxiv.org/abs/0802.4122
dc.identifierPhys.Lett.B664:1-6,2008
dc.identifierdoi:10.1016/j.physletb.2008.04.060
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200281
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleGrowth Index of DGP Model and Current Growth Rate Data
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