DGP模型的增长指数和当前增长率数据
Growth Index of DGP Model and Current Growth Rate Data
摘要：
最近，一些努力集中在区分暗能量和修改的重力与增长函数$δ(z)$。在文献中，用生长指数$γ$参数化生长速率$f\equiv d\lnδ/d\ln a=Ω_m^γ$是有用的。本文考虑了具有任意$Ω_k$的一般DGP模型。我们将DGP模型的增长指数与现有的增长率数据进行了对比，发现DGP模型与增长指数仍然是一致的，这意味着需要更多更好的增长率数据来区分暗能量和修正引力。
英文摘要：
Recently, 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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
