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arXiv 1306.1289astro-ph.CO
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新年龄暗能量相互作用模型的再认识

Revisiting the interacting model of new agegraphic dark energy

Jing-Fei Zhang, Li-Ang Zhao, Xin Zhang

摘要:

本文提出了新年龄暗能量(INADE)相互作用模型的一个新版本,并对其进行了详细的分析。重新考虑了暗能量与暗物质的相互作用。采用了相互作用项$Q=bH_0ρ_{\rm de}^αρ_{\rm dm}^{1-α}$,它舍弃了哈勃膨胀率$H$,同时涉及到$ρ_{\rm de}$和$ρ_{\rm dm}$。此外,对年龄暗能量采用了新的初始条件,解决了模型中重子物质和辐射的容纳问题。模型的解可以使用迭代算法给出。给出了模型计算的具体实例。此外,该模型的约束,通过使用组合的普朗克数据(普朗克+BAO+SNIa+ $H_0$)和组合的WMAP-9数据(WMAP+BAO+SNIa+ $H_0$)。考虑三种典型情况:(A)$Q=bH_0ρ_{\rm de}$、(B)$Q=bH_0\sqrt{ρ_{\rm de}ρ_{\rm dm}}$和(C)$Q=bH_0ρ_{\rm dm}$,它们分别对应于$α=1$、1/2和0。模型与$Λ$ CDM模型的偏差由$Δ$ BIC和$Δ$ AIC值测量。结果表明,INADE模型的拟合效果优于NADE模型,其中INADE(A)模型的拟合效果最好。

英文摘要:

In this paper, a new version of the interacting model of new agegraphic dark energy (INADE) is proposed and analyzed in detail. The interaction between dark energy and dark matter is reconsidered. The interaction term $Q=bH_0ρ_{\rm de}^αρ_{\rm dm}^{1-α}$ is adopted, which abandons the Hubble expansion rate $H$ and involves both $ρ_{\rm de}$ and $ρ_{\rm dm}$. Moreover, the new initial condition for the agegraphic dark energy is used, which solves the problem of accommodating baryon matter and radiation in the model. The solution of the model can be given using an iterative algorithm. A concrete example for the calculation of the model is given. Furthermore, the model is constrained by using the combined Planck data (Planck+BAO+SNIa+$H_0$) and the combined WMAP-9 data (WMAP+BAO+SNIa+$H_0$). Three typical cases are considered: (A) $Q=bH_0ρ_{\rm de}$, (B) $Q=bH_0\sqrt{ρ_{\rm de}ρ_{\rm dm}}$, and (C) $Q=bH_0ρ_{\rm dm}$, which correspond to $α=1$, 1/2, and 0, respectively. The departures of the models from the $Λ$CDM model are measured by the $Δ$BIC and $Δ$AIC values. It is shown that the INADE model is better than the NADE model in the fit, and the INADE(A) model is the best in fitting data among the three cases.

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