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arXiv 0907.0860hep-th
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一个修正的红外无限维全息暗能量模型

A Modified Holographic Dark Energy Model with Infrared Infinite Extra Dimension(s)

Yungui Gong, Tianjun Li

摘要:

提出了一个修正的全息暗能量(MHDE)模型。在极大距离尺度下引入无限额外维,我们考虑高维黑洞质量作为紫外截止。因此,我们可以探测IR无限额外维度的影响。作为一个具体的例子,我们考虑Dvali-Gabadadze-Porrati(DGP)模型及其推广。我们发现DGP模型与MHDE模型在五维上是对偶的,而$Λ$ CDM模型与MHDE模型在六维上是对偶的.用MHDE模型对观测数据进行拟合,得到$Ω_{m0}=0.269^{+0.030}_{-0.027}$,$Ω_{k0}=0.003^{+0.011}_{-0.012}$,空间维数为$N=4.78^{+0.68}_{-0.44}$ . $N$的最佳拟合值表明可能存在两个IR无限额外维。

英文摘要:

We propose a modified holographic dark energy (MHDE) model with the Hubble scale as the infrared (IR) cutoff. Introducing the infinite extra dimension(s) at very large distance scale, we consider the black hole mass in higher dimensions as the ultraviolet cutoff. Thus, we can probe the effects of the IR infinite extra dimension(s). As a concrete example, we consider the Dvali-Gabadadze-Porrati (DGP) model and its generalization. We find that the DGP model is dual to the MHDE model in five dimensions, and the $Λ$CDM model is dual to the MHDE model in six dimensions. Fitting the MHDE model to the observational data, we obtain that $Ω_{m0}=0.269^{+0.030}_{-0.027}$, $Ω_{k0}=0.003^{+0.011}_{-0.012}$, and the number of the spatial dimensions is $N=4.78^{+0.68}_{-0.44}$. The best fit value of $N$ implies that there might exist two IR infinite extra dimensions.

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