Holographic dark energy in Brans–Dicke theory
Holographic dark energy in Brans–Dicke theory
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DOI：
10.1140/epjc/s10052-008-0858-1
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
Lixin Xu;Wenbo Li;Jianbo Lu
中科院分区：
文献类型：
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作者：
Lixin Xu;Wenbo Li;Jianbo Lu
本文考虑Brans-Dicke理论中的全息暗能量模型，其中全息暗能量密度ρΛ= 3c 2 Mp 12 L − 2被ρh= 3c 2 Φ（t）L−2代替。这是随时间变化的牛顿常数。通过这种替换，我们发现当哈勃视界被用来充当红外截止时，宇宙的加速膨胀将不会实现。当采用事件视界作为红外截止点时，得到了宇宙的加速膨胀。在这种情况下，全息暗能量的状态方程wh采用修改后的形式。在极限α→0时，“标准”全息暗能量被恢复。在全息暗能量占主导地位的时期，幂律和deSitter时空解。
In this paper, the holographic dark-energy model is considered in Brans–Dicke theory, where the holographic dark-energy densityρΛ=3c2Mpl2L−2is replaced byρh=3c2Φ(t)L−2. Hereis the time-variable Newton constant. With this replacement, it is found that no accelerated expansion for the universe will be achieved when the Hubble horizon is taken to play the role of an IR cut-off. When the event horizon is adopted as the IR cut-off, accelerated expansion for the universe is obtained. In this case, the equation of state of holographic dark energy,wh, takes the modified form. In the limitα→0, the ‘standard’ holographic dark energy is recovered. In the holographic dark-energy dominated epoch, power-law and de Sitter time-space solutions are obtained.