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arXiv 0912.0923astro-ph.COgr-qchep-th
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变引力常量条件下全息暗能量的观测约束

Observational constraints on holographic dark energy with varying gravitational constant

Jianbo Lu, Emmanuel N. Saridakis, M. R. Setare, Lixin Xu

摘要:

我们利用Ia型超新星(SN)、重子声学振荡(BAO)、宇宙微波背景辐射(CMB)和哈勃观测数据(OHD)的观测数据,以及马尔可夫链蒙特卡罗(MCMC)方法,对具有不同引力常量的全息暗能量的宇宙学情形进行了约束。我们考虑平坦和非平坦的背景几何形状,我们提出了相应的约束和轮廓图的模型参数。我们的结论是,该方案是兼容的观察。在1 $σ$中,我们发现$Ω_{\Lambda0}=0.72^{+0.03}_{-0.03}$,$Ω_{k0}=-0.0013^{+0.0130}_{-0.0040}$,$c=0.80^{+0.19}_{-0.14}$和$Δ_G\equiv G'/G=-0.0025^{+0.0080}_{-0.0050}$,而对于暗能量状态方程参数的当前值,我们得到$w_0=-1.04^{+0.15}_{-0.20}$。

英文摘要:

We use observational data from Type Ia Supernovae (SN), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) and observational Hubble data (OHD), and the Markov Chain Monte Carlo (MCMC) method, to constrain the cosmological scenario of holographic dark energy with varying gravitational constant. We consider both flat and non-flat background geometry, and we present the corresponding constraints and contour-plots of the model parameters. We conclude that the scenario is compatible with observations. In 1$σ$ we find $Ω_{\Lambda0}=0.72^{+0.03}_{-0.03}$, $Ω_{k0}=-0.0013^{+0.0130}_{-0.0040}$, $c=0.80^{+0.19}_{-0.14}$ and $Δ_G\equiv G'/G=-0.0025^{+0.0080}_{-0.0050}$, while for the present value of the dark energy equation-of-state parameter we obtain $w_0=-1.04^{+0.15}_{-0.20}$.

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