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arXiv 1502.01156astro-ph.CO
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具有宇宙学常数的全息暗能量

Holographic Dark Energy with Cosmological Constant

Yazhou Hu, Miao Li, Nan Li, Zhenhui Zhang

摘要:

受多重宇宙假设的启发,我们研究了一个杂合暗能量模型,该模型由两部分组成,第一部分是宇宙学常数,第二部分是全息暗能量,因此该模型被命名为$Λ$ HDE模型.通过对$Λ$ HDE模型的理论研究,我们发现参数$d$和$Ω_{hde}$被划分为几个区域,在这些区域中宇宙的命运是完全不同的。我们研究这个模型的动力学行为,特别是宇宙的未来演化。利用最近的观测数据对$Λ$ HDE模型中的宇宙学参数进行了拟合分析。我们发现,当受$\rm Planck+SNLS3+BAO+HST$约束时,模型产生$χ^2_{\rm min}=426.27$,与HDE模型(428.20)和协调的$Λ$ CDM模型(431.35)的结果相当。在CL为68.3时,我们得到了$-0.07<Ω_{\Lambda0}<0.68$和相应的$0.04<Ω_{hde0}<0.79$,这意味着目前在$Λ$ HDE模型中,全息暗能量和宇宙学常数分量之间存在着相当大的简并.

英文摘要:

Inspired by the multiverse scenario, we study a heterotic dark energy model in which there are two parts, the first being the cosmological constant and the second being the holographic dark energy, thus this model is named the $Λ$HDE model. By studying the $Λ$HDE model theoretically, we find that the parameters $d$ and $Ω_{hde}$ are divided into a few domains in which the fate of the universe is quite different. We investigate dynamical behaviors of this model, and especially the future evolution of the universe. We perform fitting analysis on the cosmological parameters in the $Λ$HDE model by using the recent observational data. We find the model yields $χ^2_{\rm min}=426.27$ when constrained by $\rm Planck+SNLS3+BAO+HST$, comparable to the results of the HDE model (428.20) and the concordant $Λ$CDM model (431.35). At 68.3\% CL, we obtain $-0.07<Ω_{\Lambda0}<0.68$ and correspondingly $0.04<Ω_{hde0}<0.79$, implying at present there is considerable degeneracy between the holographic dark energy and cosmological constant components in the $Λ$HDE model.

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