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arXiv 1405.1291gr-qchep-th
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暗物质与可变的真空能量相互作用

Dark matter interacts with variable vacuum energy

Iván E. Sánchez G

摘要:

我们研究了一个空间平坦的Friedmann-Robertson-Walker(FRW)方案,其中包含两个相互作用分量,即暗物质和可变真空能量(VVE)密度,以及两个解耦分量,一个是重子项,另一个是辐射项.我们考虑的导数暗分量密度的线性相互作用。我们将$χ^2$方法应用到哈勃观测数据中,对宇宙学参数进行约束,并分析了辐射时代的暗能量。结果表明,我们的模型满足$Ω_{x}(z\simeq 1100)<0.009$在$2σ$水平上的严格约束,这与最近的分析是一致的,包括普朗克巡天的宇宙微波背景各向异性测量,Euclid和CMBPol实验所能实现的未来约束,早期暗能量的行为,并满足大爆炸核合成时期$2σ$水平上的严格$Ω_{x}(z\simeq 10^{10})<0.04$.我们还研究了与老类星体APM 08279+5255相关的高红移宇宙年龄问题,并估计了今天宇宙的年龄。

英文摘要:

We investigate a spatially flat Friedmann-Robertson-Walker (FRW) scenario with two interacting components, dark matter and variable vacuum energy (VVE) densities, plus two decoupled components, one is a baryon term while the other behaves as a radiation component. We consider a linear interaction in the derivative dark component density. We apply the $χ^2$ method to the observational Hubble data for constraining the cosmological parameters and analyze the amount of dark energy in the radiation era for the model. It turns out that our model fulfills the severe bound of $Ω_{x}(z\simeq 1100)<0.009$ at $2σ$ level, so is consistent with the recent analysis that includes cosmic microwave background anisotropy measurements from Planck survey, the future constraints achievable by Euclid and CMBPol experiments, reported for the behavior of the dark energy at early times, and fulfills the stringent bound $Ω_{x}(z\simeq 10^{10})<0.04$ at $2σ$ level in the big-bang nucleosynthesis epoch. We also examine the cosmic age problem at high redshift associated with the old quasar APM 08279+5255 and estimate the age of the universe today.

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