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arXiv 1608.07039astro-ph.CO
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耦合暗能量的宇宙学约束

Cosmological constraints on coupled dark energy

Weiqiang Yang, Hang Li, Yabo Wu, Jianbo Lu

摘要:

耦合暗能量模型为缓解宇宙学标准模型的符合问题提供了一条可能的途径。这里,耦合项被假定为$\bar{Q}=3Hξ_x\barρ_x$,它与暗能量的相互作用率和能量密度有关。我们推导了几个耦合模型的背景和扰动演化方程。然后,我们测试这些模型,目前可用的宇宙观测,其中包括宇宙微波背景辐射普朗克2015年,重子声学振荡,Ia型超新星,$fσ_8(z)$数据点从红移空间扭曲,和弱引力透镜。约束结果表明,在2 $σ$水平上没有相互作用的证据,很难区分不同的耦合模型。

英文摘要:

The coupled dark energy model provides a possible approach to mitigate the coincidence problem of cosmological standard model. Here, the coupling term is assumed as $\bar{Q}=3Hξ_x\barρ_x$, which is related to the interaction rate and energy density of dark energy. We derive the background and perturbation evolution equations for several coupled models. Then, we test these models by currently available cosmic observations which include cosmic microwave background radiation from Planck 2015, baryon acoustic oscillation, type Ia supernovae, $fσ_8(z)$ data points from redshift-space distortions, and weak gravitational lensing. The constraint results tell us there is no evidence of interaction at 2$σ$ level, it is very hard to distinguish different coupled models from other ones.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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