Testing models of vacuum energy interacting with cold dark matter
Testing models of vacuum energy interacting with cold dark matter
复制标题
真空能量与冷暗物质相互作用的测试模型
DOI：
10.1103/physrevd.93.023002
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发表时间：
2016-01-12
影响因子：
5
通讯作者：
Zhang, Xin
中科院分区：
文献类型：
--
作者：
Li, Yun-He;Zhang, Jing-Fei;Zhang, Xin
我们测试了真空能量与冷暗物质相互作用的模型，并尝试使用当前的观测来探讨与 $\Lambda$CDM 模型可能存在的偏差。我们关注两个特定模型，$Q=3\beta H\rho_{\Lambda}$ 和 $Q=3\beta H\rho_c$。数据组合来自普朗克2013数据、重子声振荡测量数据、Ia型超新星数据、哈勃常数测量数据、红移空间扭曲数据和星系弱透镜数据。对于$Q=3\beta H\rho_c$模型，我们发现它可以受到所有数据组合的严格约束，而对于$Q=3\beta H\rho_{\Lambda}$模型，参数之间仍然存在显着的简并性。耦合常数的最严格约束是 $1\sigma$ 级别的 $\beta=-0.026^{+0.036}_{-0.053}$ （对于 $Q=3\beta H\rho_{\Lambda}$）和 $\beta=-0.00045\pm0.00069$ （对于 $Q=3\beta H\rho_c$）。对于所有拟合结果，我们发现空交互$\beta=0$始终与数据一致。我们的工作完成了最近普朗克 2015 年论文中关于相互作用暗能量模型的讨论。考虑到这项工作与普朗克 2015 年的结果，从可能的相互作用的角度来看，没有证据表明模型超出了标准 $\Lambda$CDM 模型。
We test the models of vacuum energy interacting with cold dark matter and try to probe the possible deviation from the $\Lambda$CDM model using current observations. We focus on two specific models, $Q=3\beta H\rho_{\Lambda}$ and $Q=3\beta H\rho_c$. The data combinations come from the Planck 2013 data, the baryon acoustic oscillations measurements, the type-Ia supernovae data, the Hubble constant measurement, the redshift space distortions data and the galaxy weak lensing data. For the $Q=3\beta H\rho_c$ model, we find that it can be tightly constrained by all the data combinations, while for the $Q=3\beta H\rho_{\Lambda}$ model, there still exist significant degeneracies between parameters. The tightest constraints for the coupling constant are $\beta=-0.026^{+0.036}_{-0.053}$ (for $Q=3\beta H\rho_{\Lambda}$) and $\beta=-0.00045\pm0.00069$ (for $Q=3\beta H\rho_c$) at the $1\sigma$ level. For all the fit results, we find that the null interaction $\beta=0$ is always consistent with data. Our work completes the discussion on the interacting dark energy model in the recent Planck 2015 papers. Considering this work together with the Planck 2015 results, it is believed that there is no evidence for the models beyond the standard $\Lambda$CDM model from the point of view of possible interaction.