arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1703.08293astro-ph.CO
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用最新观测探测暗能量动力学

Probing dynamics of dark energy with latest observations

Yuecheng Zhang, Hanyu Zhang, Dandan Wang, Yanghan Qi, Yuting Wang, Gong-Bo Zhao

摘要:

我们检验了$Λ$ CDM模型的有效性,并利用最新的天文观测资料对暗能量的动力学进行了探索。使用$Om(z)$诊断,我们发现不同类型的观测数据在$Λ$ CDM框架内处于紧张状态。然后,我们允许暗能量的动力学和调查的约束暗能量参数。我们发现,对于两种不同类型的状态方程参数$w$的参数化,目前的数据的组合温和地有利于一个不断发展的$w$,虽然意义是不够的贝叶斯证据支持。DESI调查的预测表明,暗能量的动力学可以检测到在$7σ$的置信水平,并将决定性地支持贝叶斯证据,如果最佳拟合模型的$w$来自当前的数据是真正的模型。

英文摘要:

We examine the validity of the $Λ$CDM model, and probe for the dynamics of dark energy using latest astronomical observations. Using the $Om(z)$ diagnosis, we find that different kinds of observational data are in tension within the $Λ$CDM framework. We then allow for dynamics of dark energy and investigate the constraint on dark energy parameters. We find that for two different kinds of parametrisations of the equation of state parameter $w$, a combination of current data mildly favours an evolving $w$, although the significance is not sufficient for it to be supported by the Bayesian evidence. A forecast of the DESI survey shows that the dynamics of dark energy could be detected at $7σ$ confidence level, and will be decisively supported by the Bayesian evidence, if the best fit model of $w$ derived from current data is the true model.

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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