对早期和受压暗能量模型的当前限制和未来21 cm前景
Current constraints on early and stressed dark energy models and future 21 cm perspectives
摘要：
尽管目前的宇宙学测量取得了很大的进展，但宇宙的主要组成部分，即创造的暗能量的性质仍然是一个悬而未决的问题。早期的暗能量是一个可能的候选者，它也可能减轻标准范式的一些微调问题。利用最新的宇宙学数据，我们发现早期暗能量密度参数的95%CL上限为$Ω_{\textrm{eDE}}$。另一方面，暗能量成分可能是受应力的和不均匀的流体。如果是这种情况，则有效声速和粘度参数不受当前数据的约束。未来的Omniscope-like $21$ cm调查，结合目前的CMB数据，可以区分标准的精华场景与其他可能的模型与$2σ$意义，假设一个不可忽略的早期暗能量的贡献。这些$21$ cm探头的$Ω_{\textrm{eDE}}$参数达到的精度可能低于$\mathcal{O} (10\%)$。
英文摘要：
Despite the great progress of current cosmological measurements, the nature of the dominant component of the universe, coined dark energy, is still an open question. Early Dark Energy is a possible candidate which may also alleviate some fine tuning issues of the standard paradigm. Using the latest available cosmological data, we find that the 95% CL upper bound on the early dark energy density parameter is $Ω_{\textrm{eDE}}$. On the other hand, the dark energy component may be a stressed and inhomogeneous fluid. If this is the case, the effective sound speed and the viscosity parameters are unconstrained by current data. Future omniscope-like $21$cm surveys, combined with present CMB data, could be able to distinguish between standard quintessence scenarios from other possible models with $2σ$ significance, assuming a non-negligible early dark energy contribution. The precision achieved on the $Ω_{\textrm{eDE}}$ parameter from these $21$ cm probes could be below $\mathcal{O} (10\%)$.
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