论文标题
周转密度作为宇宙常数的探测
Turnaround density as a probe of the cosmological constant
论文作者
论文摘要
球形塌陷预测，周转密度的单个值（在哈勃流中脱离的规模内的平均物质密度）表征了同一红移处的所有宇宙结构。 Korkidis等人最近显示了它。该特征持续存在于在N体模拟中鉴定出的复杂的非球形星系簇。在这里，我们表明，周转密度的低降距演变会限制宇宙学参数，并且可以单独使用$ω_λ$来得出局部约束，独立于$ω_m$。因此，周转密度为利用即将到来的大型宇宙数据集提供了一种有希望的新方法。
Spherical collapse predicts that a single value of the turnaround density (average matter density within the scale on which a structure detaches from the Hubble flow) characterizes all cosmic structures at the same redshift. It has been recently shown by Korkidis et al. that this feature persists in complex non-spherical galaxy clusters identified in N-body simulations. Here we show that the low-redshift evolution of the turnaround density constrains the cosmological parameters, and that it can be used to derive a local constraint on $Ω_Λ$ alone, independent of $Ω_m$. The turnaround density thus provides a promising new way to exploit upcoming large cosmological datasets.
