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arXiv 2004.04395astro-ph.CO
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作为宇宙学常数探针的周转密度

Turnaround density as a probe of the cosmological constant

Vasiliki Pavlidou, Giorgos Korkidis, Theodore Tomaras, Dimitrios Tanoglidis

摘要:

球面坍缩预言,一个单一的转向密度值(一个结构从哈勃流中分离出来的尺度内的平均物质密度)表征了所有红移相同的宇宙结构。最近Korkidis等人的研究表明,在N体模拟中发现的复杂非球形星系团中,这一特征仍然存在。在这里,我们表明,低红移演变的周转密度约束的宇宙学参数,它可以用来推导出一个本地的约束$Ω_Λ$单独,独立于$Ω_m$。因此,周转密度为利用即将到来的大型宇宙学数据集提供了一种有前途的新方法。

英文摘要:

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.

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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