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arXiv 1407.7364astro-ph.CO
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关于哈勃常数的局部变化

On the local variation of the Hubble constant

Io Odderskov, Steen Hannestad, Troels Haugbølle

摘要:

我们已经仔细研究了如何本地测量的哈勃常数,$H_0$,可以影响各种不同的参数有关的调查几何形状,深度和大小,以及观察者在空间中的位置。我们的研究是基于N体模拟的结构在标准的$Λ$ CDM模型和我们的结论是,在测量的$H_0$的预期方差太小,以解释目前的差异之间的低值的$H_0$推断从测量的宇宙微波背景(CMB)的普朗克合作和直接测量值在本地宇宙中使用Ia型超新星。这一结论是非常可靠的,并且不会随着关于测量几何和有效天空覆盖或观测者在空间中的位置的不同假设而改变。

英文摘要:

We have carefully studied how local measurements of the Hubble constant, $H_0$, can be influenced by a variety of different parameters related to survey geometry, depth, and size, as well as observer position in space. Our study is based on N-body simulations of structure in the standard $Λ$CDM model and our conclusion is that the expected variance in measurements of $H_0$ is far too small to explain the current discrepancy between the low value of $H_0$ inferred from measurements of the cosmic microwave background (CMB) by the Planck collaboration and the value measured directly in the local universe by use of Type Ia supernovae. This conclusion is very robust and does not change with different assumptions about survey geometry and effective sky coverage or observer position in space.

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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