Value of H(0) in the inhomogeneous universe.
Value of H(0) in the inhomogeneous universe.
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DOI：
10.1103/physrevlett.112.221301
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发表时间：
2014-01
影响因子：
8.6
通讯作者：
I. Ben-Dayan;R. Durrer;G. Marozzi;D. Schwarz
中科院分区：
文献类型：
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作者：
I. Ben-Dayan;R. Durrer;G. Marozzi;D. Schwarz
哈勃膨胀率的局部测量受到星系团或空洞等结构的影响。在这里，我们提出了一个完全相对论治疗这种效果，研究如何集群修改的平均距离（模）红移关系和它的分散在一个标准的冷暗物质宇宙的宇宙学常数。局部膨胀率的最佳估计来自于小红移（0.01<z<0.1）的超新星观测。将这些局部测量值与宇宙微波背景各向异性数据的全局拟合进行比较是有趣的。特别是，我们认为宇宙方差（即，局部结构的影响）与当前观测误差的数量级相同，在对哈勃膨胀率进行局部测量时必须考虑在内。
Local measurements of the Hubble expansion rate are affected by structures like galaxy clusters or voids. Here we present a fully relativistic treatment of this effect, studying how clustering modifies the mean distance- (modulus-)redshift relation and its dispersion in a standard cold dark matter universe with a cosmological constant. The best estimates of the local expansion rate stem from supernova observations at small redshifts (0.01<z<0.1). It is interesting to compare these local measurements with global fits to data from cosmic microwave background anisotropies. In particular, we argue that cosmic variance (i.e., the effects of the local structure) is of the same order of magnitude as the current observational errors and must be taken into account in local measurements of the Hubble expansion rate.