Ricci focusing, shearing, and the expansion rate in an almost homogeneous Universe

Ricci focusing, shearing, and the expansion rate in an almost homogeneous Universe
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利玛窦在几乎均匀的宇宙中聚焦、剪切和膨胀率

DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
P. Ferreira
P. Ferreira
中科院分区:
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文献类型:
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作者:
K. Bolejko;P. Ferreira

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宇宙是不均匀的,但它似乎是令人难以置信的良好特征的均匀相对论模型。当前的挑战之一是准确地描述这种模型的属性。在本文中,我们探讨了如何不均匀性可能会影响整体的光学性质的宇宙,量化他们如何可以偏置的红移距离关系,在一些玩具模型,模仿真实的宇宙。我们探索的模型在大尺度上是统计上均匀的。我们发现,不均匀性的影响是百分之几的顺序,这可能是非常重要的宇宙学参数的精确估计。我们讨论了什么教训可以帮助我们解决一个更现实的不均匀的宇宙。
The Universe is inhomogeneous, and yet it seems to be incredibly well-characterised by a homogeneous relativistic model. One of the current challenges is to accurately characterise the properties of such a model. In this paper we explore how inhomogeneities may affect the overall optical properties of the Universe by quantifying how they can bias the redshift-distance relation in a number of toy models that mimic the real Universe. The models that we explore are statistically homogeneous on large scales. We find that the effect of inhomogeneities is of order of a few percent, which can be quite important in precise estimation of cosmological parameters. We discuss what lessons can be learned to help us tackle a more realistic inhomogeneous universe.
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