On de Sitter Geometry in Cosmic Void Statistics

On de Sitter Geometry in Cosmic Void Statistics
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论宇宙空洞统计中的德西特几何

DOI:
10.1093/mnras/stt2298
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发表时间:
2014
影响因子:
4.8
通讯作者:
鄭昇明
鄭昇明
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gibbons;G. W.;Werner;M. C.;吉田直紀;鄭昇明

文献摘要

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从欧几里得3-空间中四维德西特球体配置的几何概念出发,并将宇宙中的空隙建模为球体,我们证明,该配置空间上的均匀分布意味着空隙数密度的幂律,这与结果一致。对于中等范围的空隙体积,偏移集形式主义和数据。也可以估计大尺度结构的尺度维数。我们还讨论了限制测量几何形状对空隙统计的影响。这项工作是德西特几何在宇宙学中的一个新的应用,也为宇宙学中的自相似性提供了一个新的几何视角。
Starting from the geometrical concept of a four-dimensional de Sitter configuration of spheres in Euclidean 3-space and modelling voids in the Universe as spheres, we show that a uniform distribution over this configuration space implies a power law for the void number density which is consistent with results from the excursion set formalism and with data, for an intermediate range of void volumes. The scaling dimension of the large-scale structure can be estimated as well. We also discuss the effect of restricting the survey geometry on the void statistics. This work is a new application of de Sitter geometry to cosmology and also provides a new geometrical perspective on self-similarity in cosmology.