arXiv 1006.08772010-06astro-ph.CO

根据近宇宙观测耦合的暗物质-暗能量

Coupled dark matter-dark energy in light of near Universe observations

Laura Lopez Honorez, Beth A. Reid, Olga Mena, Licia Verde, Raul Jimenez

备注：: 34 pages, 6 figures; changes to match published version
发表信息：: JCAP 1009:029,2010
DOI：: 10.1088/1475-7516/2010/09/029

摘要：

基于现有观测的宇宙学分析无法排除暗能量和暗物质流体之间存在相当大的耦合。我们在低红移和近宇宙观测的基础上，探索了满足宇宙微波背景约束的各种耦合暗物质-暗能量模型。我们说明了不同类别的暗耦合模型的现象学，特别注意区分只出现在膨胀历史和那些出现在增长的结构之间的影响。我们发现，虽然一大类暗耦合模型是有效的模型，其中广义相对论（GR）被修改-因此可以通过对膨胀历史和结构增长的组合测试来探测-，但有一类暗耦合模型，其中重力仍然是GR，但扰动的增长原则上是修改的。虽然这种影响是小的，在我们所考虑的具体模型，应该记住，重建的膨胀历史和增长之间的不一致可能不唯一地表明偏离GR。我们的低红移的限制来自宇宙速度，红移空间扭曲和星系空隙中的暗物质丰度。我们发现，目前的数据约束的无量纲耦合|xi| <0.2，但从即将到来的数据的前景是一个显着的改善。未来，对哈勃常数的精确测量，结合对结构生长的高精度限制，可以提供排除暗耦合模型的关键，这些模型可以通过其他测试。我们还将利用弱等价原理违反的论点，这有可能高度不利于一个广泛的家庭的耦合模型。

英文摘要：

Cosmological analysis based on currently available observations are unable to rule out a sizeable coupling among the dark energy and dark matter fluids. We explore a variety of coupled dark matter-dark energy models, which satisfy cosmic microwave background constraints, in light of low redshift and near universe observations. We illustrate the phenomenology of different classes of dark coupling models, paying particular attention in distinguishing between effects that appear only on the expansion history and those that appear in the growth of structure. We find that while a broad class of dark coupling models are effectively models where general relativity (GR) is modified --and thus can be probed by a combination of tests for the expansion history and the growth of structure--, there is a class of dark coupling models where gravity is still GR, but the growth of perturbations is, in principle modified. While this effect is small in the specific models we have considered, one should bear in mind that an inconsistency between reconstructed expansion history and growth may not uniquely indicate deviations from GR. Our low redshift constraints arise from cosmic velocities, redshift space distortions and dark matter abundance in galaxy voids. We find that current data constrain the dimensionless coupling to be |xi|<0.2, but prospects from forthcoming data are for a significant improvement. Future, precise measurements of the Hubble constant, combined with high-precision constraints on the growth of structure, could provide the key to rule out dark coupling models which survive other tests. We shall exploit as well weak equivalence principle violation arguments, which have the potential to highly disfavour a broad family of coupled models.

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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