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arXiv 1406.4145astro-ph.COhep-ph
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耦合暗物质的宇宙微波背景约束

Cosmic microwave background constraints on coupled dark matter

Sophie C. F. Morris, Anne M. Green

摘要:

我们研究了宇宙学常数和一小部分暗物质与无质量标量场非最小耦合模型的CMB约束。在这种情况下,存在一种额外的类似引力的第五种力,它可以影响宇宙的演化,足以对宇宙学参数的测量产生明显的影响。利用普朗克和WMAP偏振数据,我们发现多达一半的暗物质可以耦合。这种耦合也可以比单一种类的冷暗物质与精粹标量场耦合的模型大几倍,因为标量场不扮演暗能量的角色,因此受数据的限制较少。

英文摘要:

We study CMB constraints on a model with a cosmological constant and a fraction of dark matter non-minimally coupled to a massless scalar field. In this scenario, there is an extra gravity-like fifth force which can affect the evolution of the Universe enough to have a discernible effect on measurements of cosmological parameters. Using Planck and WMAP polarisation data, we find that up to half of the dark matter can be coupled. The coupling can also be several times larger than in models with a single species of cold dark matter coupled to a quintessence scalar field, as the scalar field does not play the role of dark energy and is therefore less constrained by the data.

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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