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arXiv 1801.09658astro-ph.COgr-qchep-phhep-th
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从暗物质中涌现出的暗能量

Emergent Dark Energy from Dark Matter

Takeshi Kobayashi, Pedro G. Ferreira

摘要:

研究了多峰多谷势场中标量场的宇宙动力学。我们表明标量场的动力学将从轻暗物质样行为(如轻轴子的行为)演变为重暗物质样和暗能量样行为的组合。我们讨论了这样一个模型的现象,解释它如何能引起的宇宙学常数,以及它如何能去耦的黑暗部门之间的时间重组和今天的密度,均匀的背景和扰动。暗物质的最终形式是类轴子,但其丰度和原始等曲率模式与传统的轴子暗物质具有非常不同的值。

英文摘要:

We consider the cosmological dynamics of a scalar field in a potential with multiple troughs and peaks. We show that the dynamics of the scalar field will evolve from light dark matter-like behaviour (such as that of a light axion) to a combination of heavy dark matter-like and dark energy-like behaviour. We discuss the phenomenology of such a model, explaining how it can give rise to the cosmological constant, as well as how it can decouple the dark sector densities between the time of recombination and today, for both the homogeneous background and perturbations. The final form of the dark matter is axion-like, but with abundance and primordial isocurvature modes taking very different values from traditional, axionic, dark matter.

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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