The effect of dark matter and dark energy interactions on the peculiar velocity field and the kinetic Sunyaev-Zel'dovich effect
The effect of dark matter and dark energy interactions on the peculiar velocity field and the kinetic Sunyaev-Zel'dovich effect
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DOI：
10.1088/1475-7516/2013/12/001
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发表时间：
2013-08
影响因子：
6.4
通讯作者：
Xiaodong Xu;Bin Wang;Pengjie Zhang;F. Atrio-Barandela
中科院分区：
文献类型：
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作者：
Xiaodong Xu;Bin Wang;Pengjie Zhang;F. Atrio-Barandela
暗物质和暗能量之间的相互作用被认为是缓解巧合问题的一种机制。我们分析了它对引力场和奇异速度场演化的影响。我们发现，对于不同的模型参数，特有的速度变化从一个因素五倍小到两倍大，在相同的尺度下的ΛCDM宇宙学模型。我们提出了两个新的观测敏感的相互作用的基础上，它们对速度场的影响。我们比较了对奇异速度的影响和对积分Sachs-Wolfe效应的影响，表明速度对相互作用更敏感。我们表明，目前的上限的动力学Sunyaev-Zel'dovich功率谱的温度各向异性的振幅提供了约束的耦合内的黑暗部门是一致的，以前从宇宙微波背景和星系团。特别是，我们表明，阿塔卡玛宇宙望远镜和南极望远镜的数据有利于暗能量衰变为暗物质，需要解决的巧合问题。
The interaction between Dark Matter and Dark Energy has been proposed as a mechanism to alleviate the coincidence problem. We analyze its effects on the evolution of the gravitational and the peculiar velocity fields. We find that for different model parameters peculiar velocities vary from a factor five times smaller to two times larger than in the ΛCDM cosmological model at the same scales. We propose two new observables sensitive to such interactions based on their effect on the velocity field. We compare the effects on peculiar velocities with those on the Integrated Sachs-Wolfe effect demonstrating that velocities are more sensitive to the interaction. We show that the current upper limits on the amplitude of the kinetic Sunyaev-Zel'dovich power spectrum of temperature anisotropies provide constraints on the coupling within the dark sectors that are consistent with those obtained previously from the Cosmic Microwave Background and galaxy clusters. In particular, we show that Atacama Cosmology Telescope and South Pole Telescope data favor the decay of Dark Energy into Dark Matter, as required to solve the coincidence problem.