Couplings between holographic dark energy and dark matter
Couplings between holographic dark energy and dark matter
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DOI：
10.1140/epjc/s10052-010-1408-1
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
Yin-Zhe Ma;Y. Gong;Xuelei Chen
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文献类型：
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作者：
Yin-Zhe Ma;Y. Gong;Xuelei Chen
我们在全息暗能量的框架下考虑暗物质和暗能量之间的相互作用，并提出了一种自然的和物理上合理的相互作用形式，其中相互作用项与暗物质的功率和暗能量密度的乘积成正比。我们在这样的模型中研究宇宙的演化。耦合对暗物质和暗能量分量的影响可能是不对称的。虽然暗能量在晚些时候从暗物质中分离出来，就像宇宙流体的其他成分随着宇宙膨胀而变得解耦一样，有趣的是，暗物质实际上可能在晚些时候与暗能量耦合。我们将把这种现象称为耦合。我们使用最新的Ia型超新星的数据从SCP团队，重子声学振荡数据从SDSS和2dF调查，和CMB角功率谱的第一个峰值的位置来约束模型。我们发现，与暗能量和暗物质密度的一次幂积成正比的相互作用项与当前数据非常拟合。
We consider the interaction between dark matter and dark energy in the framework of holographic dark energy, and propose a natural and physically plausible form of interaction, in which the interacting term is proportional to the product of the powers of the dark matter and dark energy densities. We investigate the cosmic evolution in such models. The impact of the coupling on the dark matter and dark energy components may be asymmetric. While the dark energy decouples from the dark matter at late time, just as other components of the cosmic fluid become decoupled as the universe expands, interestingly, the dark matter may actually become coupled to the dark energy at late time. We shall call such a phenomenonincoupling. We use the latest type Ia supernovae data from the SCP team, baryon acoustics oscillation data from SDSS and 2dF surveys, and the position of the first peak of the CMB angular power spectrum to constrain the model. We find that the interaction term which is proportional to the first power product of the dark energy and dark matter densities gives an excellent fit to the current data.