Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio
Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio
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DOI：
10.1103/physrevd.96.104039
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发表时间：
2017-08
影响因子：
5
通讯作者：
K. Aoki;S. Mukohyama
中科院分区：
文献类型：
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作者：
K. Aoki;S. Mukohyama
我们提出了一种场景，可以自然地解释在变色龙场的双计量理论背景下观察到的暗物质-重子比率。我们引入了两个额外的引力自由度，即大质量引力子和变色龙场，分别对应于暗物质和暗能量。通过引力子质量项，假设变色龙场与暗物质（即大质量引力子）非最小耦合。我们发现，由于变色龙场的能量转移，暗物质与重子的比率会动态调整到观测值。因此，该模型可以独立于暗物质与重子的初始丰度来解释观测到的暗物质与重子的比率。
We propose a scenario that can naturally explain the observed dark matter-baryon ratio in the context of bimetric theory with a chameleon field. We introduce two additional gravitational degrees of freedom, the massive graviton and the chameleon field, corresponding to dark matter and dark energy, respectively. The chameleon field is assumed to be non-minimally coupled to dark matter, i.e., the massive graviton, through the graviton mass terms. We find that the dark matter-baryon ratio is dynamically adjusted to the observed value due to the energy transfer by the chameleon field. As a result, the model can explain the observed dark matter-baryon ratio independently from the initial abundance of them.