Condensate of Massive Graviton and Dark Matter
Condensate of Massive Graviton and Dark Matter
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巨大引力子和暗物质的凝聚体
DOI：
10.1103/physrevd.97.044002
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Kei-ichi Maeda
中科院分区：
文献类型：
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作者：
Katsuki Aoki;Kei-ichi Maeda
我们在无重影的双引力理论中研究相干振荡的大质量引力子。这种相干场可以解释为大质量引力子的凝聚。我们首先定义弯曲时空中相干大质量引力子的有效能量动量张量。然后，我们研究了宇宙的背景动力学和宇宙结构的形成，包括相干的大质量引力子的影响。我们发现大质量引力子的凝聚体表现为宇宙的暗物质成分。从几何的观点来看，凝聚体被视为时空各向异性。因此，在我们的设想中，暗物质起源于时空的微小变形。我们还讨论了时空各向异性的产生，并发现原始起源的河外磁场可以产生足够的暗物质。
We study coherently oscillating massive gravitons in the ghost-free bigravity theory. This coherent field can be interpreted as a condensate of the massive gravitons. We first define the effective energy-momentum tensor of the coherent massive gravitons in a curved spacetime. We then study the background dynamics of the Universe and the cosmic structure formation including the effects of the coherent massive gravitons. We find that the condensate of the massive graviton behaves as a dark matter component of the Universe. From the geometrical point of view the condensate is regarded as a spacetime anisotropy. Hence, in our scenario, dark matter is originated from the tiny deformation of the spacetime. We also discuss a production of the spacetime anisotropy and find that the extragalactic magnetic field of a primordial origin can yield a sufficient amount for dark matter.