超轻玻色子暗物质与宇宙微波背景
Ultra light bosonic dark matter and cosmic microwave background
摘要：
在本文中，我们考虑的假设中，一种超轻玻色暗物质（ULBDM）的质量$m_{B}\sim 10^{-22}$ eV的可能是宇宙中的主导暗物质（DM）。作为第一种方法，我们在动力学理论的背景下工作，其中ULBDM由相空间分布函数描述，其动力学由玻尔兹曼-爱因斯坦方程决定。我们研究了这种暗物质在宇宙微波背景的声峰中的影响。我们发现，玻色-爱因斯坦统计的影响是小的，虽然可察觉的，相当于非相对论性物质的增加。强调的是，在这种方法中，ULBDM是一个合理的DM候选人所需的质量温度比约为五个数量级。我们表明，再电离也是必要的，我们解决了这个模型的一系列一致的值。我们发现ULBDM的温度低于临界值，暗示玻色-爱因斯坦凝聚是ULBDM范式所固有的。
英文摘要：
In this paper, we consider the hypothesis in which a species of ultra light bosonic dark matter (ULBDM) with mass $m_{B}\sim 10^{-22}$ eV could be the dominant dark matter (DM) in the Universe. As a first approach we work in the context of kinetic theory, where ULBDM is described by the phase space distribution function whose dynamics is dictated by the Boltzmann-Einstein equations. We investigate the effects that this kind of dark matter imprints in the acoustic peaks of the cosmic microwave background. We find that the effect of the Bose-Einstein statistics is small, albeit perceptible, and is equivalent to an increase of non-relativistic matter. It is stressed that in this approach, the mass-to-temperature ratio necessary for ULBDM to be a plausible DM candidate is about five orders of magnitude. We show that reionization is also necessary and we address a range of consistent values for this model. We find that the temperature of ULBDM is below the critical value, impliying that Bose-Einstein condensation is inherent to the ULBDM paradigm.
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