Cosmological implications of primordial black holes
Cosmological implications of primordial black holes
复制标题
原初黑洞的宇宙学意义
DOI：
10.1088/1475-7516/2017/10/052
复制
发表时间：
2017
影响因子：
6.4
通讯作者：
L. Verde
中科院分区：
文献类型：
--
作者：
J. Luis Bernal;N. Bellomo;A. Raccanelli;L. Verde
在LIGO探测到一个~ 30 M⊙双黑洞并合后，有关暗物质的一部分可能由原始黑洞（PBHs）组成的可能性已经得到了认真的重新考虑。尽管对该模型有浓厚的兴趣，但缺乏对可能的宇宙学含义和对宇宙学参数推断的影响的研究。我们利用宇宙微波背景观测研究了与其他标准宇宙学参数的相关性，发现了显著的简并，特别是与辐射阻力下原始功率谱和声视界的倾斜有关。然而，这些简并可以大大减少与小尺度极化数据的包含。我们还探讨了作为暗物质的PBH在标准ΛCDM宇宙学模型的简单扩展中是否会引起额外的简并，特别是在附加参数和PBH的参数之间。最后，我们提出了宇宙微波背景对PBH中暗物质比例的约束，不仅适用于单色PBH质量分布，也适用于常见的扩展质量分布。我们的结果表明，扩展质量分布的约束更为严格，但也有相当大的约束力来自于高极化数据。此外，我们根据PBH质量分数的相应约束约束了这种质量分布的形状。
The possibility that a relevant fraction of the dark matter might be comprised of Primordial Black Holes (PBHs) has been seriously reconsidered after LIGO's detection of a ∼ 30 M⊙ binary black holes merger. Despite the strong interest in the model, there is a lack of studies on possible cosmological implications and effects on cosmological parameters inference. We investigate correlations with the other standard cosmological parameters using cosmic microwave background observations, finding significant degeneracies, especially with the tilt of the primordial power spectrum and the sound horizon at radiation drag. However, these degeneracies can be greatly reduced with the inclusion of small scale polarization data. We also explore if PBHs as dark matter in simple extensions of the standard ΛCDM cosmological model induces extra degeneracies, especially between the additional parameters and the PBH's ones. Finally, we present cosmic microwave background constraints on the fraction of dark matter in PBHs, not only for monochromatic PBH mass distributions but also for popular extended mass distributions. Our results show that extended mass distribution's constraints are tighter, but also that a considerable amount of constraining power comes from the high-ℓ polarization data. Moreover, we constrain the shape of such mass distributions in terms of the correspondent constraints on the PBH mass fraction.
DOI：
10.17863/cam.43425
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Aghanim N
通讯作者：
Aghanim N