arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1609.02245gr-qc
收藏

暴胀微扰直接坍缩形成的超大质量黑洞

Supermassive black holes formed by direct collapse of inflationary perturbations

Tomohiro Nakama, Teruaki Suyama, Jun'ichi Yokoyama

摘要:

我们提出了一种机制,产生一种新型的原始扰动坍缩的原始黑洞,其质量可以大到必要的,他们成长为超大质量黑洞观察高红移,不矛盾的COBE/FIRAS上限宇宙微波背景(CMB)的光谱失真。在我们的模型中,可观测宇宙由两类许多小斑块组成,它们在暴胀期间经历了不同的膨胀历史。原始扰动大到足以形成原始黑洞的斑块上实现了比其他人经历更多的哈勃膨胀。通过使这些补丁的次要组成部分,超大质量黑洞的罕见性可以解释。另一方面,宇宙的大部分区域经历了标准的历史,因此,只有标准的几乎尺度不变的绝热扰动被CMB或宇宙的大尺度结构的观测所证实。因此,我们的机制可以逃避约束,从未检测到的CMB失真设置的COBE/FIRAS测量。我们的模型预测了超大质量黑洞的存在,即使在红移比观察到的高得多的情况下。因此,我们的模型可以通过未来观测到更高红移的宇宙来测试。

英文摘要:

We propose a mechanism of producing a new type of primordial perturbations that collapse to primordial black holes whose mass can be as large as necessary for them to grow to the supermassive black holes observed at high redshifts, without contradicting COBE/FIRAS upper limits on cosmic microwave background (CMB) spectral distortions. In our model, the observable Universe consists of two kinds of many small patches which experienced different expansion histories during inflation. Primordial perturbations large enough to form primordial black holes are realized on patches that experienced more Hubble expansion than the others. By making these patches the minor component, the rarity of supermassive black holes can be explained. On the other hand, most regions of the Universe experienced the standard history and, hence, only have standard almost-scale-invariant adiabatic perturbations confirmed by observations of CMB or large-scale structures of the Universe. Thus, our mechanism can evade the constraint from the nondetection of the CMB distortion set by the COBE/FIRAS measurement. Our model predicts the existence of supermassive black holes even at redshifts much higher than those observed. Hence, our model can be tested by future observations peeking into the higher-redshift Universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑