Cosmic strings and primordial black holes

Cosmic strings and primordial black holes
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宇宙弦和原初黑洞

DOI:
10.1088/1475-7516/2018/11/008
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发表时间:
2018
影响因子:
6.4
通讯作者:
Gruzinov, Andrei
Gruzinov, Andrei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Vilenkin, Alexander;Levin, Yuri;Gruzinov, Andrei

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宇宙弦和原始黑洞(PBHs)通常在描述早期宇宙的许多场景中自然形成。在这里,我们展示了如果宇宙弦和pbh都存在,它们的相互作用会导致一系列有趣的结果。在它们形成的时候,pbh附着在弦上并影响它们的演化,导致黑洞弦网络的形成,并且通常会在一定范围内抑制环路的产生。随后,网络内部的重新连接产生了由几个黑洞和连接线组成的小网络。网络中黑洞的数量以及网络的稳定性取决于弦的拓扑性质。由于引力波的发射,这些网呈指数级振荡和收缩。这可能导致可观察到的弦驱动pbh合并。弦可以使pbh远离星系晕,使得目前的pbh界限不能普遍适用。或者,重pbh可以将低张力弦拖到星系中心。超导弦可以表现为指向超大质量黑洞的射电细丝。
Cosmic strings and primordial black holes (PBHs) commonly and naturally form in many scenarios describing the early universe. Here we show that if both cosmic strings and PBHs are present, their interaction leads to a range of interesting consequences. At the time of their formation, the PBHs get attached to the strings and influence their evolution, leading to the formation of black-hole-string networks and commonly to the suppression of loop production in a range of redshifts. Subsequently, reconnections within the network give rise to small nets made of several black holes and connecting strings. The number of black holes in the network as well as the stability of the nets depend on the topological properties of the strings. The nets oscillate and shrink exponentially due to the emission of gravitational waves. This leads to potentially observable string-driven mergers of PBHs. The strings can keep PBHs from galactic halos, making the current bounds on PBHs not generally applicable. Alternatively, heavy PBHs can drag low-tension strings into the centers of galaxies. The superconducting strings can appear as radio filaments pointing towards supermassive black holes.
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