MISC

2019年9月10日

Clustering of primordial black holes formed in a matter-dominated epoch

  • Takahiko Matsubara
  • ,
  • Takahiro Terada
  • ,
  • Kazunori Kohri
  • ,
  • Shuichiro Yokoyama

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In the presence of the local-type primordial non-Gaussianity, it is known<br />
that the clustering of primordial black holes (PBHs) emerges even on<br />
super-horizon scales at the formation time. This effect has been investigated<br />
in the high-peak limit of the PBH formation in the radiation-dominated epoch in<br />
the literature. There is another possibility that the PBH formation takes place<br />
in the early matter-dominated epoch. In this scenario, the high-peak limit is<br />
not applicable because even initially small perturbations grow and can become a<br />
PBH. We first derive a general formula to estimate the clustering of PBHs with<br />
primordial non-Gaussianity without assuming the high-peak limit, and then apply<br />
this formula to a model of PBH formation in a matter-dominated epoch.<br />
Clustering is less significant in the case of the PBH formation in the<br />
matter-dominated epoch than that in the radiation-dominated epoch.<br />
Nevertheless, it is much larger than the Poisson shot noise in many cases.<br />
Relations to the constraints of the isocurvature perturbations by the cosmic<br />
microwave background radiation are quantitatively discussed.

リンク情報
arXiv
http://arxiv.org/abs/arXiv:1909.04053
URL
http://arxiv.org/abs/1909.04053v2
ID情報
  • arXiv ID : arXiv:1909.04053

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