Primordial black hole formation by vacuum bubbles

@article{Deng2017PrimordialBH,
  title={Primordial black hole formation by vacuum bubbles},
  author={Heling Deng and Alexander Vilenkin},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2017},
  volume={2017},
  pages={044 - 044}
}
Vacuum bubbles may nucleate during the inflationary epoch and expand, reaching relativistic speeds. After inflation ends, the bubbles are quickly slowed down, transferring their momentum to a shock wave that propagates outwards in the radiation background. The ultimate fate of the bubble depends on its size. Bubbles smaller than certain critical size collapse to ordinary black holes, while in the supercritical case the bubble interior inflates, forming a baby universe, which is connected to the… 

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