CMB spectral distortions from black holes formed by vacuum bubbles

Heling Deng, Alexander Vilenkin, Masaki Yamada

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Vacuum bubbles may nucleate and expand during the cosmic inflation. When inflation ends, the bubbles run into the ambient plasma, producing strong shocks followed by underdensity waves, which propagate outwards. The bubbles themselves eventually form black holes with a wide distribution of masses. It has been recently suggested that such black holes may account for LIGO observations and may provide seeds for supermassive black holes observed at galactic centers. They may also provide a significant part or even the whole of the dark matter. We estimate the spectral μ-distortion of the CMB induced by expanding shocks and underdensities. The predicted distortions averaged over the sky are well below the current bounds, but localized peaks due to the largest black holes impose constraints on the model parameters.

Original languageEnglish
Article number059
JournalJournal of Cosmology and Astroparticle Physics
Issue number7
Publication statusPublished - 2018 Jul 26


  • CMBR theory
  • Primordial black holes
  • cosmological phase transitions
  • massive black holes


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