CMB and BBN constraints on evaporating primordial black holes revisited

We derive new CMB anisotropy power spectrum and BBN constraints for evaporating primordial black holes with mass between 1011 g and 1016 g by explicitly solving the electromagnetic particle cascades of emitted particles and the deposition of this emitted energy to the background baryon-photon plasma...

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Published inJournal of cosmology and astroparticle physics Vol. 2020; no. 6; p. 18
Main Authors Acharya, Sandeep Kumar, Khatri, Rishi
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.06.2020
Subjects
Anisotropy
Black holes
Constraints
Deuterium
Helium
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Summary:We derive new CMB anisotropy power spectrum and BBN constraints for evaporating primordial black holes with mass between 1011 g and 1016 g by explicitly solving the electromagnetic particle cascades of emitted particles and the deposition of this emitted energy to the background baryon-photon plasma. We show that the CMB anisotropies can provide stronger constraints compared to BBN and CMB spectral distortions on black holes with masses as small as MBH=1.1×1013 g, a slightly smaller mass than what has been considered in literature until now. We also show that, with more up-to-date data on abundances of deuterium and helium-3, BBN constraints are strengthened significantly. The abundance of these primordial black holes constrains the epoch of inflation 0∼4 e-folds after the epoch constrained by the CMB observations.
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2020/06/018