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  • 1804.08639

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  • PRD22

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Primordial black hole formation during slow reheating after inflation

Research output: Contribution to journalJournal article

Article number123535
<mark>Journal publication date</mark>26/06/2018
<mark>Journal</mark>Physical Review D – Particles and Fields
Number of pages7
Publication statusPublished
Original languageEnglish


We study the formation of primordial black holes (PBHs) in the early Universe during a period of slow reheating after inflation. We demonstrate how the PBH formation mechanism may change even before the end of the matter-dominated phase and calculate the expected PBH mass function. We find that there is a threshold for the variance of the density contrast, σ_c ≃ 0.05, below which the transition occurs even before reheating, with this having important consequences for the PBH mass function. We also show that there is a maximum cutoff for the PBH mass at around 100 M⊙, below which the subdominant radiation bath affects PBH production, making the scenario particularly interesting for the recent LIGO observations of black hole mergers.