Primordial black hole formation during slow reheating after inflation

Carr, Bernard and Dimopoulos, Konstantinos and Owen, Charlotte and Tenkanen, Tommi (2018) Primordial black hole formation during slow reheating after inflation. Physical Review D – Particles and Fields, 97. ISSN 2470-0010

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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.

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Journal Article
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Physical Review D – Particles and Fields
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04 Jul 2018 08:00
Last Modified:
06 Sep 2022 00:13