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Comprehensively Constraining Ultra-Light Primordial Black Holes Through Relic Formation and Early Mergers

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arxiv 2506.16154 v1 pith:RENDJGY2 submitted 2025-06-19 astro-ph.CO

classification astro-ph.CO
keywords pbhsprimordialbinariesblackconstraintsearlyformationfraction
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abstract

We investigate constraints on the least explored, smallest mass scales of primordial black holes (PBHs), which evaporate prior to Big Bang Nucleosynthesis (BBN). Our study examines the impact of Planck-mass relics on the allowed fraction of dark matter composed of PBHs ($f_{PBH}$), as well as on the resulting stochastic gravitational wave background and the formation of primordial binaries. We discuss how these binaries and early mergers lead to longer PBH lifetimes, extending the reach of the stringent BBN constraints to smaller masses than usually expected. We make comprehensive constraint plots on the collapse fraction $\beta$ and $f_{PBH}$ (including relics), focusing on ultra-light PBHs.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Fine-tuning in mixed Dark Matter models with Primordial Black Hole relics

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    In mixed dark matter models combining Planck-mass black hole relics, Hawking-evaporated particles, and a WIMP, freeze-in, or axion component, the total abundance's fine-tuning is dominated by the primordial power spec...

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