The cosmic coincidences of primordial-black-hole dark matter

Abstract

If primordial black holes (PBHs) contribute more than 10 percent of the dark matter (DM) density, their energy density today is of the same order as that of the baryons. Such a cosmic coincidence might hint at a mutual origin for the formation scenario of PBHs and the baryon asymmetry of the Universe. Baryogenesis can be triggered by a sharp transition of the rolling rate of inflaton from slow-roll to (nearly) ultraslow-roll phases that produces large curvature perturbations for PBH formation in single-field inflationary models. We show that the baryogenesis requirement drives the PBH contribution to DM, along with the inferred PBH mass range, the resulting stochastic gravitational wave background frequency window, and the associated cosmic microwave background tensor-to-scalar ratio amplitude, into potentially observable regimes.

7 pages, 3 figures, version matched with publication (Editors' Suggestion)

References in corpus (14)

• Primordial Black Holes as Dark Matter
• Primordial Black Holes as Dark Matter: Recent Developments
• Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events
• Primordial black hole dark matter from single field inflation
• Primordial Black Holes and Slow-Roll Violation
• Cosmological constraints on exotic injection of electromagnetic energy
• Calculating the mass spectrum of primordial black holes
• Single-field inflation, anomalous enhancement of superhorizon fluctuations, and non-Gaussianity in primordial black hole formation
• Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
• The Formation Probability of Primordial Black Holes
• Stochastic inflationary dynamics beyond slow-roll and consequences for primordial black hole formation
• Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis
• On tidal capture of primordial black holes by neutron stars
• Peak statistics for the primordial black hole abundance

Cited by in corpus (5)

• Baryogenesis, Primordial Black Holes and MHz-GHz Gravitational Waves
• Induced gravitational waves from the cosmic coincidence
• Constraints on ultra-slow-roll inflation from the third LIGO-Virgo observing run
• Impact of radiation from primordial black holes on the 21-cm angular-power spectrum in the dark ages
• Correlation length of the angular mode for an approximate $U(1)$ symmetry during inflation