Primordial Black Hole Baryogenesis

Abstract

We reconsider the possibility that the observed baryon asymmetry was generated by the evaporation of primordial black holes that dominated the early universe. We present a simple derivation showing that the baryon asymmetry is insensitive to the initial black hole density and the cosmological model but is sensitive to the temperature-dependence of the CP and baryon-violating (or lepton-violating) interactions. We also consider the possibility that black holes stop evaporating and form Planck-mass remnants that act as dark matter. We show that primordial black holes cannot simultaneously account for both the observed baryon asymmetry and the (remnant) dark matter density unless the magnitude of CP violation is much greater than expected from most particle physics models. Finally, we apply these results to ekpyrotic/cyclic models, in which primordial black holes may form when branes collide. We find that obtaining the observed baryon asymmetry is compatible with the other known constraints on parameters.

19 pages, 5 figures

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• Primordial black hole constraints with Hawking radiation -- a review
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• Non-thermal Origin of Asymmetric Dark Matter from Inflaton and Primordial Black Holes
• The Primordial Black Holes that Disappeared: Connections to Dark Matter and MHz-GHz Gravitational Waves
• Ultralight Black Holes as Sources of High-Energy Particles
• Cogenesis of Baryon Asymmetry and Gravitational Dark Matter from Primordial Black Holes
• Gravitational wave hints black hole remnants as dark matter
• Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves
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• Induced gravitational waves and baryon asymmetry fluctuations from primordial black hole formation
• Baryogenesis from ultra-slow-roll inflation
• Gravitational Dark Matter and Primordial Black Holes
• Dark sector production and baryogenesis from not quite black holes
• Non-thermal WIMPy Baryogenesis with Primordial Black Hole
• B $-$ L genesis by sliding inflaton
• Neutrino Emission and Plasma Heating from Primordial Black Holes: An Improved Approach to $N_{\mathrm{eff}}$ Constraints
• Naturalness in Soft Leptogenesis and Gravitino Mass Bound due to Primordial Black Holes