Baryogenesis through Asymmetric Hawking Radiation from Primordial Black Holes as Dark Matter

Abstract

We examine the extent to which primordial black holes (PBHs) can constitute the observed dark matter while also giving rise to the measured matter-antimatter asymmetry and account for the observed baryon abundance through asymmetric Hawking radiation generated by a derivative coupling of curvature to the baryon-lepton current. We consider both broad and monochromatic mass spectra for this purpose. For the monochromatic spectrum we find that the correct dark matter and baryon energy densities are recovered for peak masses of the spectrum of $M_{\mathrm{pk}}\ge 10^{12}$ kg whereas for the broad case the observed energy densities can be reproduced regardless of peak mass. Adopting some simplifications for the early-time expansion history as a first approximation, we also find that the measured baryon asymmetry can be recovered within an order of magnitude. We argue furthermore that the correct value of the baryon-lepton yield can in principle be retrieved for scenarios where a significant amount of the radiation is produced by PBH decay during or after reheating, as is expected when the decaying PBHs also cause reheating, or when an early matter-dominated phase is considered. We conclude from this first analysis that the model merits further investigation.

26 pages, 6 figures, 2 tables

References in corpus (8)

• Primordial Black Holes as Dark Matter
• On Effective Degrees of Freedom in the Early Universe
• Primordial nucleosynthesis
• Baryogenesis from Hawking Radiation
• Dark Energy and Cosmic Sound: w(z) Surveys with the Gemini/Subaru Wide-Field Multi-Object Spectrograph
• Measuring the baryon content of the universe: BBN vs CMB
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Cited by in corpus (8)

• Dark matter effect on the weak deflection angle by black holes at the center of Milky Way and M87 galaxies
• Evaporation of Primordial Black Holes in the Early Universe: Mass and Spin Distributions
• Primordial black holes from null energy condition violation during inflation
• Gravitational Baryogenesis and Dark Matter from Light Black Holes
• Cosmology in Minkowski space
• Capture of primordial black holes in extrasolar systems
• Revisiting primordial black holes formation from preheating instabilities: the case of Starobinsky inflation
• Asymmetric baryon capture by primordial black holes and baryon asymmetry of the universe