Assessing the tension between a black hole dominated early universe and leptogenesis

Abstract

We perform the first numerical calculation of the interplay between thermal and black hole induced leptogenesis, demonstrating that the right-handed neutrino surplus produced during the evaporation only partially mitigates the entropy dilution suffered by the thermal component. As such, the intermediate-mass regime of the right-handed neutrinos, $10^6\mathrm{GeV}\lesssim M_N\lesssim 10^9\mathrm{GeV}$, could not explain the observed baryon asymmetry even for fine-tuned scenarios if there existed a primordial black hole dominated era, consistent with initial black hole masses of $M_i\gtrsim \mathcal{O}\left(1\right)$ kg. Detection of the gravitational waves emitted from the same primordial black holes would place intermediate-scale thermal leptogenesis under tension.

arXiv comment7+3 pages, 6 figures; one figure, comments, and references added, Boltzmann equations improved, main conclusion unchanged

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• Non-thermal Origin of Asymmetric Dark Matter from Inflaton and Primordial Black Holes
• Rescuing High-Scale Leptogenesis using Primordial Black Holes
• Evaporation of Primordial Black Holes in the Early Universe: Mass and Spin Distributions
• Distinct signatures of spinning PBH domination and evaporation: doubly peaked gravitational waves, dark relics and CMB complementarity
• ALP Dark Matter in a Primordial Black Hole Dominated Universe
• Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves
• Cogenesis of Baryon Asymmetry and Gravitational Dark Matter from Primordial Black Holes
• Gravitational wave signatures of PBH-generated baryon-dark matter coincidence
• PBH-infused seesaw origin of matter and unique gravitational waves
• Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves
• ULYSSES, Universal LeptogeneSiS Equation Solver: version 2
• Towards baryogenesis via absorption from Primordial Black Holes
• EvoEMD: cosmic evolution with an early matter-dominated era
• Dark Sector extensions of the Littlest Seesaw in the presence of Primordial Black Holes
• Primordial black holes and lepton flavor violation with scotogenic dark matter