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Composite asymmetric dark matter assisted by primordial black holes evaporation

Takumi Kuwahara1,2 and Yoshiki Uchida3,4,5

  • 1Center for Theoretical Physics and College of Physics, Jilin University, Changchun 130012, China
  • 2Center for High Energy Physics, Peking University, Beijing 100871, China
  • 3Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan, Hubei 430079, China
  • 4State Key Laboratory of Nuclear Physics and Technology, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • 5Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Nuclear Science, Guangzhou 510006, China

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Phys. Rev. D 114, 055033 – Published 18 September, 2026

DOI: https://doi.org/10.1103/yljw-51bf

Abstract

We investigate a cogenesis scenario for composite asymmetric dark matter framework: a dark sector has a similar strong dynamics to quantum chromodynamics in the standard model, and the dark-sector counterpart of baryons is the dark matter candidate. The Hawking evaporation of primordial black holes plays the role of a source of heavy scalar particles whose CP-violating decay into quarks and dark quarks provides particle-antiparticle asymmetries in baryons and dark matter, respectively. Primordial black holes should evaporate after the electroweak phase transition and before the big-bang nucleosynthesis for explaining the baryon asymmetry of the Universe and for consistent cosmology. We find that this scenario explains the observed values for both baryon and dark matter energy densities when the heavy scalar particles have a mass of 106–109  GeV and the primordial black holes have masses of 107–109  g.

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Outline

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Phys. Rev. D 114, 055033– Published 18 September, 2026
  • Received 31 March 2026
  • Accepted 24 August 2026
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