Matter-antimatter asymmetry and dark matter stability from baryon number conservation

Mar Císcar-Monsalvatje, Alejandro Ibarra, Jérôme Vandecasteele

Research output: Contribution to journalArticlepeer-review


There is currently no evidence for a baryon asymmetry in our universe. Instead, cosmological observations have only demonstrated the existence of a quark-antiquark asymmetry, which does not necessarily imply a baryon asymmetric Universe, since the baryon number of the dark sector particles is unknown. In this paper we discuss a framework where the total baryon number of the Universe is equal to zero, and where the observed quark-antiquark asymmetry arises from neutron portal interactions with a dark sector fermion N that carries baryon number. In order to render a baryon symmetric universe throughout the whole cosmological history, we introduce a complex scalar χ, with opposite baryon number and with the same initial abundance as N. Notably, due to the baryon number conservation, χ is absolutely stable and could have an abundance today equal to the observed dark matter abundance. Therefore, in this simple framework, the existence of a quark-antiquark asymmetry is intimately related to the existence (and the stability) of dark matter.

Original languageEnglish
Article number028
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
StatePublished - 1 Jan 2024


  • baryon asymmetry
  • dark matter experiments
  • dark matter theory
  • physics of the early universe


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