Entropy production by Q-ball decay for diluting long-lived charged particles

Shinta Kasuya, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


The cosmic abundance of a long-lived charged particle such as a stau is tightly constrained by catalyzed big bang nucleosynthesis. One of the ways to evade the constraints is to dilute these particles with a huge entropy production. We evaluate the dilution factor in a case where non-relativistic matter dominates the energy density of the universe and decays with large entropy production. We find that large Q balls can fulfill this role; they are naturally produced in the gauge-mediated supersymmetry breaking scenario.

Original languageEnglish
Article number019
JournalJournal of Cosmology and Astroparticle Physics
Issue number11
Publication statusPublished - 2007 Nov 1
Externally publishedYes


  • Big bang nucleosynthesis
  • Cosmology of theories beyond the SM
  • Dark matter
  • Physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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