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.
- Big bang nucleosynthesis
- Cosmology of theories beyond the SM
- Dark matter
- Physics of the early universe
ASJC Scopus subject areas
- Astronomy and Astrophysics