Entropy production by Q-ball decay for diluting long-lived charged particles
arXiv:0709.2634 · doi:10.1088/1475-7516/2007/11/019
Abstract
The cosmic abundance of a long-lived charged particle such as a stau is tightly constrained by the catalyzed big bang nucleosynthesis. One of the ways to evade the constraints is to dilute those particles by a huge entropy production. We evaluate the dilution factor in a case that non-relativistic matter dominates the energy density of the universe and decays with large entropy production. We find that large Q balls can do the job, which is naturally produced in the gauge-mediated supersymmetry breaking scenario.
8 pages, 1 figure
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