Speaker
Dr
Shinta Kasuya
(Kanagawa University)
Description
We consider the Q-ball decay and investigate the scenario that the amount of the
baryons and the gravitino dark matter is at the same time naturally explained by
the decay of the Q balls in the gauge-mediated SUSY breaking. We show the decay
rates into baryons, NLSPs, and gravitinos, and estimate their branching ratios
based on the consideration of Pauli blocking. Although the NLSPs are produced
by the Q-ball decay, the efficient annihilations of NLSPs occur afterward so that
their abundance does not spoil the successful BBN and they only produce negligible
contribution to the gravitino dark matter density from their decay. In this way, we
find that the scenario with the direct production of the gravitino dark matter from
the Q-ball decay works naturally.
Primary author
Dr
Shinta Kasuya
(Kanagawa University)
