Axino dark matter and baryon number asymmetry production by the Q-ball decay in gauge mediation

TL;DR

This paper explores how Q-ball decay in gauge-mediated supersymmetry breaking can produce axino dark matter and baryon asymmetry, ensuring decay occurs before nucleosynthesis.

Contribution

It presents a new scenario where Q-ball decay accounts for both dark matter and baryon asymmetry without conflicting with nucleosynthesis constraints.

Findings

Q-ball decay can produce sufficient axino dark matter

Decay occurs before big bang nucleosynthesis

Parameter space for viable scenarios identified

Abstract

We investigate the Q-ball decay into the axino dark matter in the gauge-mediated supersymmetry breaking. In our scenario, the Q ball decays mainly into nucleons and partially into axinos to account respectively for the baryon asymmetry and the dark matter of the universe. The Q ball decays well before the big bang nucleosynthesis so that it is not affected by the decay. We show the region of the parameters which realizes this scenario.