Axino dark matter and baryon number from Q_ball decay

18th International Symposium on Particles Strings and Cosmology

Kasuya, Shinta^1 ; Kawakami, Etsuko^2 ; Kawasaki, Masahiro^2,3

Department of Information Sciences, Kanagawa University, Kanagawa 259-1293, Japan^1

Institute for Cosmic Ray Research, University of Tokyo, Chiba 277-8582, Japan^2

Institute for the Physics and Mathematics of the Universe, University of Tokyo, Chiba 277-8582, Japan^3

关键词: Baryon asymmetry;    Baryon number;    Big bang nucleosynthesis;    Dark matter;    Gauge mediated supersymmetry breaking;    Minimal supersymmetric standard models;    Model parameters;    Q-balls;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/485/1/012025/pdf
DOI  :  10.1088/1742-6596/485/1/012025

来源: IOP

【 摘 要 】

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 for the baryon asymmetry and the dark matter of the universe simultaneously. The Q ball decays well before the big bang nucleosynthesis so that it is not affected by the decay. The decay into the supersymmetric particles of the minimal supersymmetric standard model is kinematically prohibited until the very end of the decay, and we could safely make their abundances small enough for the successful big bang nucleosynthesis. We show the regions of axino model parameters which realize this scenario.