Speaker
Dr
Kyu Jung Bae
(University of Oklahoma)
Description
Supersymmetric (SUSY) DFSZ axion model can solve both the gauge hierarchy problem and strong CP problem and explain the weak scale mu term via Kim-Nilles mechanism. It can also provide good candidates of dark matter (DM): axion and neutralino. In addition, the extended axion sector by SUSY can modify the evolution of the early universe and make non-trivial consequences. In this talk, I would like to present the impact of SUSY partners of axion: axino and saxion. The production and decay of axino and saxion modify the relic densities of the DM particles, and thus constrain the parameter space of Peccei-Quinn (PQ) symmetry breaking scale, f_a. In the scenario in which the lightest SUSY particle (LSP) is Higgsino-like neutralino, 10^10 GeV < f_a < 10^12 GeV region is allowed from all cosmological constraints. In this case, DM consists of 90% axion and 10% neutralino. In the case of Bino-like neutralino LSP, f_a>10^15 GeV region is allowed. The ratio of axion density and neutralino density varies depending on other parameters. In the last part of the talk, I will also comment on the implication of BICEP2 result.
Author
Dr
Kyu Jung Bae
(University of Oklahoma)
Co-authors
Dr
Andre Lessa
(Universidade de Sao Paulo)
Prof.
Eung Jin Chun
(Korea Institute for Advanced Study)
Mr
Hasan Serce
(University of Oklahoma)
Prof.
Howard Baer
(University of Oklahoma)