KEK Theory Seminar (Dr. Natusmi Nagata)

Start2016/11/08(Tue)11:00 AM
End2016/11/08(Tue)12:00 PM
VenueKenkyu-honkan 1F, Meeting room 1
TitleA supersymmetric two-field relaxion model
SpeakerDr. Natsumi Nagata (The University of Tokyo)


We discuss a supersymmetric version of a two-field relaxion model that naturalizes supersymmetric models with high SUSY-breaking. This exploits a relaxion mechanism that does not depend on QCD dynamics and where the relaxion potential barrier height is controlled by a second axion-like field. During the cosmological evolution, the relaxion rolls down with a nonzero value that breaks supersymmetry and scans the soft supersymmetric mass terms. Electroweak symmetry is broken after the soft masses become of order the supersymmetric Higgs mass term and causes the relaxion to stop rolling. This can explain the tuning in supersymmetric models, while preserving the QCD axion solution to the strong CP problem. We will also consider possible inflation models compatible with this framework