| Abstract: |
I will present a dynamical cosmologic solution that simultaneously explains the flatness of the universe via low-scale inflation and the supersymmetric little hierarchy problem via the relaxion mechanism. The inflationary potential arises from the D-term of a new U(1) gauge symmetry with a Fayet-Iliopolous term. For a U(1) gauge coupling g~ 10^{-12}, this naturally allows for a low Hubble scale of inflation, H_I <10^3 GeV, which is consistent with Planck data. This feature is then used to realize a supersymmetric two-fi eld relaxion mechanism, where the second field is identified as the inflaton. The inflaton controls the relaxion barrier height allowing the relaxion to evolve in the early Universe and scan the supersymmetric soft masses. After electroweak symmetry is broken, the relaxion settles at a local supersymmetry-breaking minimum with arange of F-term values that can naturally explain supersymmetric soft mass scales up to 10^6 GeV. |
