Double field inflation of generalized dilaton–axion models with a new Fayet–Iliopoulos (FI) term

Abstract

We study the inflation dynamics of generalized dilaton–axion models with a new Fayet–Iliopoulos (FI) term, where both real and imaginary parts of the ‘dilaton–axion’ super-field evolve. We find that the turn rate per Hubble parameter is about to while the square of effective mass of entropic perturbation is about . These results can be used for identifying the specific inflation pattern in the future observation.