Flaton Inflation Model
We propose an inflation model which is constructed by two “flatons”. In this model, one of flatons causes inflation. However, it is not the inflaton but the other flaton which generates density perturbations for structure formation. The spectral index of these perturbations n is controlled by the ratio of the mass squared of these flatons, Mχ/Mσ, and n ≃ 0.6 − 0.98 for Mχ/Mσ ≃ 0.62 − 0.75. This model realizes a “tilted inflation” structure formation scenario and is cosmologically interesting. Although the inflaton belongs to so called moduli, this can be diluted by the decay of the other flaton. Submitted to Phys. Lett. B. E-mail: umeda@umich.edu