Bound on largest r ≲ 0.1 from sub-Planckian excursions of inflaton

摘要: In this paper we will discuss the range of large tensor to scalar ratio, r, obtainable from a sub-Planckian excursion single, slow roll driven inflaton field. order obtain r for such scenario one has depart monotonic evolution parameters in way that still satisfies all current constraints \texttt{Planck}, as amplitude, tilt power spectrum, running and close pivot scale. Since evolve non-monotonically, also consider spectrum on smallest scales, i.e. at s(k ~ 1016 Mpc−1) 10−2, make sure amplitude does not become too large. All these tend keep 0.1. We scan three different kinds potential supersymmetric flat directions benchmark points which satisfy constraints. show it is possible go beyond 0.1 provided relax upper bound scales.