Quantum smearing in hybrid inflation with chaotic potentials

We study the impact of 1-loop radiative corrections in a nonsupersymmetric model of hybrid inflation (HI) with chaotic (polynomial-like) potential, V0 + λpϕp. These corrections can arise from the possible couplings of inflaton with other fields which can play an active role in the reheating process. The tree-level predictions of these models are shown to lie outside of the Planck’s latest bounds on the scalar spectral index ns and the tensor to scalar ratio r. However, the radiatively corrected version of these models, V0 + λpϕp + Aϕ4ln ϕ, is fully consistent with the Planck’s data. More specifically, fermionic radiative correction (A < 0) reduces the tensor to scalar ratio significantly and a red-tilted spectral index ns < 1, consistent with Planck’s data, is obtained even for sub-Planckian field-values.