Observable Quantum Loop Effects in the Sky

Understand

Expanding on [1], we analyze in detail the single field chaotic inflationary models plus a cosine modulation term, augmented by a light scalar field with inflaton dependent oscillatory mass term.

• We work out in detail the Feynman diagrams and compute one, two and in general estimate higher loop two and three point functions in the in-in formulation.
• We explicitly establish how the oscillatory mass term can amplify one-loop effects to dominate over the tree as well as the higher loop contributions.
• The power spectrum of curvature perturbations of this model is hence enhanced compared to the simple single field chaotic model.