Resonant Reconciliation of Convex Models and the Planck. (arXiv:1903.05120v1 [astro-ph.CO])

<a href="http://arxiv.org/find/astro-ph/1/au:+Abolhasani_A/0/1/0/all/0/1">Ali Akbar Abolhasani</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sheikh_Jabbari_M/0/1/0/all/0/1">M. M. Sheikh-Jabbari</a>

We consider single field chaotic inflationary models plus a cosine modulation

term, as in axion monodromy models, and augment it by a light scalar field with

similar cosine coupling. We show the power spectrum of curvature perturbations

of this model is dominated by the one-loop contribution to inflaton two-point

function which is enhanced due to resonant interactions. This allows to

disentangle the scale of scalar and tensor perturbations and hence to suppress

the ratio of tensor-to-scalar power spectra and alters the expression of scalar

spectral tilt from the simple chaotic models, thus opening the way to reconcile

chaotic models with convex potential and the Planck data. As in monodromy

inflation models, we also have a cosine modulation in spectral tilt. We mention

that contribution of resonance effects on non-Gaussianty is small and it

remains within the current bounds. Resonant production of light particles

toward the end of inflation may set the stage for a successful reheating model.

We consider single field chaotic inflationary models plus a cosine modulation

term, as in axion monodromy models, and augment it by a light scalar field with

similar cosine coupling. We show the power spectrum of curvature perturbations

of this model is dominated by the one-loop contribution to inflaton two-point

function which is enhanced due to resonant interactions. This allows to

disentangle the scale of scalar and tensor perturbations and hence to suppress

the ratio of tensor-to-scalar power spectra and alters the expression of scalar

spectral tilt from the simple chaotic models, thus opening the way to reconcile

chaotic models with convex potential and the Planck data. As in monodromy

inflation models, we also have a cosine modulation in spectral tilt. We mention

that contribution of resonance effects on non-Gaussianty is small and it

remains within the current bounds. Resonant production of light particles

toward the end of inflation may set the stage for a successful reheating model.

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