Inflation as de Sitter instability

TL;DR

This paper introduces a class of hilltop inflation models based on a two-exponential scalar potential, which align with recent observational data and predict inflation at energy scales significantly below the Planck scale.

Contribution

It presents the most general hilltop inflation model with a two-exponential potential and explores its holographic and cosmological implications.

Findings

Model fits recent observational data on primordial perturbations.

Predicts inflation at energy scales 10^4 to 10^5 below Planck scale.

Inflaton mass is 10^7 to 10^8 times smaller than Planck mass.

Abstract

We consider cosmological inflation generated by a scalar field slowly rolling off from a de Sitter maximum of its potential. The models belong to the class of hilltop models and represent the most general model of this kind in which the scalar potential can be written as the sum of two exponentials. The minimally coupled Einstein-scalar gravity theory obtained in this way is the cosmological version of a two-scale generalization of known holographic models, allowing for solitonic solutions interpolating between an AdS spacetime in the infrared and scaling solutions in the ultraviolet. We then investigate cosmological inflation in the slow-roll approximation. Our model reproduces correctly, for a wide range of its parameters, the most recent experimental data for the power spectrum of primordial perturbations. Moreover, it predicts inflation at energy scales of four to five orders of magnitude below the Planck scale. At the onset of inflation, the mass of the tachyonic excitation, i.e. of the inflaton, turns out to be seven to eight orders of magnitude smaller than the Planck mass.