Strongly Coupled Inflaton

TL;DR

This paper explores the unique properties of a strongly coupled inflaton model using AdS/CFT correspondence, highlighting differences from traditional inflationary theories, including non-Gaussianities and fine-tuning issues.

Contribution

It extends previous work on strongly coupled inflaton models, providing new insights into their distinct inflationary dynamics and observational signatures.

Findings

Inflaton velocity is decoupled from potential shape.

Fine-tuning shifts from potential to infrared geometry.

Large non-Gaussianities can naturally occur.

Abstract

We continue to investigate properties of the strongly coupled inflaton in a setup introduced in arXiv:0807.3191 through the AdS/CFT correspondence. These properties are qualitatively different from those in conventional inflationary models. For example, in slow-roll inflation, the inflaton velocity is not determined by the shape of potential; the fine-tuning problem concerns the dual infrared geometry instead of the potential; the non-Gaussianities such as the local form can naturally become large.