Marginally Eternal Inflation

TL;DR

This paper investigates the fine-tuning required to achieve marginally eternal inflation within a supergravity framework, using R-invariant chaotic inflation as a case study.

Contribution

It demonstrates that slow-roll inflation can be made marginally eternal through specific parameter tuning in supergravity models.

Findings

Primordial inflation can be marginally eternal with appropriate tuning.

R-invariant chaotic inflation serves as an example of one-parameter tuning.

The study highlights the role of supergravity in inflationary model tuning.

Abstract

We examine the amount of parameter tuning to make slow-roll inflation marginally eternal by considering an R-invariant chaotic inflation as an example of one-parameter tuning in supergravity. The primordial inflation turns out to be possibly marginal in such a setup.