Super-Inflation, Non-Singular Bounce, and Low Multipoles

TL;DR

This paper proposes that non-singular bouncing cosmologies naturally lead to a super-inflation phase before normal inflation, which could explain the suppression of low multipoles in the cosmic microwave background, constrained by Planck data.

Contribution

It introduces a simple argument linking bouncing cosmologies to super-inflation and constrains its duration using observational data.

Findings

Super-inflation can precede standard inflation in bouncing models.

Planck data constrains super-inflation to about 3 e-folds.

Super-inflation may explain low multipole suppression in CMB.

Abstract

In this paper we present a simple argument that shows a non-singular bouncing cosmology naturally yields an era of super-inflation which can precede the phase of normal potential driven inflation. One of the consequences of a super-inflation phase is that it might be able to account for suppressing the low multipole in the amplitude of the cosmic microwave background radiation. We are able to constrain the number of e-folds of super-inflation from the current Planck data to be roughly 3 e-folds in a model independent way.