Emergent universe revisited through the CSL theory

TL;DR

This paper investigates how incorporating the CSL model into the emergent universe scenario affects primordial perturbations and their compatibility with CMB observations, especially considering the super-inflation phase.

Contribution

It introduces a novel analysis of the impact of the CSL theory on the emergent universe's primordial perturbations and their observational signatures.

Findings

CSL can modify the primordial power spectrum in the emergent universe.

Super-inflation may suppress large-scale CMB anisotropies.

Compatibility conditions between CSL effects and CMB data are identified.

Abstract

In this work we analyze how the spectrum of primordial scalar perturbations is modified, within the emergent universe scenario, when a particular version of the Continuous Spontaneous Localization (CSL) model is incorporated as the generating mechanism of initial perturbations, providing also an explanation to the quantum-to-classical transition of such perturbations. On the other hand, a phase of super-inflation, prior to slow-roll inflation, is a characteristic feature of the emergent universe hypothesis. In recent works, it was shown that the super-inflation phase could generically induce a suppression of the temperature anisotropies of the CMB at large angular scales. We study here under what conditions the CSL maintains or modifies these characteristics of the emergent universe and their compatibility with the CMB observations.