The Emergent Universe: An Explicit Construction

TL;DR

This paper presents a simple, singularity-free cosmological model where the universe begins in a static state, then smoothly transitions into inflation and standard Big Bang evolution, aligning with current observations.

Contribution

It provides an explicit construction of an emergent universe model with a scalar field, avoiding initial singularities and compatible with observational data.

Findings

Universe starts from a static state avoiding quantum gravity issues

Model naturally transitions into inflation and hot Big Bang phases

Consistent with current cosmological observations

Abstract

We provide a realisation of a singularity-free inflationary universe in the form of a simple cosmological model dominated at early times by a single minimally coupled scalar field with a physically based potential. The universe starts asymptotically from an initial Einstein static state, which may be large enough to avoid the quantum gravity regime. It enters an expanding phase that leads to inflation followed by reheating and a standard hot Big Bang evolution. We discuss the basic characteristics of this Emergent model and show that none is at odds with current observations.