Primordial Entropy Production and Lambda-driven Inflation from Quantum Einstein Gravity

TL;DR

This paper discusses how Quantum Einstein Gravity (QEG) can explain the universe's entropy and induce inflation without classical inflaton fields, using renormalization group improved cosmology models.

Contribution

It demonstrates that QEG effects can account for the universe's entropy and generate inflation purely from quantum phenomena, without additional classical fields.

Findings

QEG effects can explain the universe's entropy in the massless sector.

QEG induces a quantum-driven inflationary phase.

Inflation occurs without classical inflaton fields.

Abstract

We review recent work on renormalization group (RG) improved cosmologies based upon a RG trajectory of Quantum Einstein Gravity (QEG) with realistic parameter values. In particular we argue that QEG effects can account for the entire entropy of the present Universe in the massless sector and give rise to a phase of inflationary expansion. This phase is a pure quantum effect and requires no classical inflaton field.