Cyclic universe from Loop Quantum Gravity

TL;DR

This paper presents a cyclic universe model derived from Loop Quantum Gravity, highlighting quantum corrections that induce bounces at both small and large scales, offering a novel cosmological scenario.

Contribution

It introduces a cyclic universe model from Loop Quantum Gravity with dual bounces, expanding the understanding of quantum effects at different energy densities.

Findings

Quantum gravity corrections are relevant at sub-Planckian densities.

The model features a lower bounce at small scale factors.

An upper bounce occurs at large scale factors.

Abstract

We discuss how a cyclic model for the flat universe can be constructively derived from Loop Quantum Gravity. This model has a lower bounce, at small values of the scale factor, which shares many similarities with that of Loop Quantum Cosmology. We find that quantum gravity corrections can be also relevant at energy densities much smaller than the Planckian one and that they can induce an upper bounce at large values of the scale factor.