Loop Quantum Cosmology: A cosmological theory with a view

TL;DR

Loop Quantum Cosmology applies Loop Quantum Gravity principles to cosmological models, offering new insights into early universe phenomena, including singularity avoidance via a Big Bounce and mechanisms favoring inflation.

Contribution

This paper introduces Loop Quantum Cosmology, summarizes key results in homogeneous models, and discusses extending the framework to inhomogeneous scenarios.

Findings

Avoidance of Big Bang singularity with a Big Bounce

Mechanisms that favor cosmic inflation

Extension of models to inhomogeneous settings

Abstract

Loop Quantum Gravity is a background independent, nonperturbative approach to the quantization of General Relativity. Its application to models of interest in cosmology and astrophysics, known as Loop Quantum Cosmology, has led to new and exciting views of the gravitational phenomena that took place in the early universe, or that occur in spacetime regions where Einstein's theory predicts singularities. We provide a brief introduction to the bases of Loop Quantum Cosmology and summarize the most important results obtained in homogeneous scenarios. These results include a mechanism to avoid the cosmological Big Bang singularity and replace it with a Big Bounce, as well as the existence of processes which favor inflation. We also discuss the extension of the frame of Loop Quantum Cosmology to inhomogeneous settings.