Loop quantum cosmology in the cosmic microwave background

TL;DR

This paper explores how Loop Quantum Cosmology (LQC) can address the big bang singularity and generate inflation, proposing that future CMB polarization data could test LQC predictions about primordial gravitational waves.

Contribution

It demonstrates that LQC not only resolves the big bang singularity but also naturally leads to inflation, and suggests observational tests using CMB data.

Findings

LQC predicts specific gravitational wave signatures.

Future CMB polarization measurements can test LQC models.

LQC provides a quantum gravity framework consistent with early universe observations.

Abstract

The primordial Universe can be used as a laboratory to set constraints on quantum gravity. In the framework of Loop Quantum Cosmology, we show that such a proposal for quantum gravity not only solves for the big bang singularity issue but also naturally generates inflation. Thanks to a quantitative computation of the amount of gravity waves produced in the loopy early Universe, we show that future cosmological datas on the polarized anisotropies of the Cosmic Microwave Background can be used to probe LQC model of the Universe.