# Testing different approaches to quantum gravity with cosmology: An overview

## TL;DR

This paper reviews various quantum gravity theories and discusses how cosmological observations can be used to test or constrain these models, providing an overview of their potential empirical implications.

## Contribution

It offers a comprehensive overview of multiple quantum gravity approaches and their testability through cosmological data, highlighting the intersection of theory and observation.

## Key findings

- Different quantum gravity models can be constrained by cosmological observations
- Cosmology provides a testing ground for quantum gravity theories
- The overview clarifies how observational data impacts theoretical models

## Abstract

Among the available quantum gravity proposals, string theory, loop quantum gravity, non-commutative geometry, group field theory, causal sets, asymptotic safety, causal dynamical triangulation, emergent gravity are among the best motivated models. As an introductory summary to this special issue of Comptes Rendus Physique, I explain how those different theories can be tested or constrained by cosmological observations.