Ultracold chemistry as a testbed for few-body physics

Ultracold atoms, molecules and ions provide a unique playground to explore chemistry at ultracold temperatures. In this Review, we discuss what makes these systems particularly appealing as controlled quantum systems and the theoretical challenges that their study poses. We discuss recent progress in the field, focusing on chemical processes such as bimolecular chemical reactions, three-body recombination, charge transfer reactions and photochemistry. We emphasize the synergy between theory and experiment, highlighting the predictive power of theory and future directions in ultracold chemistry research.