Dynamical supersymmetry breaking

Supersymmetry is one of the most plausible and theoretically motivated frameworks for extending the standard model. However, any supersymmetry in Nature must be a broken symmetry. Dynamical supersymmetry breaking (DSB) is an attractive idea for incorporating supersymmetry into a successful description of Nature. The study of DSB has recently enjoyed dramatic progress, fueled by advances in our understanding of the dynamics of supersymmetric held theories. These advances have allowed for direct analysis of DSB in strongly coupled theories, and for the discovery of new DSB theories, some of which contradict early criteria for DSB. The authors review these criteria, emphasizing recently discovered exceptions. They also describe, through many examples. Various techniques for directly establishing DSB by studying the infrared theory, including both older techniques in regions of weak coupling and new techniques in regions of strong coupling. Finally, they present a list of representative DSB models, their main properties, and the relations among them.