supersymmetry

Introduction/purpose: supersymmetry is a symmetry of the lagrangian that goes beyond lie groups. it allows the exchange of bosons and fermions. the most important model is the minimal supersymmetric standard model, or mssm. methods: supercharge algebra, superfields, grassmann numbers, berezin integral. results: supersymmetric transformations are global, they do not depend on spacetime coordinates. in the case of supergravity, they are local. conclusion: supersymmetric models, and mssm in particular, could describe more physics and more particles beyond the standard model.