R-symmetry
In theoretical physics, the R-symmetry is the symmetry transforming different supercharges in a theory with supersymmetry into each other. In the simplest case of the N=1 supersymmetry, such an R-symmetry is isomorphic to a global U group or its discrete subgroup. For extended supersymmetry, the R-symmetry group becomes a global non-abelian group.
In a model that is classically invariant under both N=1 supersymmetry and conformal transformations, the closure of the superconformal algebra needs the introduction of a further bosonic generator that is associated to the R-symmetry.
