• Source: Supercharge

      • In theoretical physics, a supercharge is a generator of supersymmetry transformations. It is an example of the general notion of a charge in physics.
      Supercharge, denoted by the symbol Q, is an operator which transforms bosons into fermions, and vice versa. Since the supercharge operator changes a particle with spin one-half to a particle with spin one or zero, the supercharge itself is a spinor that carries one half unit of spin.
      Depending on the context, supercharges may also be called Grassmann variables or Grassmann directions; they are generators of the exterior algebra of anti-commuting numbers, the Grassmann numbers. All these various usages are essentially synonymous; they refer to the





      Z


      2




      {\displaystyle \mathbb {Z} _{2}}

      grading between bosons and fermions, or equivalently, the grading between c-numbers and a-numbers. Calling it a charge emphasizes the notion of a symmetry at work.


      Commutation


      Supercharge is described by the super-Poincaré algebra.
      Supercharge commutes with the Hamiltonian operator:

      [ Q , H ] = 0
      So does its adjoint.


      See also


      R-symmetry


      References

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