The Quantum Superstring as a WZNW Model

  title={The Quantum Superstring as a WZNW Model},
  author={Pietro Antonio Grassi and Giuseppe Policastro and Peter R. van Nieuwenhuizen},
We present a new development in our approach to the covariant quantization of superstrings in 10 dimensions which is based on a gauged WZNW model. The WZNW action reduces to our earlier free-field quantum action after a field redefinition, and to the GreenSchwarz classical action after constraining the current in Berkovits’ BRST charge to vanish. Physical states form the cohomology of a BRST charge Q, with vanishing grading and invariant under a dual charge ∮