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Résumé |
String theory is rich in symmetries. For a closed bosonic string the massless
states such as graviton antisymmetric tensor field are endowed with local
symmetries. Therefore, the S-matrix associated with these stringy states satisfy
Ward Identities.
I shall discuss how these Ward Identities an be generated by implementing suitable
canonical
transformation in the Hamiltonian path integral approach for the worldsheet
theory. For compactified theories, nonabelian gauge bosons appear. We shall show
how corresponding WI appear. These are on shell Ward identities. We shall discuss
possibilities of deriving off shell Ward identities. |
