WARD IDENTITIES FOR AFFINE-VIRASORO CORRELATORS
WARD IDENTITIES FOR AFFINE-VIRASORO CORRELATORS
Generalizing the Knizhnik-Zamolodchikov equations, we derive a hierarchy of nonlinear Ward identities for affine-Virasoro correlators. The hierarchy follows from null states of the Knizhnik-Zamolodchikov type and the assumption of factorization, whose consistency we verify at an abstract level. Solution of the equations requires concrete factorization ansätze, which may vary over …