On the Noether character of higher local conserved quantities for some two-dimensional models

In the case of two-dimensional conformal-invariant field-theoretical models, it is shown that the higher conserved energy-momentum tensors are of a Noether character. They are generated from generalized nonlinear translations. There are also found nonlinear gauge transformations which give higher local conserved charges. For some of these transformations, the corresponding infinite Lie algebras are investigated.