New Improved Generator Applied to Conformal Lagrangians
Stephen A. Longo · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 1971
Using the calculus of variations, a general expression for a conserved generator is obtained which includes the usual Noether form but with additional freedom. This freedom allows one to write geometric generators which depend only on the coordinate variation and not on the total field variation. The resultant energy-momentum tensor is then the tensor proposed by Callan, Coleman, and Jackiw. Also, a general condition is derived under which a generator can be expressed in terms of the coordinate variation only.