Local BRST cohomology in (non-)Lagrangian field theory

Understand

Some general theorems are established on the local BRST cohomology for not necessarily Lagrangian gauge theories.

• Particular attention is given to the BRST groups with direct physical interpretation.
• Among other things, the groups of rigid symmetries and conservation laws are shown to be still connected, though less tightly than in the Lagrangian theory.
• The connection is provided by the elements of another local BRST cohomology group whose elements are identified with Lagrange structures.