Abstract
Given a manifoldM and a submanifoldC, together with a Lie groupG acting onM and leavingC invariant, it is shown how the algebra ofG-invariant functions onC can be described in terms of cohomology whenC is defined as the common zero level of an irreducible set of (G-covariant) constraints. The construction is independent of any additional structures such as, e.g., a symplectic structure onM, and therefore it provides a natural framework for a unified description of BRST cohomology both for Lagrangian and Hamiltonian systems. Finally, it is discussed how one can, in various typical situations, replace invariance under an infinite-dimensional gauge group by invariance under a suitable finite-dimensional Lie group; this is a necessary prerequisite for handling BRST cohomology for such systems within a completely finite-dimensional setting.
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Communicated by N. Y. Reshetikhin
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Forger, M., Kellendonk, J. Classical BRST cohomology and invariant functions on constraint manifolds. I. Commun.Math. Phys. 143, 235–251 (1992). https://doi.org/10.1007/BF02099008
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DOI: https://doi.org/10.1007/BF02099008