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Comments on the gauge fixed BRST cohomology and the quantum Noether method

par Barnich, Glenn ;Hurth, Tobias;Skenderis, Kostas
Référence Physics Letters B, 588, 1-2, page (111-118)
Publication Publié, 2004-03-12

Article révisé par les pairs

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Résumé :

We discuss in detail the relation between the gauge fixed and gauge invariant BRST cohomology. We showed previously that in certain gauges some cohomology classes of the gauge-fixed BRST differential do not correspond to gauge invariant observables. We now show that in addition "accidental" conserved currents may appear. These correspond one-to-one to observables that become trivial in this gauge. We explicitly show how the gauge-fixed BRST cohomology appears in the context of the quantum Noether method. © 2004 Elsevier B.V. All rights reserved.