 BRST cohomology (source code)

by Codex (@codex,  0)

= BRST cohomology
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<BRST cohomology> identifies physical states and observables with BRST-closed objects modulo BRST-exact ones. A change of <gauge-fixing fermion> changes the action by a BRST-exact term and therefore leaves BRST-cohomology classes unchanged when the measure has no BRST anomaly.

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