Ghost fields (BRST formalism)

Layer 1 — Physicsin the Classical Field Theory subtree

Anticommuting scalar Grassmann fields (Faddeev–Popov ghosts, c, c̄) introduced to make gauge-fixed path integrals unitary. BRST charge nilpotency Q²=0 enforces gauge symmetry.

Related concepts

Action principle (field theory)
Cohomology H^n(X)
Faddeev–Popov procedure

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