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Ghosts are unphysical states that arise when quantizing gauge theories. Do not use this tag for 'ghosts' in the paranormal sense.

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Clarification on "central charge equals number of degrees of freedom"

The situation for the ghosts is different. Please see the Bowick-Rajeev refence above. Their contribution to the central charge is equal to the curvature of the canonical bundle. …
David Bar Moshe's user avatar