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Results tagged with ghosts
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user 5603
Ghosts are unphysical states that arise when quantizing gauge theories. Do not use this tag for 'ghosts' in the paranormal sense.
16
votes
Accepted
Is ghost-number a physical reality/observable?
The mystery here should disappear once one realizes that the BRST complex -- being a dg-algebra -- is the formal dual to a space , namely to the "homotopically reduced" phase space.
For ordinary alg …
- 13.9k
3
votes
Accepted
How do we know that renormalization doesn't change the form of the ghost action in Yang-Mill...
The ghost sector is indeed subject to renormalization, too. What keeps it consistent is the compatibility of renormalization with the BRST symmetry which encodes the relation between the ghost sector …
- 13.9k