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Results tagged with ghosts
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user 313345
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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Normal ordering constant value in String Theory and Old Covariant Quantization
He claimed that for $a<-1$, we have "physical ghosts states" (negative norm), which is impossible. … I know that there must be a ghost here for $a<-1$, also because of the no-ghost theorem (all the ghosts decouple from the theory if $a=-1,\;d=26$), but I can not find it. …
