Extra States in c < 1 String Theory
A construction of elements of the BRS cohomology of ghost number ±1 in c < 1 string theory is described, and their two-point function computed on the sphere. The construction makes precise the relation between these extra states and null vectors. The physical states of ghost number +1 are found to be exact forms with respect to a “conjugate” BRS operator.
KeywordsMinimal Model Critical String Null Vector Verma Module Liouville Theory
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