BRST Analysis of Physical States in Two-Dimensional Black Hole
Abstract
We study the BRST cohomology for SL(2,R)/U(1) coset model, which describes an exact string black hole solution. It is shown that the physical spectrum could contain not only the extra discrete states corresponding to those in c=1 two-dimensional gravity but also many additional new states with ghost number NFP= -1 2. We also discuss characters for nonunitary representations and the relation of our results to other approaches.
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