Ghost-Free Spectrum of a Quantum String in SL(2,R) Curved Spacetime

Abstract

The unitarity problem in curved spacetime is solved for the string described by the SL(2,R) WZW model. The spectrum is computed exactly and demonstratedto be ghost-free. The new features include (i) SL(2,R) left/right symmetrycurrents that have logarithmic cuts on the world sheet but that satisfy theusual local operator products or commutation rules, (ii) physical statesconsistent with the monodromy condition of closed strings despite thelogarithmic singularity in the currents, and (iii) a new free boson realization for these currents which render the SL(2,R) WZW model completely solvable.

LaTeX, revtex, 2-column, 15 pages. Revised 11/4/94, minor corrections and references added

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• A New Class of Exact Solutions in String Theory
• Exactly solvable string models of curved space-time backgrounds
• Extremal black holes as exact string solutions
• Folded Strings in Curved Spacetime

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