Exact Supersymmetric String Solutions in Curved Gravitational Backgrounds

Abstract

We construct a new class of exact and stable superstring solutions based on $N=4$ superconformal world-sheet symmetry. In a subclass of these, the full spectrum of string excitations is derived in a modular-invariant way. In the weak curvature limit, our solutions describe a target space with non-trivial metric and topology, and generalize the previously known (semi) wormhole. The effective field theory limit is identified in certain cases, with solutions of the $N=4$ and $N=8$ extended gauged supergravities, in which the number of space-time supersymmetries is reduced by a factor of 2 because of the presence of non-trivial dilaton, gravitational and/or gauge backgrounds. In the context of string theory, our solutions correspond to stable non-critical superstrings in the strong coupling region; the super-Liouville field couples to a unitary matter system with central charge $5\le {\hat{c}}_M\le 9$.

37 pages, CERN-TH.7148/94 Additional comments were added concerning the ${\hat{c}}_M=5$ super-Liouville theory

References in corpus (1)

• String Propagation in Gravitational Wave Backgrounds

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